Internet History Technology Security Quiz Answer. In this post you will get Quiz Answer Of Internet History Technology Security
Internet History Technology Security Quiz
Offered By ”University of Michigan”
Week- 1
History: Dawn of Electronic Computing
1.
Question 1
What was the Lorenz Machine used to transmit?
1 point
- Long strategic messages with lots of detail
- Attack plans between the British and Russian generals
- Intelligence between the American and British forces
- News stories from Germany to the soldiers at the front so they would feel more connected to family and friends back home
2.
Question 2
Who is John Forbes Nash and what is he known for?
1 point
- An actor in the movie A Beautiful Mind
- The creator of the internet
- A famous spy during World War II
- A mathematician and founder of modern day Game Theory
3.
Question 3
What did the Polish Cipher Bureau give to the British?
1 point
- A German Geheimschreiber
- A Polish dessert called the Bomba
- Access to the Polish telephone network data transmissions
- A technique for breaking encoded German Enigma messages
4.
Question 4
Why was the Enigma machine so important to the German strategy during World-War II?
1 point
- Encrypted wireless communication allowed for a very fast and yet coordinated approach to war
- Because Germany wanted to challenge the British to see who could build the first electronic computer
- Because Germany’s enemies would be distracted if they believed all the mis-information in the communication
- Because it was the quickest way to insure that as many people as possible would be exposed to propaganda messages.
5.
Question 5
What is a Modem used for?
1 point
- Use a voice-based phone line to transmit data
- Decrypt coded German war time transmissions
- Insure that transmissions to submarines work even when they are deep under water
- Record encrypted data from wireless transmissions for later decryption.
- Retransmit lost packets so as to insure the overall reliability of Internet connections
6.
Question 6
What kind of parts were used to make the Colossus electronic computer?
1 point
- Hardware that was in common use in telephone switching stations
- All of the parts were made of wood because of a shortage of silicon to make computer chips
- Microprocessors and random access memory
- A gas turbine that drove an air compressor
7.
Question 7
What are leased lines?
1 point
- Secure lines used to connect British cryptographers to British military command
- The modern lines we connect to the internet through
- Dedicated telephone lines organizations paid telecom companies monthly to have continuous access to
8.
Question 8
About how many vacuum valves/tubes were there in the Colossus?
1 point
- 12
- 2500
- 10000
- 150
9.
Question 9
On the Colossus computer what was used to store and repeatedly read the encrypted message text?
1 point
- Strips of film
- A spinning magnetic disk drive that was read like a tape
- A paper tape that was read using light sensitive tubes
- A solid-state flash drive (i.e. a USB stick)
10.
Question 10
What made Bletchley park successful?
1 point
- The information provided by the Polish Cipher Bureau
- Their huge team dedicated to the purpose of decryption
- The unlimited budget available to them
- All of the above
11.
Question 11
Who did the Enigma machine belong to?
1 point
- The Norwegians
- The British
- The Polish
- The Germans
12.
Question 12
Who created the functional design of the Bombe mechanical computer use to crack Enigma codes at Bletchley Park?
1 point
- Alan Turing and Gordon Welchman
- Max Newman and William (Bill) Tutte
- Alistair Dennison and Tommy Flowers
13.
Question 13
Where is Bletchley Park located?
1 point
- Sydney, Australia
- New Mexico, United States
- Glasgow, Scotland
- Buckinghamshire, England
Week- 2
History: The First Internet – NSFNet
1.
Question 1
What was the primary reason for the development of store and forward networks by the academic community?
1 point
There were no leased lines available in the US
The phone company refused to provide leased lines to the academic community
Universities were willing to tolerate delay in order to keep the cost of long-distance data communication low
Wireless communications like 4G were much slower than the leased copper wires from the phone company
1.
Question 1
What was the primary reason for the development of store and forward networks by the academic community?
1 point
Due to a imited number of installed copper wires, transfer with leased lines was expensive
There were no leased lines available in the US
Leased lines were only available to businesses like banks
Wireless communications like 4G were much slower than the leased copper wires from the phone company
2.
Question 2
What is the relationship between the number of hops on the store and forward network, and the time taken for a message to be delivered?
1 point
More hops within the network usually result in a longer delivery time
The number of hops don’t matter because more hops means less traffic per hop
More hops in the network decrease delivery time
For each new hop in the network the delivery time always doubles
3.
Question 3
What were the primary motivations for the Department of Defense to develop the research network ARPANET?
1 point
To improve computing equipment for military purposes, making it easier for people to access computers, and communicate more effectively across the military.
Cisco was using the ARPANET to test the performance and reliability of its early products in the 1970’s and 1980’s
They knew that if they built the ARPANET during the 1970’s it would lay the groundwork for massive economic growth in the later 1990’s
There was a desire to make sure consumer hand-held devices would continue to function in case of nuclear war
4.
Question 4
What was the fundamental difference between the store and forward network of BITNET, and ARPANET?
1 point
The use of computer terminals
ARPANET was essentially a store-and-forward network for the U.S. Military
Packet switching
The use of leased lines from the telephone company
5.
Question 5
In the shared network, the role of the router is:
1 point
To store data when a network link went down
To store all of the possible routes between a pair of connected computers
To reassemble packets into the original message
To quickly forward packets to the next router
6.
Question 6
What are the advantages of packet switching?
1 point
Many messages can be in-flight at the same time, preventing large messages from blocking small ones
Packet switching slows all messages down to the speed of the slowest message
Packet switching makes sure every packet takes exactly the same path from the source computer to the destination computer
There is no major advantage and the decision to do packet switching was politically motivated
7.
Question 7
Why did the National Science Foundation decide to build a national shared network?
1 point
Cisco wanted someone to develop and test router technology so they could build a business around network hardware
It was very expensive to give each university its own supercomputer. A national shared network was more affordable.
Universities had extensive on-campus networks and needed a way to connect those networks together.
