8.8 Questions-Chapter 8

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You can take this quiz online at http://www.net-intro.com/quiz/

  1. How do we indicate that we want a secure connection when using a web browser?
    a) Use https:// in the URL
    b) Use a secure web browser
    c) Open an incognito window
    d) Manually encode the address of the server using SHA1
  2. Why is a shared-secret approach not suitable for use on the Internet?
    a) Because people would lose or misplace the secret
    b) It is difficult to distribute the secrets
    c) Encryption and decryption with shared secrets are too easily
    broken
    d) Encryption and decryption with shared secrets take too
    much compute power
  3. What is the underlying mathematical concept that makes public/private key encryption secure?
    a) Continuous functions
    b) Taylor series
    c) Karnaugh Maps
    d) Prime numbers
  4. Which of the keys can be sent across the Internet in plain text without compromising security?
    a) Encryption key
    b) Decryption Key
    c) Shared Secret
    d) Univerally Safe Key (USK)
  5. Where does the Secure Sockets Layer (SSL) fit in the four-
    layer Internet architecture?
    a) Below the Link layer
    b) Between the Link and Internetworking layers
    c) Between the Internetworking and Transport layers
    d) Between the Transport and Application layers
  6. If you were properly using https in a browser over WiFi in a cafe, which of the following is the greatest risk to your losing credit card information when making an online purchase?
    a) Someone captured the packets that were sent across the WiFi
    b) Someone captured the packets in the gateway router
    c) Someone captured the packets as they passed through a core Intenet router
    d) You have a virus on your computer that is capturing keystrokes
  7. With the Secure Sockets Layer, where are packets encrypted and decrypted?
    a) They are encrypted and decrypted as they pass through the router
    b) Each physical link has its own separate encryption
    c) They are encrypted in your computer and decrypted in the server
    d) They are encrypted in the WiFi gateway and decrypted in the last router before the destination computer
  8. What changes to the IP layer were needed to make secure
    socket layer (SSL) work?
    a) No changes were needed
    b) We had to add support for Secure IP (IPSEC)
    c) We needed to support longer packets in IP
    d) The Time-To-Live (TTL) value needed to be encrypted
  9. If a rogue element was able to monitor all packets going
    through an undersea cable and you were using pub-
    lic/private key encryption properly, which of the following
    would be the most difficult for them to obtain?
    a) What servers you were communicating with
    b) How often you used the servers
    c) How much data you retrieved from the servers
    d) Which documents you retrieved from the servers
  10. What is the purpose of a Certificate Authority in public/private key encryption?
    a) To make sure people do not forge badges for learning activities
    b) To make sure packets get routed to the correct destination computer
    c) To assure us that a public key comes from the organization it claims to be from
    d) To choose when a particular country must switch from IPv4 to IPv6
  11. The ARPANET network was in operation starting in the 1960s. Secure Sockets Layer (SSL) was not invented util the 1980s. How did the ARPANET insure the security of the data on its network?
    a) By using public/private keys and encrypting all transmissions
    b) By using encryption at the Link layer
    c) By making sure no one could access the physical links
    d) By only using secure WiFi routers
  12. Which of these answers is “Security is fun” encrypted with a Caesar Cipher shift of 1.
    a) Ptsjduao rt dii
    b) Wentudhs di dju
    c) Tfdvsjuz jt gvo
    d) Asdfghjk qw zxc
  13. What Caesar Cipher shift was used to encrypt “V yvxr fr-
    phevgl”?100
    a) 1
    b) 6
    c) 13
    d) 24

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