返回首页
当前位置: 主页 > 认证考试 > Cisco认证 >

CiscoCCNA考试七十九题

时间:2014-10-20 23:30来源:电脑教程学习网 www.etwiki.cn 编辑:admin

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

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

  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


  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
  

This also includes trailers as in question 2.

  5. What layer converts data into segments?

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

  
 
  6. What layer converts data into Packets?

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

 

  7. What layer converts data into Frames?

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


  8. What layer converts data into bits?

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

  

  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
  B. Presentation
  C. Session
  D. Transport

 

  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
  C. Ending a session

  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

  A. Data representation
  B. Compression
  C. Dialog management
  D. Transmission
  E. Encryption

 

  C is handled by the session layer, and D is handled

  by the Transport layer

  12. What does Peer to Peer communication involve?

  A. Each layer communication with the layer below it
  B. Each layer communication with layer above it
  C. Each layer communicating with adjacent layer in another system
  D. Each layer communication with it s corresponding layer in

  another system

  Answer D.

  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
  C. Network operations can be simplified
  D. Troubleshooting can be simplified.

 
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.
 

顶一下
(0)
0%
踩一下
(0)
0%
标签(Tag):cisco认证考试试题
------分隔线----------------------------
------分隔线----------------------------
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片