Politicians put pressure on the National Science Foundation to build a national shared network
8.
Question 8
Larry Smarr was one of many instrumental players in creating the first national network. What do we learn from his interview?
1 point
From the first moment that NSFNet was turned on, Google was the most popular application
That high performance computing needs at universities and the Internet were deeply connected
Telephone companies were very supportive of NSFNet.
Access to shared library resources (journals etc) were the primary motivator of the NSFNet
9.
Question 9
Why did the University of Michigan not participate in the ARPANET research project?
1 point
Michigan had its own state-wide network, consisting of 3 nodes
When Michigan first connected to ARPANET they crashed the network, and so were permanently removed from the project
No states starting with the letter ‘M’ were included
Michigan had its own state-wide network, consisting of 10 nodes
10.
Question 10
In the late 1980s, how did the first average citizens get Internet access?
1 point
First the ‘academic-only’ rules were quietly ignored and then later the ‘academic-only’ rules were removed completely
Average citizens could purchase Internet access commercially
Some citizens hacked into the network
ARPANET became the first Internet Service Provider (ISP) and sold access to the NSFNet
11.
Question 11
What was the primary difference between the University of Michigan proposal to build the NSFNet, and the other proposals?
1 point
The University of Michigan’s midwest location meant that the connections to the rest of the nodes on the NSF were cheaper.
The University of Michigan used leased lines from the telephone company. Other proposals used long-distance wireless communications to build the network.
The University of Michigan proposal proposed a 1.54 Mbit network with planned upgrades to much higher speeds throughout the life of the project
The University of Michigan proposal included a search engine. The other proposals only had a directory-style lookup of Web resources.
Week- 3
History: The Web Makes it Easy to Use
1.
Question 1
What was a common goal that the various innovators we’ve heard from were trying to achieve?
1 point
Make sure that their country was the only country with and effective communications infrastructure
Commercialize their innovations as quickly as possible before anyone came up with a better idea
Improve communication between people all across the world
Protect their ideas using patents so they would have an edge over other application developers
2.
Question 2
What did Robert Caillau see as a major strength of his web editor and browser as opposed to Gopher and ultimately Mosaic?
1 point
Each time you clicked a link the entire page replaced the previous page in the same window
It was much easier to install
It allowed for the development of graphically rich games
It handled links as connections as opposed to ‘ugly’ URLs
2.
Question 2
What did Robert Caillau see as a major strength of his web editor and browser as opposed to Gopher and ultimately Mosaic?
1 / 1 point
Each time you clicked a link the entire page replaced the previous page in the same window
It was much easier to install
It allowed for the development of graphically rich games
It opened each element in a new window
3.
Question 3
What does HTTP stand for?
1 point
Hyper Text Transfer Protocol
Helpful Text Typing Pattern
Haptic Type Transmit Pattern
4.
Question 4
In 1994-1995, Microsoft saw the Internet as such an important piece of the future that they devoted how many people to developing support for the Internet and Web into Windows-95?
1 point
2000
500
10000
5000
5.
Question 5
What best describes Robert Caillau’s vision for the World Wide Web?
1 point
A tool that would allow people to shop, connect with family and friends, and produce public logs of their daily lives
An interface that would allow academics to collaboratively create, edit, and view documentation, seeing each different type of material (maps, images, text, etc.) in its own particular individual window.
A system through which academics could discover research relevant to their field
6.
Question 6
Which of the following best describe how people used the web server developed by Paul Kunz?
1 point
As an early site to meet and converse with people around the world
As an early source of high-quality content
As a site to buy and sell items via auctions
As a bulletin board system where people discussed programming techniques for NeXT computers
7.
Question 7
What piece of technology had to be created for the web to be successful in 1994?
1 point
Wearable virtual reality glasses
Printers that could be used over wireless networks
Video cameras to allow low-cost video calls around the world
A protocol that allowed for the retrieval of documents stored on network-attached servers
8.
Question 8
During what time period was Gopher more popular than the Web?
1 point
Gopher was never more popular than the web
1990-1993
1994-1997
1980-1985
9.
Question 9
What is the markup language invented by Tim Berners-Lee and Robert Cailliau to represent web documents.
1 point
HTML
JSON
XML
Python
10.
Question 10
What problems were the team trying to develop NCSA Mosaic trying to solve? (check all that apply)
1 point
Teaching beginning Computer Science students how to develop web services
Creating a browser where all content popped up in a new window
Creating a browser that would let people view documents stored on the web
Creating a web browser that was easy to install
11.
Question 11
Who did Paul Kunz describe the modern implementation of the internet as being a “win-win” solution for? (Choose all that apply)
1 point
The Web is a win for telephone companies as it gives them a monopoly over long distance communications
The Web is a win for companies because it helps them reaching their target audience more directly
The Web is a win for everyday people as it allows them to do complex product comparisons effectively
12.
Question 12
Which of the following is true?
1 point
BITNet was a packet-switched network
Packet switched networks were widely used in higher-education before store-and-forward networks were deployed
One way of reducing cost on a store-and-forward network was to add another school geographically in-between two connected schools
When a link goes down in a store-and-forward network, data is re-routed in less than a second so users barely notice the outage
13.
Question 13
What did Steve Jobs contribute to the creation of the Internet?
1 point
He made sure that the first web browser from CERN was very easy to install and use by bundling it into the iPad
While in college, he created the browser that would ultimately be instrumental in making the Internet available to everyone.
He was responsible for the company that created the NeXT machine – and on which much of the most earliest development of the Internet was done.
He gave CERN a grant to write the software for the world-wide web.
He invented a new business model for music that ultimate created the need for the world-wide-web and Internet
14.
Question 14
Which of the following is not true about the CERN high-energy physics lab?
1 point
CERN has an annual music festival each summer called the Hardronic Festival
CERN has a need to communicate with scientists working at universities around the world
Many of the experiments at CERN take 10 or 20 years to build before they can be used to gather data
In 1987, they decided that inventing the Web was more important than studying Physics
15.
