计算机网络（中英文）—百一测评在线考试系统

题库描述

中文试题

题库结构

技能

题目数

占比(%)

C1计算机网络与因特网

C1_Internet_English

C2应用层

C4网络层

C5链路层_English

C2应用层英文en

C5链路层

C3运输层English

C4en

其它

题型

题目数

占比(%)

单选题

104

多选题

不定项选择题

问答题

判断题

104

填空题

多选问答题

组合题

1 [ 判断题 ] (分) C3运输层English 中

The TCP segment has a field in its header for rwnd(RevWindow).

A
```
true
```
B
```
false
```

2 [ 单选题 ] (分) C4en 中

Which of the following is not Internet routing protocol?

A
```
RIP
```
B
```
ICMP
```
C
```
OSPF
```
D
```
BGP
```

3 [ 判断题 ] (分) C1_Internet_English 中

Packet switching allows more users to use network than circuit switching.

A
```
true
```
B
```
false
```

4 [ 单选题 ] (分) C4en 中

Two packets A and B are sent in the order A-B and will traverse a connectionless communication network. They will arrive at the destination ( ).

in any order, after having traversed the same route

in the order A-B, after possibly having traversed different routes

in any order, after possibly having traversed different routes

 in the order A-B, after having traversed the same route

5 [ 单选题 ] (分) C5链路层_English 中

which of the following is not a class of multiple access protocol?

A
```
channel partitioning
```
B
```
random access
```
C
```
taking turns
```
D
```
flow control
```

6 [ 单选题 ] (分) C5链路层_English 中

What is the name of a link-layer packet? （）

A
```
message
```
B
```
segment
```
C
```
datagram
```
D
```
frame
```

7 [ 单选题 ] (分) C4en 中

The mask of a subnet is 255.255.255.248. So the subnet at most can connect ( ) hosts.

A
```
8
```
B
```
6
```
C
```
248
```
D
```
246
```

题目解析：

248 = 255 - 7 and 7 = 111  , 2^3-2 = 6 (000,111 is not includes)

8 [ 单选题 ] (分) C2应用层英文en 中

Which of the following codes denotes(表示) that requested document does not exist on the server according the HTTP protocol? ( ) .

A
```
200
```
B
```
400
```
C
```
404
```
D
```
505
```

题目解析：

200 OK； 301：永久转移； 400：bad Request; 404: not found ; 505 version not supported

9 [ 单选题 ] (分) C4en 中

In Internet, the two key network-layer functions are( ).

A
```
Routing and forwarding
```
B
```
Packet switching and circuit switching
```
C
```
Storing and forwarding
```
D
```
Routing and packing
```

10 [ 判断题 ] (分) C4en 中

IP (Internet Protocol) can guaranteed delivery。

A
```
True
```
B
```
False
```

11 [ 单选题 ] (分) C4en 中

How many IP addresses does a router have?

A
```
0
```
B
```
1
```
C
```
2
```
D
```
one address for each interface
```

12 [ 单选题 ] (分) C4en 中

What is the 32-bit binary equivalent of the IP address 223.1.3.27? ( )

A
```
11101111.00000001.00000011.00011011
```
B
```
11101111.00000001.00000011.00011010
```
C
```
11011111.00000001.00000011.00011010
```
D
```
11011111.00000001.00000011.00011011
```

题目解析：

13 [ 单选题 ] (分) C2应用层英文en 中

The transfer of an Web document from one host to another is ( ).

A
```
loss-intolerant and time insensitive
```
B
```
loss-tolerant and time sensitive
```
C
```
loss-intolerant and time sensitive
```
D
```
none of the above
```

14 [ 单选题 ] (分) C4en 中

Which layer in the Internet protocol stack doesn't a router process? ( )

A
```
the transport layer
```
B
```
the network layer
```
C
```
the link layer
```
D
```
the physical layer
```

15 [ 单选题 ] (分) C1_Internet_English 中

The original reason for the Internet to use packet switching is ( ).

Statistical multiplexing enables efficient sharing of expensive long-haul links.

Packet switching enables data to be routed faster than circuit switching.

It is less work for a router to process a packet than to process the data in a circuit.

Packet switching requires simpler hardware on the routers than circuit switching.

题目解析：

Statistical 
adj.统计的; 统计学的; 
[例句]The report contains a great deal of statistical information
报告中包含很多统计资料。

16 [ 单选题 ] (分) C4en 难

Consider sending a 999 byte datagram into a link that has an MTU of 500 bytes, ( ).

