解析：EXPLANATION:THE CREATION OF VLANS IN A SWITCH WILL PROVIDE SEPARATE BROADCAST DOMAINS. BY DEFAULT, ALL PORTS IN A CATALYST SWITCH BELONG TO VLAN 1. BY CREATING ADDITIONAL VLANS, THE LAN WILL BE LOGICALLY SEGMENTED INTO SEPARATE BROADCAST DOMAINS.INC

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单选题

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C

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解析：EXPLANATION:WHEN A HOST ON AN ETHERNET LAN HAS INFORMATION TO SEND, THE FOLLOWING STEPS ARE TAKEN:1. A DEVICE WITH A FRAME. TO SEND LISTENS UNTIL ETHERNET IS NOT BUSY.2. WHEN THE ETHERNET IS NOT BUSY, THE SENDER BEGINS SENDING THE FRAME.3. THE SENDE

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Answer 1

当到达文件尾端或出错时，字符读取函数的返回值都是EOF,为进一步确认文件是否已到文件尾，应当通过()函数来判断。

A

ferror

B

feof

C

cleanerr

D

perror

Answer 2

在定位函数中，可直接将流的读写指针设置到文件的起始位置同时会将错误指示器errno清零的函数是（）rewind

A

ferror

B

feof

C

clearerr

D

perror

Answer 3

下面关于ftell（）函数成功调用说法不正确的是()

A

会清除流结束标志

B

返回读写指针当前相对文件起始位置的位移量

C

返回读写指针当前相对文件结束位置的位移量

D

会撤销已调用ungetc（）对流的影响

Answer 4

格式化输出可把格式化数据输出到标准输出、指定文件及字符缓冲区。其中（）函数是将格式化数据输出到指定大小的字符缓冲区。()

A

printf

B

f printf

C

s printf

D

sn printf

Answer 5

格式化输入可从标准输入、指定文件及字符缓冲区读取格式化数据。其中（）函数是输出到指定文件。()

A

printf

B

f printf

C

s printf

D

sn printf

Answer 6

关于临时文件不正确的是()

A

可通过tmp nam（）创建

B

也可通过tmp file（）创建

C

程序结束时或关闭文件时自动删除

D

调用tmp name次数有限制

Answer 7

下面哪种业务UE的耗电量最大()

A

12.2kbps语音业务

B

64kbpsVP业务

C

144kbpsVOD业务

D

384kbps数据业务

Answer 8

下列是外部路由协议的是（）

A

rip

B

ospf

C

igrp

D

bgp

E

eigrp

Answer 9

在Windows95/98的DOS窗口下，能用以下命令察看主机的路由表（）

A

Sh ip route

B

ARP -A

C

TRACEROUTE

D

ROUTE PRINT

Answer 10

You wish to segment your LAN into multiple broadcast domains. Which technology method should you implement in order to do this?

A

Transparent bridging

B

Cut-through switching

C

Fragment-free switches

D

Virtual LANs

E

Store-and-forward switching

F

None of the above

Answer 11

On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)

A

The destination host sends a request to the source for retransmission.

B

The jam signal indicates that the collision has been cleared.

C

The hosts will attempt to resume transmission after a time delay has expired.

D

An electrical pulse indicates that the collision has cleared.

E

The router on the segment will signal that the collision has cleared.

F

The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.

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