Question 15
In what year can we clearly say the World Wide Web took off?
1 point
1998
1988
1994
1991
16.
Question 16
What makes Switzerland an ideal location to house a multi-national collaborative research facility like CERN?
1 point
The beautiful and inspiring scenery
The fantastic food available to feed these brilliant minds
Switzerland’s longstanding neutrality allows scientists from all over the world to travel there more easily than other nations.
The flat landscape allows for the construction of large above-ground particle accelerators
17.
Question 17
What kinds of atmospheres do we consistently see as providing the right support to allow fantastic innovation to happen?
1 point
Top-down organizations that emphasize specific goals and standards, and refuse to allow their research to be distracted by new discoveries.
Organizations that support and encourage creativity in all forms – including music, art, and the pursuit of extensive side projects.
Organizations that offer financial bonuses to employees that produce innovations that transform society.
Government-run projects that use statistical approaches to process improvement reducing the average number of defects in each innovation.
Week- 4
History: Commercialization and Growth
1.
Question 1
What institution agreed to be responsible for web standards in 1994?
1 point
Stanford
Request-Response Congress (RRC)
HTML Standards Organization (HSO)
University of Michigan
CERN
World-Wide-Web Consortium (W3C)
Cascading Style Sheets (CSS)
2.
Question 2
Between 1990 and 2006 the number of servers connected to the web grew from what to what?
1 point
3 servers to 100 thousand servers
1 server to 120 million servers
1 server to 1 billion servers
2 servers to 500 million servers
3.
Question 3
What browser did Netscape ultimately turn into?
1 point
Chrome
Safari
Internet Explorer
Firefox
4.
Question 4
How did the Mozilla foundation earn their money?
1 point
They charged end-users an upgrade fee to go from the free version of streaming video to the pro version
They had several Class A IP addresses which they split up and auctioned them and sold them to the highest bidder.
They added a search bar to their browser, and Google paid for the traffic directed to them.
They received a $10 million dollar endowment from Warren Buffet
5.
Question 5
What web technology does Brendan Eich include as part of creating the capabilities we refer to as HTML5?
1 point
Visual Basic
Ruby on Rails
CSS
PHP
6.
Question 6
Why did JavaScript never fail in the beginning, as most new programming languages do?
1 point
It was written by a team of 1000 computer scientists.
It was carefully crafted over the course of several years before being released.
It was written by someone who had prior experience constructing a language, and knew what pitfalls to avoid in creating the initial product.
They convened a conference with 100 computer scientists and had everyone vote on what features to include.
7.
Question 7
What was Mitchell Baker “fired” from Netscape for?
1 point
Because she added several badly-designed tags (like blink) to HTML without approval
For repeatedly giving priority to the needs of the open source community over the needs of the commercial version of Netscape.
For making the Netscape browser display a disrespectful pop-up message whenever it was viewing www.aol.com
For giving trade secrets to Microsoft
8.
Question 8
What was Tim Berners Lee’s goal with establishing web standards?
1 point
To insure that Netscape would be able to control the future directions of the web
To prevent the proprietary Balkanization of the web
To make sure the CERN browser was the only browser in the marketplace
To make sure that Facebook would be held accountable for their privacy policies
8.
Question 8
What was Tim Berners Lee’s goal with establishing web standards?
0 / 1 point
To make sure that all TCP/IP implementations used an appropriate retransmit timeout
To have total control over how programming for the web was done
To make sure that a single company could not determine the technical direction of the web
To make sure that all web browsers were also editors
9.
Question 9
Why did Jeff Bezos choose to start Amazon.com by selling books?
1 point
Books are the category of items that have the most different products, making it impossible to have a brick and mortar store with the same level of inventory.
Because Apple’s iTunes store had already cornered the market for music tracks
Because the ISBN number allowed each book to be broken into packets and routed across the network for remote printing
Books were the easiest item to track because of their ISBN catalogue numbers.
Books were the easiest category of items to ship.
Week- 5
Technology: Internets and Packets
1.
Question 1
Common Link Layer technologies are… (Choose all that apply)
1 point
Ethernet
Smartphones
Cable Modem
iPods
1.
Question 1
Common Link Layer technologies are… (Choose all that apply)
0 / 1 point
VCRs
HDTVs
Cable Modem
DSL
2.
Question 2
When do wireless devices receive their serial numbers (i.e. MAC or Ethernet addresses)?
1 point
When they are manufactured
Every time they connect to the internet
These numbers are assigned to individual people, and every device they own has the same number
When they pair with a wireless router
3.
Question 3
What does the time taken for a packet to reach a destination usually reflect?
1 point
How large the total message or data element is
The type of data the packet makes up
How much the individual user sending the information has paid for their internet connection
The speed of light and the distance the packet has to travel
4.
Question 4
How do wireless devices operating on a shared network determine when to send information so as not to incur chaos?
1 point
There is only one link to the network, and only one wireless device can connect at a time, so they are physically prevented from sending information unless it is their turn.
They listen to the sound on the current network, and send information when it is quiet.
They send requests to all other devices on the network, and wait to receive permission before transmitting data.
They chart energy usage, and send information when the numbers are low
5.
Question 5
What is the concern when deciding which device sends information next on Ethernet?
1 point
Discouraging the sending of large messages by delaying their transmission in favor of smaller, faster messages
Ensuring fairness – that one type of device, data, or user is not preferred over others.
Prioritizing the customers who purchase premium internet plans
Sending the most urgent emails before less important messages (like Farmville notifications)
6.
Question 6
What is the maximum possible number of hops a packet can take to try to reach their destination (the so-called “Time To Live” functionality of packets)?
1 point
255
4
150
500
7.
Question 7
What are Router Tables?
