题库·思科认证
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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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单选题

当拓扑信息完成交换，相邻路由器具有相同的LSDB时，下列哪项OSPF邻居状态是希望得到的()

A
2-WAY
B
FULL
C
Exchange
D
Loading

题目答案

B

答案解析

暂无解析
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单选题

OSPF在同一区域内，下列说法正确的是（）

A
每台路由器生成的LSA都是相同的
B
每台路由器的LSDB(链路状态数据库)都是相同的
C
每台路由器根据该LSDB计算出的最短路径树都是相同的
D
每台路由器根据该最短路径树计算出的路由都是相同的

题目答案

B

答案解析

暂无解析
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