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CiscoCCNA考试七十九题
来源：长理培训发布时间：2017-09-02 14:47:46
1.What is the correct order for
the OSI model?
P=Presentation, S=Session, D=Datalink,
Ph=Physical, T=Transport, A= Application,
N=Network
A. P S A PH D N T
C. PH D N T A S P
It is crucial you not only memorize this
and know what each layer does.
2. What is encapsulation?
B. Putting a header on an incoming segment
D. Putting a header on an outgoing bit
This also includes trailers and can be put on segments,
packets, and frames.
3. Which layer is most concerned with user applications?
B. Presentation
D. Physical
4. Which of the following is de-encapsulation?
A. Stripping the header from a frame
B. Putting a header on a segment
D. Stripping a frame from a link
This also includes trailers as in question 2.
5. What layer converts data into segments?
A. Application
B. Presentation
D. Physical
7. What layer converts data into Frames? A. Application
B. Session All of the layers need to convert data into something that they can pass down to the next level, with the exception of the Application layer which hands data to the Presentation layer. The Presentation layer encrypts, and compresses before sending it to the Session layer for it s first conversion. 9. Which layer is most concerned with getting data from the beginning to the final destination?
A. Application
6. What layer converts data into Packets?
A. Network
C. Physical
A. Application
C. Data Link
8. What layer converts data into bits?
D. Physical
C. Session
The transport layer is most concerned with reliable transportation
from one end to the other.
10. Which of the following is not a part
of the Session layer?
A. Establishing a session
B. Ensuring error free segments
D. Keeping the sender and receiver from sending a message
at the same time That is the job of the Transport layer.
11. Which of the following is not a job
for the presentation layer? Choose 2
B. Compression
D. Transmission
B. Compression
D. Transmission
C is handled by the session layer, and D is handled
by the Transport layer
12. What does Peer to Peer communication involve? another system 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 from the physical layer? Answer A D.
A. Each layer communication with the layer below it
C. Each layer communicating with adjacent layer in another system
Answer D.
D. Troubleshooting can be simplified.
14. Which two of the following are not
A. SDLC
C. HSSI
E. RS-232
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?
B. Path determination
D. Packet sequencing
B. Path determination
D. Packet sequencing
Answer B C.
Sequencing is done at the data link layer. D is fictional
责编：罗莉
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