1 point
Huge banks of routers, housed by Google, that direct Internet traffic
An electrically enhanced table that, when you place a router on it, will increase your network speed
Dynamic lists of directions for where and how to direct packets
A linked trio of routers that manages incoming, outgoing, and within-network data transmissions.
8.
Question 8
What are the layers, and in what order do we structure them?
1 point
Link Layer
Map Layer
Social Media Layer
Application Layer
Transport Layer
Packet Layer
Visual Layer
Link Layer
Application Layer
Transport Layer
Internetwork Layer
Link Layer
Internetwork Layer
Application Layer
Link Layer
Transport Layer
9.
Question 9
What is the Internet Protocol Layer responsible for?
1 point
Managing the order of data transmission from multiple computers on a wireless network
Being 100% reliable
Getting a packet to a specific network address
Moving the packet onto the link
10.
Question 10
How is an IP address determined?
1 point
According to product manufacturing date
Geographically
By the date in which the owner first got an email account
By the hour in which the computer was most recently turned on
11.
Question 11
The prefix of an IP address determines what?
1 point
The brand of computer
The owner of the computer
The default web browser installed
The network that it belongs to
12.
Question 12
What is the Link Layer responsible for?
1 point
Deciding on the next link that a packet should be sent on once it is inside of a router
Assigning domain names like www.coursera.org
Storing each packet until it has been acknowledged for delivery
One single hop
12.
Question 12
What is the Link Layer responsible for?
0 / 1 point
Reporting which packets successfully arrived at their destination
Deciding on the next link that a packet should be sent on once it is inside of a router
Assigning domain names like www.coursera.org
Pulling the data from a single link
13.
Question 13
Is it possible to track a packet’s journey across the network?
1 point
Yes, using a technique called ‘traceroute’ which tracks the packets that are returned due to transmission failure.
Yes, using RIP (Router Information Protocol) which tracks the packets that successfully arrive at their destination.
No, packets cannot be tracked.
Yes, using a service called ‘packetfind’ that tracks the transmission of all packets across the Internet.
Week- 6
Technology: Transport Control Protocol (TCP)
1.
Question 1
What part of data transfer does TCP solve, and what part does IP solve?
1 point
The interface via which a user sends data, and the reliability of data transmissions
The actual movement of the data, and the reliability of data transmissions
The reliability of data transmissions, and the security of the data.
The reliability of data transmissions, and the actual movement of the data
2.
Question 2
What is window size in regards packet transfer?
1 point
The amount of data that can be sent before receiving an acknowledgement
The maximum number of packets belonging to an email or file uploaded to the internet
The size of the interface window a user sees on the screen and sends packets through
The range of hours during the day that low-speed data is free on the Internet
3.
Question 3
What was the problem that Van Jacobson experienced and worked to solve?
1 point
Having his secure data stolen during transmission
Extremely slow transmission of data when two fast internal networks were connected via a slow network.
Getting messages intended for other people
Receiving partial and indecipherable sets of postcards in the mail
4.
Question 4
The storage of unacknowledged data is whose responsibility?
1 point
The person sending the data
The application layer of the sending computer
The transport layer of the sending computer
The link layer of the receiving computer
Routers
5.
Question 5
How did Van Jacobson change TCP so that it would work properly?
1 point
He changed the receiving computer to acknowledge data that had not yet been received
He changed the sending computer to start sending data slowly and speed up as the data was acknowledged
He changed the sending computer to send all of its data to the first router before any packets were sent across the slow link
He changed routers to compress data when sending it across slow links.
6.
Question 6
What do we learn from the four layer TCP about how to solve complex problems?
1 point
Generally all software works best when it is broken into quarters with 1/4 of the problem assigned to equal sized teams.
Applications like word processors need a Link and Transport layer
Break things up into smaller pieces, and allow many different people and organizations to tackle each piece indvidually.
Complex architecture diagrams help sell products to non-technical management staff
7.
Question 7
If you listened closely to the Bob Metcalfe video, he mentioned that Ethernet was designed after the early ARPANET had been designed and knowing how ARPANET would work allowed him to greatly simplify the design of Ethernet. What problem did the first implementation of Ethernet at PARC assume would be solved at a higher level of the network architecture.
1 point
How to detect if electrical interference on the ethernet cable caused the data in a packet to be corrupted
Retransmitting lost or damaged packets
What address would be assigned to each device order to share the Ethernet cable
How to deal with two computers attempting to start transmitting data at exactly the same time and corrupting each other’s data
8.
Question 8
When we talk of the protocols that move data over the Internet, we talk of TCP/IP. Which of the following is FALSE about TCP/IP:
1 point
TCP will retransmit data if it is lost in the Internet
TCP demands that data be stored in the sending computer until it is acknowledged
IP makes use of TCP as its underlying transport mechanism
TCP is a stream of bytes
9.
Question 9
In TCP, when does a sending system know it is safe to discard packets after it has sent them?
1 point
As soon as the sending computer has in IP address that came from DHCP
After the packet has successfully made it across the first hop
After it has received an acknowledgement from the receiving system.
As soon as the packet has a properly assigned IP address
10.
Question 10
If you wanted to register the domain dr-chuck.go.com – who would you contact?
1 point
The owner of dr-chuck.com
The IETF (Internet Engineering Task Force)
The owner of go.com
Jon Postel – Because he was the “numbers guy” in the ARPANET
11.
Question 11
Which of the following is a domain name?
1 point
www.umich.edu
00:1f:5b:81:62:e7
(734) 615-2000
192.168.0.12
11.
Question 11
When looking at addresses from most general to most specific, we read IP addresses ________ and we read domain addresses _________. (fill in the blanks)
1 point
left to right, right to left
top to bottom, bottom to top
right to left, left to right
right to left, right to left
Week- 7
Technology: Application Protocols
1.
Question 1
What does the Application Layer expect from the Transport Layer?
1 point
The Transport layer dynamically transports IP addresses to all of the computers connected to a Wifi Network.
