| Question 1 | The best compression type to use when connecting to a Microsoft client is A. Stacker B. Predictor C. MPPC D. TCP Header
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| A1: | Answer C is correct. In most cases, the best type of compression for a client using a Microsoft operating system is MPPC because most clients do not have the necessary application software to activate the other types on compression. Therefore Answers A, B, and D are not correct. MPPC is the only one that comes with the Windows operating system. |
| Question 2 | The best compression type to use with primarily Telnet traffic is A. Stacker B. Predictor C. MPPC D. TCP Header
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| A2: | Answer D is correct. You should use TCP Header compression when the TCP headers are larger than the data portion of the packet. You shouldn't use Answers A and B, Stacker and Predictor, because they will just slow down the router without a measurable increase in compression. You shouldn't use Answer C, MPPC, because a Microsoft client wasn't mentioned, and even if it had been, MPPC would give the same result as Stacker. |
| Question 3 | The best compression type to use with traffic that contains a lot of compressed data is A. Stacker B. Predictor C. MPPC D. TCP Header
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| A3: | Answer B is correct. Predictor examines packets to see whether they are already compressed and, if so, won't compress them again. This process saves a small amount of bandwidth, as well as CPU cycles on the receiving device. Answers A, C, and D don't examine packets to see whether it will be a waste of time compressing them. |
| Question 4 | Which dial-up encapsulations support compression? A. PPP B. HDLC C. Frame Relay D. SLIP
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| A4: | Answer A is correct. Answer C, Frame Relay, isn't what we would call a dial-up encapsulation type, and of the remaining choices, only Answer A, PPP, natively supports compression. |
| Question 5 | What hashing algorithms are used with CHAP? A. MD-4 B. MD-5 C. SHA D. IKE
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| A5: | Answer B is correct. When protecting a password with CHAP, the router uses MD-5 to hash the text before sending it across the WAN. MD-4 is an ancestor of both MD-5 and SHA that provides a weak hashing algorithm, whereas SHA provides greater security than MD-5 but is not used by CHAP. Internet Key Exchange (IKE) is a process used in IPSec encryption. |
| Question 6 | Which ways can CHAP send passwords? (Choose two.) |
| A6: | Answers B and C are correct. CHAP can send passwords both in plain text (not a good idea) or by using the MD5 format to create an encrypted hash. The Djikstra algorithm is used with link-state routing protocols, not authentication. Therefore, Answers A and D are not correct. |
| Question 7 | Which issues prevent a device from calling back the device that called it when using callback? (Choose two.) A. Authentication failure B. Another call being made or received that uses the last available interface C. Authentication success D. Interesting traffic arriving
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| A7: | Answers A and B are correct. Success in authenticating continues the process but doesn't prevent the return call. If interesting traffic uses the last available dial-out interface, it prevents the call, but interesting traffic itself doesn't stop the process. Authentication success normally continues the process, so Answer C is not correct. Although Answer D, interesting traffic arriving, can stop the process if it uses the last available interface, the traffic arriving doesn't necessarily cause a problem. |
| Question 8 | The command to enable Stacker compression is A. compression stac B. compression stacker C. compress stac D. compress stacker
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| A8: | Answer C is correct. You use the command compress stac to enable Stacker compression. Answers A, B, and D are just incorrect. |
| Question 9 | Which option for the command ip tcp header-compression tells the interface to compress TCP headers only if the destination device sends packets with compressed TCP headers? A. active B. passive C. receive D. transmit
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| A9: | Answer B is correct. The command ip tcp header-compression passive tells the router to compress TCP headers only if it receives a compressed header from the other device. Answers A, C, and D don't exist. |
| Question 10 | Cisco IOS uses which size headers on multilink packets? A. 2 byte B. 4 byte C. 8 byte D. 16 byte
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| A10: | Answer B is correct. The IOS uses 4-byte headers when sending packets across multilinked lines. The 700 series ISDN devices, which don't use IOS, use 2-byte headers, the specification allows for 8-byte headers, and 16-byte headers are not allowed. Therefore, Answers A, C, and D are not correct. |
