思科认证考试（Cisco）CCNA考试题(2)

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11. Which of the following is not a job for the presentation layer? Choose 2
6 O0 I! K/ P5 h7 n' ~7 I% v. Q& mA. Data representation   B. Compression
C. Dialog management     D. Transmission    E. Encryption
2 }$ i) Q% a" G. U( Q1 m% G" bAnswer C D. C is handled by the session layer, and D is handled by the Transport
layer
0 S5 y- R5 Q' ^- u0 A  B8 P* d2 J12. What does Peer to Peer communication involve?
A. Each layer communication with the layer below it
B. Each layer communication with layer above it
% G3 f" o0 _9 ^6 p3 ?C. Each layer communicating with adjacent layer in another system
: H& W6 h9 Z: A& r6 O& L8 s. sD. Each layer communication with it s corresponding layer in another system
, [) _# p9 J1 C7 f1 ]) x- c$ W( [Answer D. Answer C sounds correct also, but adjacent and corresponding are two
3 f5 J) {" q* A& y% Odifferent things. The session layer can only communicate with the session layer in
1 D8 n8 V( y! l  panother system for example.
; s+ ?# v& u& A1 {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
4 Z. Y6 f, u8 MB. Design and development can be made in a modular fashion
0 w# _. j# j' w  e; }! s" v5 P0 |8 JC. Network operations can be simplified
D. Troubleshooting can be simplified.
Answer A B C D.
7 S( p% e' ?. L  P% D  ~* m14. Which two of the following are not from the physical layer?
0 S9 w0 W& j! b9 Q# |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
* j  J: p2 A  P( G  ?15. Which two answers are functions of the OSI model"s network layer?
! u4 Q8 W  Q2 ]: U0 UA. Sequencing of frames   B. Path determination
( v* |$ B1 J* s: ^5 gC. Packet switching       D. Packet sequencing
, q$ Y2 b# M; R1 N: E; s4 E/ iAnswer B C. Sequencing is done at the data link layer. D is fictional.
" |# g" F3 g+ E; o- ?) d8 Per B C. Sequencing is done at the data link layer. D is fictional.
7 `3 e1 n$ ]/ ]* N16. What is an example of a MAC address?
A. Az32:6362:2434   B. Sj:2817:8288
) e% w( z6 A; u' N+ f* kC. GGG:354:665      D. A625:cbdf:6525
0 c) F) ]4 }1 {Answer D. The address is a 48 bit address which requires 12 Hex digits. A hex digit
! E2 B9 {, W$ Q/ Jcan t be past the letter F. Hex stands for 16. 1-9 and A-F make up numbers that are
valid.
+ _, h% {8 g% y% l- @17. Which of the following is not part of the data link layer?
# f9 S+ l$ V$ y8 R0 ^A. Transports data across the physical link
B. Performs physical addressing
5 v- ~. W. T  i0 n1 ?1 \/ hC. Performs flow control
+ u$ m* R/ p' {D. Determines network topology
" r$ b* w$ A. o: @E. Terminates a session
4 e/ r3 s" c9 TAnswer E. This is part of the session layer
8 x0 O. F4 M' H# j, I18. 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.
  ?8 p# U' y5 @( ]* i' y% t19. Of the following address AA77:3827:EF54, which of the following is the vendor
portion?来源:考试网IT学院
- n! h" L+ b! ~6 j, _3 S% {' lA. AA7738   B. 27EF54   C. AA77   D. EF54
- u3 Q7 k0 s7 y# PAnswer A. The vendor code is how you can tell who made the card. The last 6 digits
are the physical address.
20. Which of the following are examples of layer 3 addressing?
A. 165.33.4.34   B. AA77:3827:EF54   C. HHHH:hg:7654   D. 76
Answer A B. The first is a TCPIP address and the second is an IPX address