A reliable pipe that delivers data from another application across the Internet
The Transport Layer tells the Application Layer the geographic location of all of the routers in the Internet
The Application sends a Domain name through the Transport Layer and gets back an IP Address
The Transport Layer accurately predicts the number of hops it will take to go across the country.
2.
Question 2
If you were “hacking” the Hypertext Transport Protocol using the ‘telnet’ command, what command would you send to the web server once you are connected to retrieve a document?
1 point
DNLD/DOC
GET
DOCU-RETR
RETR
3.
Question 3
Which of the following are examples of applications in the application layer? (Choose all that apply)
1 point
Chrome web browser
WiFi
Internet Explorer
Ethernet Port
Central Processing Unit
3.
Question 3
Which of the following are examples of applications in the application layer? (Choose all that apply)
1 point
WiFi
Ethernet Port
Slow Start
Apple Mail
Instant Messaging Client
3.
Question 3
Which of the following are examples of applications in the application layer? (Choose all that apply)
1 point
Chrome web browser
Microsoft Outlook
Ethernet port
Fiber Optic
Router
4.
Question 4
When is the Internet 100% up and working?
1 point
At midnight GMT, every day all routers reboot and the Internet is 100% up for about ten minutes
Once a year the Internet is completely rebooted and stays at 100% for about ten minutes
It never is. It is constantly having pieces connect, fail, disconnect, reboot, etc.
When more than 2% of the Internet goes down, all routers simultaneously reboot to get back to 100%
5.
Question 5
Last time! What are the layers of the internet, and the order in which we structure them?
1 point
* Application
* Router
* Link
* IP
* Port
* Transport
* Application
* Link
* Application
* Transport
* IP
* Link
* User
* Application
* Link
* Router
6.
Question 6
What does the browser do when you click a Hypertext Link from your current web page to another web page?
1 point
It does a relational database look up in the IMDB
It does a Request-Response Cycle
It connects to port 23 and sends the “DATA” command
It looks at its most recent RSS feed for the Domain Name Service and selects a Network Number
7.
Question 7
What does port 23 do?
1 point
IMAP
HTTP
Telnet (Login)
YouTube
8.
Question 8
What does port 80 do?
1 point
HTTP
SMTP
POP
Telnet (login)
9.
Question 9
RFCs are:
1 point
The standards defining protocols on the Internet
Curated by Paul Kunz at the Stanford Linear Accelerator (SLAC)
Papers written by Physicists at CERN about Radio Frequency Colliders
Issued by the United Nations (UN)
10.
Question 10
Which of the following is most like a TCP/IP port number:
1 point
Telephone extension
Zip Code
Highway number
Telephone area code
11.
Question 11
What is a protocol?
1 point
A program used to scan for vulnerable ports on a network-connected computer
A technique for obscuring security algorithms
A technique routers use to predict the traffic distribution over a long time period
A set of rules that govern how different components of the Internet interact with each other
Week- 8
Security : Encrypting and Signing
1.
Question 1
Which of the following is true of security?
1 point
Perfect security is achievable and cheap
Perfect security is unachievable and requires a trade-off with cost
Perfect security is unachievable but you should always choose the most expensive option
Perfect security is achievable but expensive
2.
Question 2
What is the difference between active and passive wiretapping?
1 point
In passive wiretapping only some of the network data is altered where in active wiretapping all of the network data is altered
Passive wiretapping and active wiretapping are different names for network snooping
In active wiretapping the network is snooped whereas in passive wiretapping the network is altered
In passive wiretapping the network is snooped whereas in active wiretapping the network data is altered
3.
Question 3
Integrity is preserved if
1 point
Information you receive is from who you think it is
The information you receive has not been corrupted since it was sent no matter who sent it
The information you receive is probably from who you think it is and has not been modified since it was sent
The information you receive is from who you think it is and has not been modified since it was sent
4.
Question 4
Which of the following factors has the smallest effect on the strength of a cryptosystem?
1 point
The key distribution technique
The encryption algorithm
The key length
The data being transmitted
5.
Question 5
What is one possible advantage of public-key cryptosystems over secret-key ones?
1 point
Public-key cryptosystems do not have the problem of secure key distribution
Public-key cryptosystems are always more secure than secret-key ones
Public-key cryptosystems can transmit more data than secret-key ones
6.
Question 6
What does it mean if a cryptosystem is symmetric-key in nature?
1 point
The key used for encryption is a shortened version of the key used for decryption
The key used for encryption is the backward version of the key used for decryption
The key used for encryption is the from the key used for decryption but with a shared secret added to the end
The key used for encryption is the same as the key used for decryption
7.
Question 7
The following question is encrypted using a Caesar Cipher with a shift of 13. You can use www.rot13.com to decrypt the question.
Jub vf perqvgrq nf orvat bar bs gur vairagbef bs Rgurearg?
1 point
Bob Metcalfe
Mitchell Baker
Vint Cerf
Tim Berners-Lee
8.
Question 8
The following question is encrypted using a Caesar Cipher with a shift of 13. You can use www.rot13.com to decrypt the question and answers.
Jung qbrf gur Gjvggre unfugnt #VUGF fgnaq sbe?
1 point
Vagrearg Uvfgbel, Grpuabybtl, naq Frphevgl
Vagreaangvbany Uvtu Grpuabybtl Fheirl
Vagreany Uvtu Grpuabybtl Fbyhgvba
Vaqvtb, Uraan, Gnatrevar naq Fhasybjre
9.
Question 9
What is the SHA-1 hash of the string below as computed by http://www.dr-chuck.com/sha1.php
The Transport Layer does retransmission
1 point
7024bcb8830521399edc7e55f7be8dbc7722e179
7e55f7be8dbc7024bcb8830527722e1791399edc
1399edc7e55f7be8dbc7024bcb8830527722e179
22e1791399edc7e55f7be8dbc7024
10.
