思科认证考试（Cisco）CCNA考试七十九题(2)Cisco认证考试

文章作者 100test 发表时间 2009:04:30 00:38:23
来源 100Test.Com百考试题网

11. Which of the following is not a job for the presentation layer? Choose 2

A. Data representation B. Compression
C. Dialog management D. Transmission E. Encryption

Answer C D. C is handled by the session layer, and D is handled by the Transport
layer

12. What does Peer to Peer communication involve?

A. Each layer communication with the layer below it
B. Each layer communication with layer above it
C. Each layer communicating with adjacent layer in another system
D. Each layer communication with it s corresponding layer in another system

Answer D. Answer C sounds correct also, but adjacent and corresponding are two
different things. The session layer can only communicate with the session layer in
another system for example.

13. Why does the industry use a layered model? Choose all correct

A. When you enhance one layer it doesn t affect the other layers
B. Design and development can be made in a modular fashion
C. Network operations can be simplified
D. Troubleshooting can be simplified.

Answer A B C D.

14. Which two of the following are not from the physical layer?

A. SDLC B. V.35 C. HSSI D. ISDN E. RS-232

Answer A D. SDLC and ISDN are WAN protocols that function at the data link layer

15. Which two answers are functions of the OSI model"s network layer?

A. Sequencing of frames B. Path determination
C. Packet switching D. Packet sequencing

Answer B C. Sequencing is done at the data link layer. D is fictional.

er B C. Sequencing is done at the data link layer. D is fictional.

16. What is an example of a MAC address?

A. Az32:6362:2434 B. Sj:2817:8288
C. GGG:354:665 D. A625:cbdf:6525

Answer D. The address is a 48 bit address which requires 12 Hex digits. A hex digit
can t be past the letter F. Hex stands for 16. 1-9 and A-F make up numbers that are
valid.

17. Which of the following is not part of the data link layer?

A. Transports data across the physical link
B. Performs physical addressing
C. Performs flow control
D. Determines network topology
E. Terminates a session

Answer E. This is part of the session layer

18. Which of the following are data link protocols?

A. HDLC B. FTP C. SQL D. ISDN E. Token Ring