CCNA640-802题库解析–网络设备间的连线

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本文主要结合例题讲解如何选择适当的介质、线缆、端口和连接器连接网络设备。
Refer to the exhibit. What kind of cable should be used to make each connection that is identified by the numbers shown?
A: 1 - Ethernet crossover cable
2 - Ethernet straight-through cable
3 - fiber optic cable
4 - rollover cable
B: 1 - Ethernet straight-through cable
2 - Ethernet straight-through cable
3 - serial cable
4 - rollover cable
C: 1 - Ethernet rollover cable
2 - Ethernet crossover cable
3 - serial cable
4 - null modem cable
D: 1 - Ethernet straight-through cable
2 - Ethernet crossover cable
3 - serial cable
4 - rollover cable
E: 1 - Ethernet straight-through cable
2 - Ethernet crossover cable
3 - serial cable
4 - Ethernet straight-through cable
Correct Answers:B
直通线缆：主机—–交换机/hub
路由器—–交换机/hub
交叉线缆：交换机/hub/主机—–交换机/hub/主机
交换机—-hub
主机—–路由器
反转线缆：主机——控制台
相同设备相连使用交叉线，而不同设备相连使用直连线，路由器之间相连使用串行线，反序线用于做配置时。
Refer to the exhibit. Assuming that the router is configured with the default settings, what type of router interface is this?
A: Ethernet
B: FastEthernet
C: Gigabit Ethernet
D: asynchronous serial
E: synchronous serial
Correct Answers:B
Explanation:
这个题是需要根据图中提供的信息来判断接口的类型。可以看到接口的MAC地址，表示这个接口肯定不是串行接口，所以可以排除D和E的选项。看带宽BW 100000 Kbit,表示的是100M的带宽，所以这是个Fast Ethernet接口。
Refer to the exhibit. Two buildings on the San Jose campus of a small company must be connected to use Ethernet with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage potential differences between the two buildings. Which media type should be used for the connection?
A: UTP cable
B:STPcable
C: coaxial cable
D: fiber optic cable
Correct Answers:D
电压不同，而且两个公司的距离不是很远，当然可以考虑光纤了。
Refer to the exhibit. Thenetworkadministrator is in a campus building distant from Building B. WANRouter is hosting a newly installedWANlink on interface S0/0. The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface. How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?
要检验端口s0/0的线缆类型，首先要登陆到路由器上去，我们可以通过telnet的技术登上去，查看接口所接的线缆的类型使用的命令为show controller s0/0,可以看到接口的状态为DTE，或是DCE。