Question 10
What does a cryptographic hash function do?
1 point
It computes the Hyperbolic Asymmetric Sine Harmonic (H.A.S.H.) for a sequence of audio data
It takes a block of data and randomly changes characters to numbers
It converts input fixed-size bit strings into blocks of data
It takes a block of data and returns a fixed-size bit string called the hash value
11.
Question 11
What critical element does simple digest-based Message Signing, as described in the lecture, depend upon?
1 point
The message must be under 20 characters long
The secret should not be longer than the message
The sharing of a secret transported securely ‘out of band’
The geographic proximity of the transmitter and recipient of the message
12.
Question 12
What is the problem with secret key distribution via the internet?
1 point
The communication of the secret key is insecure
The internet is too slow for sending keys
There is no problem
The internet cannot handle the length of shared secret keys because they are longer than a single packet
13.
Question 13
You are going to send the message below using shared secret of IHTS. Use http://www.dr-chuck.com/sha1.php to compute your message digest using the technique from lecture. What will the first six characters of the digest/signature that you send along with the message?
Be sure to drink more Ovaltine
1 point
44dbc4
2b5473
e1c85e
8b4258
14.
Question 14
Select the valid signed message from Annie if your shared secret is IHTS? Use http://www.dr-chuck.com/sha1.php to compute your message digests using the technique from lecture. Only the first 6 characters of the SHA1 message digest are shown below.
1 point
Meet me at the train station87fd2e
Bring me cookies51be4e
Send money please7d47f3d4
It is raining5e4421
14.
Question 14
Select the valid signed message from Annie if your shared secret is IHTS? Use http://www.dr-chuck.com/sha1.php to compute your message digests using the technique from lecture. Only the first 6 characters of the SHA1 message digest are shown below.
0 / 1 point
Meet me at the train station87fd2e
Send money please7d47f3d4
Bring me cookies51be4e
I have not been kidnapped by pirates32f4d3
14.
Question 14
Select the valid signed message from Annie if your shared secret is IHTS? Use http://www.dr-chuck.com/sha1.php to compute your message digests using the technique from lecture. Only the first 6 characters of the SHA1 message digest are shown below.
1 / 1 point
Everything is all right7dd244
Meet me at the train station87fd2e
It is raining5e4421
Send money please7d47f3d4
Week- 9
Security: Web Security
1.
Question 1
Which of the following is false about the two keys used in public key encryption?
1 point
The public key alone is used for encryption and the private key alone is used for decryption
The public key is openly revealed while the private key must be kept secret
If you have the public key it is easy to compute the private key
One key is public and the other is private
2.
Question 2
When you are using secure http and sending data between your computer and your bank’s computer, where is the data encrypted and decrypted?
1 point
Encrypted in your network card and decrypted by the bank’s Internet Service Provider (ISP)
Encrypted in your bank’s computer before they store the data in a database
Encrypted and decrypted each time your message passes through a router
Encrypted in your computer and decrypted in the bank’s computer
3.
Question 3
In regards to security, what do we assume about the Internet?
1 point
That no one can view Internet traffic without a subpoena
That neither the routers nor the links between the routers are secure
No one should ever send sensitive information like Credit Card numbers over the Internet
That the entire Internet is completely secure other than WiFi connections
4.
Question 4
This week we’ve updated our model of how we communicate information via the internet to add in a fifth mini-layer to the structure in order to protect the confidentiality of transmissions. What is the new list of layers and in what order do we list them?
1 point
* Application
* TCP
* IP
* Packet Encryption
* Link
* Application
* Secure Sockets
* TCP
* IP
* Link
* ZIP+Secure
* Application
* TCP
* IP
* Link
* Application
* TCP
* IP
* Link
* Dark Fiber
5.
Question 5
What is packet sniffing?
1 point
When a router looks at the first part of packet to to the routing lookup before the entire packet is received
When we use detection equipment to see if link speeds are being exceeded
When a receiving system anticipates a packet before it is received and pre-sends the acknowledgement to save time
Computers watching packets being transmitted across the network in hopes of finding important or valuable data
6.
Question 6
Which of the following is FALSE about using secure sockets (i.e. https) to send sensitive information like a credit card across the Internet?
1 point
When using an unsecured WiFi, your data is still protected because of https
It requires large amounts of computing power to decrypt your data
It is impossible to decrypt your data
It requires complex math to decrypt your data
7.
Question 7
Which of the following is NOT a major threat to your data when using secure sockets?
1 point
Someone may see your public key
You can be unknowingly redirected to a server different from the one you would like
There may be a virus on your computer monitoring your keystrokes
8.
Question 8
Which of the following is not an equivalent name to ‘digital certificate’?
1 point
Identity certificate
Digital certificate
Private key certificate
Public key certificate
9.
Question 9
What is a digital certificate?
1 point
An electronic document used to give a public key an identity
An electronic document used to give a private key an identity
A real-life document used to certify the security of your computer
An electronic document used to give both public and private keys an identity
10.
Question 10
What is a certificate authority?
1 point
An entity that tries to ensure secure transactions by attempting to crack encrypted messages online
An entity that certifies the ownership of a public key by the named subject of the certificate
An entity that certifies that you have no virus on your computer
An entity that certifies the mathematical relationship between the public and private keys of a system
11.
Question 11
Which of the following is NOT an indicator of the effectiveness of Verisign as a certificate authority?
1 point
Verisign goes to great lengths to store their private keys securely
Verisign has a high success rate for maintaining secure transactions
Verisign publishes its private keys on a little-known web site only available to key owners
Verisign is used by major manufacturers like Apple and Microsoft
12.
Question 12
How does your computer typically know the public key of a certificate authority during secure communications?
1 point
The public key is stored in the operating system by the manufacturer before you buy or install it
The computer doesn’t use a public key
The public key is emailed to the computer the first time you switch it on
The public key has to be downloaded when you are setting up the computer’s web browser
Week- 10
Final Exam – IHTS
1.
