2012思科认证试题及答案：CCNA经典考题分析4

1. 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

2. 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.

3. 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.

4. 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转自:考试网 - [Examw.Com]

Answer E. This is part of the session layer