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. 

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 

Answer A D E. FTP is an application and SQL is a session layer protocol. 

19. Of the following address AA77:3827:EF54, which of the following is the vendor portion? 

A. AA7738 
B. 27EF54 
C. AA77 
D. EF54 

Answer A. The vendor code is how you can tell who made the card. The last 6 digits are the physical address.

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