Question 1
How did the top-secret computing technologies developed at Bletchley Park during World-War II impact computing technology after the war:
1 point
The plans for the computers at Bletchley Park were inadvertently leaked onto the Internet
The computer scientists used their knowledge of electronic computers to build the first generation of general purpose computers
All of the computing equipment was shipped to CERN where is was stored underground beneath the border between Switzerland and France
All the equipment at Bletchley Park was given to University College London(UCL) as part of a grant
One of the computer scientists at Bletchley Park anonymously wrote a tell-all book that described secret technologies in great detail
2.
Question 2
What did Alan Turing contribute to Computer Science?
1 point
He founded the field of Artificial Intelligence
He developed the slow-start algorithm for TCP
He developed the Domain Name System that looks up IP addresses
He helped design the IEEE 802.11 protocols that we now know as “WiFi”
He designed the first object-oriented programming language
3.
Question 3
What was the primary reason the Colossus computer was faster than the BOMBE computer?
1 point
The Colossus computer sharded its databases across multiple servers to improve throughput
The Colossus added cache memory to speed up instruction fetch
The Colossus computer used vacuum tubes instead or gears and relays
The Colossus computer submerged its bearings in oil to allow it to spin four times faster
The Colossus computer used Flash RAM rather than spinning disk drives
4.
Question 4
Which of the following was the greatest weakness of store-and-forward networks like BITNET?
1 point
Since it made extensive use of WiFi, it experienced significant outages due to weather
Because messages were broken into small pieces and sent individually, buffer overflow caused too many retransmissions
Every new university that was added cost a lot of money because everyone needed a direct connection to the new university
IP addresses were geographical in nature but extremely difficult for users to keep track of
If your message was behind a large message it would have to wait until the large message was completed before it was sent.
5.
Question 5
Which of the following is most like a “packet” on the Internet?
1 point
A three-ring binder
The intersection of two roads
A cell phone antenna
A postcard
A restaurant
6.
Question 6
What was the original “stated” intention of the National Science Foundation Network (NSFNet)?
1 point
To provide a communications infrastructure for the World-Wide-Web
To increase the speed of E-Mail between universities
To allow universities to switch to IP telephony to save per-office charges
To connect scientists to supercomputers
To increase the demand for telephone company services
7.
Question 7
Given the original five-year and 15 million dollar budget of the National Science Foundation Network (NSFNet), what was the expected speed of the national NSFNet backbone?
1 point
56 thousand bits per second
45 million bits per second
1 billion bits per second
1.5 million bits per second
3 billion bits per second
8.
Question 8
Which of the following is the best explanation as to why the web was invented at CERN?
1 point
CERN was in possession of all of the top-secret communications equipment from Bletchley Park
At a 1985 IETF meeting in Columbus, Ohio the delegates agreed that CERN should invent the web
The French government passed a law that all documents needed to be online by 1993
Being in Switzerland ensured that the project managers paid very close attention to detail
Well-funded smart people in a culture that was open and fun
9.
Question 9
Which of the following is something that Robert Cailliau and Tim Berners-Lee did not do?
1 point
Invented the Hypertext Markup Language (HTML)
Invented the first HTML editor
Invented the first web browser
Invented the first object-oriented language (WWW++)
Invented the Hypertext Transport Protocol (HTTP)
10.
Question 10
Where was the first web server in America in production on December 12, 1991?
1 point
Harvard University
University of Michigan
Princeton University
Stanford Linear Accelerator (SLAC)
National Center for Supercomputing Applications (NCSA) at University of Illinois
11.
Question 11
What protocol was commonly used during 1990-1993 to organize and find information on the Internet that did not use the world-wide-web protocols?
1 point
RTSP
Altavista
Yahoo!
Wikipedia
Gopher
12.
Question 12
Which of the following products could be thought of as the “early ancestor of the Mozilla Firefox browser”?
1 point
Internet Explorer
Cello
NCSA Mosaic
Apple Safari
Opera
13.
Question 13
Where was JavaScript developed at?
1 point
Sun Microsystems
Netscape
University of Illinois
Microsoft
14.
Question 14
What is the purpose of the World-Wide-Web Consortium?
1 point
Define standards for the web and avoid proprietary balkanization of the web
Developed privacy policies for Internet traffic that crossed international boundaries
Define protocol documents for the IP and Link layers
Act as a clearing house for open source software contributed by large corporations
Ensured that traffic between any two nodes on the Internet would never need more than 15 hops
15.
Question 15
Why was the first product sold by Amazon books?
1 point
Because there would be great demand for new technology books fueled by the growth of the Internet
Because there are over 3 million books in print
Because books were increasingly being purchased on e-readers like the Kindle
Because books are the easiest product to covert to digital form for electronic distribution
16.
Question 16
Which of the following is most similar to an Internet router?
1 point
A post card
A license plate number for an automobile
A truck
A string between two tin cans
A train station
17.
Question 17
About how many separate physical connections (i.e. hops) will a packet cross on the Internet as it goes from University of Michigan to Stanford University?
1 point
15
1
64
6
36
18.
Question 18
What is the value of a layered network model?
1 point
It makes sure that at least one layer is working so internet data never stops flowing completely
It allows for the detection of security breaches at the lower layers before they get through all the layers
It allows a complex design problem to be broken into smaller manageable parts
It insures that the Internet is capable of replacing the telephone networks around the world
It makes sure that university programmers and commercial programmers will not work on overlapping areas of the Internet
19.
Question 19
What is the IETF?
1 point
It establishes policies for the pricing for domain names around the world
It monitors traffic levels on network links that go between countries to insure that costs are evenly shared
It accumulates data packets that are lost due to congestion and returns them to the system that originally sent the data
It is a coordinating body where the standards that define the inner workings of the Internet are developed and published
It is the protocol that web browsers use to retrieve documents from web servers
20.
