今天做了一下chinaitlab上面的CCNA试题!

今天做了一下Chinaitlab上面的CCNA关于网络基础知识的题目,比较简单,但是也有很多错题或者很有意义的题目,把它们贴出来,让自己总结一下!

首先是一些没有理解的英文单词:

encapsulation [简明英汉词典]
包装,封装

encrypt [简明英汉词典]
v.[计] 加密,将...译成密码

adjacent [简明英汉词典]
adj.邻近的, 接近的

troubleshooting [简明英汉词典]
n.发现并修理故障, 解决纷争

SDLC [简明英汉词典]
同步数据链路控制

hex [简明英汉词典]<!--我真的很汗,这个当时没认出来…-->
n.十六进制

topology [简明英汉词典]
n.拓扑, 布局
拓扑学

haul [简明英汉词典]
n.用力拖拉, 拖, 拉, 捕获物, 努力得到的结果, (尤指)一网捕获的鱼量, 拖运距离
vi.拖, 拉, 改变方向, 改变主意
vt.拖拉, 拖运

boost [简明英汉词典]
v.推进

1.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

2.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.

3.What is an example of a MAC address?

　　A. Az32:6362:2434
　　B. Sj:2817:8288
　　C. GGG:354:665
　　D. A625:cbdf:6525

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.

4.Which of the following are data link protocols?

　　A. HDLC
　　B. FTP
　　C. SQL
　　D. ISDN
　　E. Token Ring

FTP is an application and SQL is a session layer protocol

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

　　A. AA7738
　　B. 27EF54
　　C. AA77
　　D. EF54
The vendor code is how you can tell who made the card. The last 6 digits are the physical address.

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

The first is a TCPIP address and the second is an IPX address

What layer are Bridges on?

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

Bridges segment networks but are not able to determine addresses like the network layer does.

Repeaters are on what layer?

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

All repeaters can do is boost a signal. An active hub is a good example of a repeater.

A switching hub is a good example of layer 3 addressing, since switches go by network

addresses and IPX addresses rather than just boost signals. Bridges can only read mac

addresses, and not the full IPX or TCPIP addresses.

Which of the following are considered routing protocols?

A. OSPF
B. IP
C. IPX
D. EIGRP
E. Token Ring

Answers B and C are routed protocols, whereas A and D are the protocols that do the routing. This is easily confused. You can remember it by thinking that the routing protocols that haul the routed protocols are like a tug ship pulling a barge. The barge is full of data.

routed protocol: 可路由协议，如TCP/IP, IPX/SPX, AppleTalk
routing protocol, 路由协议，如RIP, OSPF, EIGRP, BGP

Which two of the following are considered connection oriented communication?

A. Setup and maintenance procedures are performed to ensure message delievery
B. A physical circuit exists between two communicating devices
C. It is a best effort type of communication
D. A virtual connection exists between the two

B is not a necessity, and C is not accurate. TCP is connection oriented

and UDP is not.

Which of the following are not WAN protocols? Choose 2

A. Frame Relay
B. ATM
C. Ethernet
D. FDDI
E. ISDN

Ethernet and FDDI are LAN protocols.