思科认证考试CCNA考试七十九题(1)[1]

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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 B. A P S T N D PH
C. PH D N T A S P D. P S A T N D PH

Answer B. It is crucial you not only memorize this and know what each layer does.

2. What is encapsulation?

A. Putting the header on an incoming frame
B. Putting a header on an incoming segment
C. Putting a header on an outgoing frame
D. Putting a header on an outgoing bit

Answer C. This also includes trailers and can be put on segments, packets, and frames.

3. Which layer is most concerned with user applications?

A. Application B. Presentation C. Network D. Physical

Answer A.

4. Which of the following is de-encapsulation?

A. Stripping the header from a frame
B. Putting a header on a segment
C. Putting a header on a frame
D. Stripping a frame from a link

Answer A. This also includes trailers as in question 2.

5. What layer converts data into segments?

A. Application B. Presentation C. Transport D. Physical

Answer C.

6. What layer converts data into Packets?

A. Network B. Application C. Physical D. Data Link

Answer A.

7. What layer converts data into Frames?

A. Application B. Physical C. Data Link D. Transport

Answer C.

8. What layer converts data into bits?

A. Application B. Session C. Data Link D. Physical

Answer D. 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 toCisco认证