Question 20
Which is the lowest layer in the TCP/IP network model?
1 point
Transport
Internet
Application
Link
Proto-Application
21.
Question 21
Which of the following is a Link Layer address?
1 point
www.coursera.org
http://www.umich.edu/
192.168.0.12
2012-99-99
00:1f:5b:81:62:e7
22.
Question 22
Which of the following is *not* an attribute of the Internet (IP) Layer?
1 point
It moves data across a series of hops
It routes packets based on their network number
It is designed to recover lost packets
23.
Question 23
What is the purpose of the TTL value in an IP packet?
1 point
It ensures that a packet does not get stuck in an infinite loop in the Internet
It makes sure that we can use easy to read addresses like www.coursera.org
It records the network number of the next router that will forward the packet
It makes sure that the same packet is never sent twice
It compensates for lost packets by retransmitting them after a time period expires
24.
Question 24
Which of the following is a domain name?
1 point
00:1f:5b:81:62:e7
www.coursera.org
http://www.umich.edu/
192.168.0.12
25.
Question 25
What problem did Van Jacobson solve in TCP?
1 point
He created the domain name system to allow us to find an IP address for a domain name efficiently
He added compression to the link layer, greatly increasing throughput of the Internet
He made sure that commercial web traffic like Netflix would get higher priority than academic traffic or long file downloads
He invented the slow-start algorithm to keep systems from overloading a slow link
He added encryption so it was safe to move credit card information across the Internet
26.
Question 26
When we talk of the protocols that move data over the Internet, we talk of TCP/IP. Which of the following is FALSE about TCP/IP?
1 point
TCP will retransmit data if it is lost in the Internet
IP provides “best effort” delivery of network packets
IP makes use of TCP as its underlying transport mechanism
TCP provides reliable messaging where data arrives in order
TCP is a stream of bytes
27.
Question 27
Secure TCP (TLS) is between which two layers?
1 point
Link and Media
Transport and Internet
Router and Link
Application and Transport
Internet and Link
28.
Question 28
When you are using secure http and sending data between your computer and your bank’s computer, where is the data encrypted and decrypted?
1 point
Encrypted by your keyboard and decrypted by the disk drive in the bank’s computer
Encrypted and decrypted each time your message passes through a router
Encrypted in your computer and decrypted in the bank’s computer
Encrypted in your network card and decrypted by the bank’s Internet Service Provider (ISP)
Encrypted by your Internet Service Provider (ISP) and decrypted in the bank’s ISP
29.
Question 29
Which of the following is a TCP port (such as port 80 for HTTP) most like?
1 point
A train car
A telephone extension
A train station
A license plate number for an automobile
A country code for a telephone number
30.
Question 30
Which of the following commands is part of the Hypertext Transport Protocol (HTTP)?
1 point
RETR
PREFS
SAVE_AS
PING
GET
31.
Question 31
What is the problem with secret key distribution via the internet?
1 point
Sending secret-key data crashed early routers and so it was banned after 1978
Secret keys used a special character set that was not supported by TCP/IP
We cannot all physically visit every web site and physically pick up a key book to work securely with that site
There is no problem – you just send all the secret keys across the internet in plain text
Because secret keys were mostly numbers, they cause the Van Jacobson Algorithm to fail (slow start)
32.
Question 32
What does a cryptographic hash function do?
1 point
It breaks long messages into smaller pieces (hashes) to allow for effective sharing of a link layer
It determines the resonant frequency of digitized audio
It takes non-printable data and makes it 8-bit clean
It takes a block of data and computes a fixed-size bit string called the hash value
33.
Question 33
Which of the following is credited as one of the inventors of Public Key Cryptograhy in the 1970’s?
1 point
Whitfield Diffie
Bob Mercalfe
Mitchell Baker
Katie Hafner
34.
Question 34
Which historical figure is credited with encrypting military messages using a simple “shifted alphabet”?
1 point
Caesar
Archimedes
Plato
Nostradamus
35.
Question 35
Which of the following are the steps to sign and send a message to insure that the message came from the sender and was not modified in transit?
1 point
Compute the cryptographic hash of the secret and send the message + the hash across the internet.
Compute the cryptographic hash of the message, send the message + the hash + secret across the internet
Append the shared secret to the message, compute the cryptographic hash of the message + secret, send the message + cryptographic hash across the internet
Send the secret across the internet, receive the cryptographic hash from the other system and then send the message + cryptographic across the Internet
36.
Question 36
Which of the following statements is false
1 point
A public key can be sent across an insecure medium
Public key encryption is very difficult to break
It is not a problem if a public key is revealed to an eavesdropper
Public key encryption cannot be broken
37.
Question 37
What is the mathematical underpinnings of public key encryption?
1 point
Trignometry
Linear Algebra
Prime numbers
Turing Machines
Calculus
Venn Diagrams
38.
Question 38
Considering the four-layer TCP/IP model, which two layers does Secure Sockets Layer (SSL) fit between?
1 point
TCP and IP
Application and TCP
TCP and Link
IP and Link
39.
Question 39
If you are sending credit card information from a coffee shop WiFi to an Internet web site and later you find your credit card information has been stolen, which is the most likely scenario as to how your information was stolen?
1 point
You did not use secure HTTP (https) at a coffee shop with an open WiFi
Someone gained access to the database on the vendor’s web site and found all the credit cards
Someone gained access to all the packets passing through the Internet Service Provider used by the coffee shop
Someone guessed your credit card information by trying all possible 16-digit number sequences
40.
Question 40
Which of the following would be major a warning sign that indicates lax security practices when dealing with a site where you have an ID and Password?
1 point
They can send you a mail message with the password you previously used to log in if you forget it
They use public / private key encryption for all the web transactions
If you lose your password, you are forced to select a new password
They use Captcha (where you have to type in hard-to-read text) as part of their log in process