2 fragments are created with offset field value 0, 500, respectively

3 fragments are created with offset field value 0, 480,960, respectively

3 fragments are created with offset field value 0, 60,120, respectively

D
```
None of the above
```

题目解析：

data length = offset * 8 bytes

17 [ 组合题 ] (分) C4en 难

Suppose an ISP owns the block of addresses of the form 128.129.80.128/26.

1 [ 单选题 ] (分) 未指定技能难

Suppose the block of address is a subnet. which of the following is its subnet mask?

A
```
255.255.0.0
```
B
```
255.255.255.0
```
C
```
255.255.255.128
```
D
```
255.255.255.192
```

题目解析：

26=8+8+8+2   
 1100 0000 = 128+64=192

2 [ 填空题 ] (分) 未指定技能难

Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What are the prefixes (of form a.b.c.d/x, such as 128.129.80.128/26) for the four subnets?

参考答案：

无

题目解析：

4 = 2^2   00 01 10 11
26+2 = 28   128.129.80.128 =128.129.80.1000 0000
1000 0000 = 128
1001 0000 = 128+16=144
1010 0000 = 160
1011 0000 = 176

18 [ 组合题 ] (分) C4en 中

There is a block of addresses 218.94.21.0/24.

1 [ 单选题 ] (分) 未指定技能中

Please denote the block of addresses in binary system.

11011011   01011110  00010101  00000000/24

11011010   01011111  00010101  00000000/24

11011010   01011110  00010100  00000000/24

11011010   01011110  00010101  00000000/24

题目解析：

2 [ 填空题 ] (分) 未指定技能中

Please create four subnets (of form a.b.c.d/x) from the addresses at the same size. the four subnet are ( )、（）、（）and ( ). please use the form of a.b.c.d/x, such as 218.94.21.0/24 for each blank.

参考答案：

无

题目解析：

4 need 2 bit: 00 01 10 11

24+2 = 26 = 8+8+8+2

218.94.21.0/24

218.94.21.00000000/24 are divided into 4 subnets:

218.94.21.00000000/26

218.94.21.01000000/26 =>218.94.21.64/26

218.94.21.10000000/26

218.94.21.11000000/26

3 [ 单选题 ] (分) 未指定技能中

What is the range of host id for the sub-network 218.94.21.64/26?

A
```
218.94.21.64~218.94.21.127
```
B
```
218.94.21.64~218.94.21.126
```
C
```
218.94.21.65~218.94.21.127
```
D
```
218.94.21.65~218.94.21.126
```

题目解析：

host id：  all  0 is for subnet address;   and all 1 is for broadcast address
218.94.21.01000000/26   =>218.94.21.64/26
218.94.21.01000001 ~ 218.94.21.01111110 is 218.94.21.65~218.94.21.126

19 [ 组合题 ] (分) C1计算机网络与因特网中

假定用户共享一条3Mbps链路。同时假定当每个用户传输时连续以150kbps传输，但每个用户仅传输20%的时间。

1 [ 填空题 ] (分) 未指定技能中

当使用电路交换时，能够支持（）个用户。

参考答案：

无

题目解析：

3Mbps/150kbps=20

（提示：简答题、或者组合题时，要写计算步骤，步骤中的G、M、K以及单位要正确。1B=8b，1bps=1b/s。）

2 [ 填空题 ] (分) 未指定技能中

假定使用分组交换，少于或等于（）个用户同时传输时，链路前面基本没有排队延时。

参考答案：

无

3 [ 填空题 ] (分) 未指定技能中

某指定用户正在传输的概率是（）

参考答案：

无

题目解析：

4 [ 填空题 ] (分) 未指定技能中

假定现在有3个用户。任何给定时刻，所有3个用户在同时传输的概率是（）。

参考答案：

无

题目解析：

C(3,3)(0.2*0.2*0.2)=0.008

5 [ 填空题 ] (分) 未指定技能中

假定现在有4个用户。求任何给定时刻，所有3个用户在同时传输的概率是（）。

参考答案：

无

题目解析：

C(4,3)(0.2*0.2*0.2)(1-0.2) = 4*0.2*0.2*0.2*0.8 = 0.0256

c(m,n)=p(m,n)/n!=m!/((m-n)!*n!)

20 [ 判断题 ] (分) C1计算机网络与因特网易

Web服务器是一种端系统。

A
```
对
```
B
```
错
```

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