题库·Linux认证
计算机类Linux认证
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单选题

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

题目答案

B

答案解析

暂无解析
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举一反三
单选题

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

题目答案

A

答案解析

暂无解析
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单选题

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

题目答案

D

答案解析

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

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.

题目答案

C

答案解析

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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单选题

Which command on router EzonexamA will assign the last usable IP address from the 192.168.32.128/28 subnetwork to a router interface?

A
EzonexamA(config-if) ip address 192.168.32.142 255.255.255.240
B
EzonexamA(config-if) ip address 192.168.32.143 255.255.255.240
C
EzonexamA(config-if) ip address 192.168.32.158 255.255.255.240
D
EzonexamA(config-if) ip address 192.168.32.145 255.255.255.240
E
EzonexamA(config-if) ip address 192.168.32.144 255.255.255.240
F
EzonexamA(config-if) ip address 192.168.32.158 255.255.255.240
G
None of the above

题目答案

A

答案解析

解析：EXPLANATION:THE LAST USABLE IP ADDRESS WOULD BE 128 + (16-2) = 142 BECAUSE ONLY THE LAST 4 BITS OF THE LAST OCTET ARE USED FOR HOST ADDRESSING.
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单选题

在OSPF的DR/BDR选举过程中，在路由器有相同的接口优先级情况下，什么用于确定DR或BDR（）

A
最高的OSPF进程ID
B
最低的接口IP地址
C
最低的接口开销
D
路由器ID

题目答案

D

答案解析

暂无解析
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