题库·思科认证
计算机类思科认证
47 喜欢·147 浏览
单选题

在OSI七层模型中，介质工作在哪一层()

A
传输层
B
会话层
C
物理层
D
应用层

题目答案

C

答案解析

暂无解析
纠错重做查看答案
举一反三
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
纠错收藏详情重做查看答案
单选题

Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?

A
255.255.255.192
B
255.255.255.224
C
255.255.255.240
D
255.255.255.248
E
None of the above

题目答案

C

答案解析

Explanation:Usingthe2n-2formula,wewillneedtouse4bitsforsubnetting,asthiswillprovidefor24-2=14subnets.Thesubnetmaskfor4bitsisthen255.255.255.240.IncorrectAnswers:A.Thiswillgiveusonly2bitsforthenetworkmask,whichwillprovideonly2networks.B.Thiswillgiveus3
纠错收藏详情重做查看答案
单选题

What is the subnet for the host IP address 201.100.5.68/28?

A
201.100.5.0
B
201.100.5.32
C
201.100.5.64
D
201.100.5.65
E
201.100.5.31
F
201.100.5.1

题目答案

C

答案解析

解析：EXPLANATION:THIS QUESTION IS MUCH EASIER THEN IT APPEARS WHEN YOU CONVERT IT TO BINARY AND DO THE BOOLEAN OPERATION AS SHOWN BELOW:IP ADDRESS 201.100.5.68 = 11001001.01100100.00000101.01000100/28 MASK = 11111111.11111111.11111111.11000000AND RESULT
纠错收藏详情重做查看答案
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
纠错收藏详情重做查看答案
单选题

请参见图示。根据showipnattranslations命令的输出，此路由器上正在使用哪种地址转换()

A
静态NAT
B
动态NAT
C
PAT
D
私有NAT

题目答案

C

答案解析

暂无解析
纠错收藏详情重做查看答案
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
纠错收藏详情重做查看答案
单选题

TCP23是（）协议端口号；UDP69是（）端口号；TCP80是（）端口号。

A
TELNET FTP HTTP
B
FTPT FTP HTTP
C
TELNET TFTP HTTP
D
TELNET DNS HTTP

题目答案

C

答案解析

暂无解析
纠错收藏详情重做查看答案
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.
纠错收藏详情重做查看答案