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Cisco CCNA 640-802试题(126-130)

2008-07-14 12:42 佚名 51cto.com 字号:T | T
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本文内容为Cisco CCNA认证考试640-802(126-130)试题及答案。

AD:

126. Why does the data communication industry use the layered OSI reference model? (Choose two.)

A. It divides the network communication process into smaller and simpler components, thus aiding component

development, design, and troubleshooting.

B. It enables equipment from different vendors to use the same electronic components, thus saving research and

development funds.

C. It supports the evolution of multiple competing standards, and thus provides business opportunities for

equipment manufacturers.

D. It encourages industry standardization by defining what functions occur at each layer of the model.

E. It provides a means by which changes in functionality in one layer require changes in other layers.

Answer: AD


127. Users on the 172.17.22.0 network cannot reach the server located on the 172.31.5.0 network. The network administrator connected to router Coffee via the console port, issued the show ip route command, and was able to ping the server. Based on the output of the show ip route command and the topology shown in the graphic, what isthe cause of the failure?

 

A. The network has not fully converged.

B. IP routing is not enabled.

C. A static route is configured incorrectly.

D. The FastEthernet interface on Coffee is disabled.

E. The neighbor relationship table is not correctly updated.

F. The routing table on Coffee has not updated .

Answer: C


128. The network security policy requires that only one host be permitted to attach dynamically to each switchinterface. If that policy is violated, the interface should shut down. Which two commands must the networkadministrator configure on the 2950 Catalyst switch to meet this policy? (Choose two.)

A. Switch1(config-if)# switchport port-security maximum 1

B. Switch1(config)# mac-address-table secure

C. Switch1(config)# access-list 10 permit ip host

D. Switch1(config-if)# switchport port-security violation shutdown

E. Switch1(config-if)# ip access-group 10

Answer: AD

129. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?

A. Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link.

B. Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal.

C. Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth.

D. Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and

receive.

Answer: C

130. Refer to the exhibit.  

 

A network associate has configured OSPF with the command:

City(config-router)# network 192.168.12.64 0.0.0.63 area 0

After completing the configuration, the associate discovers that not all the interfaces are participating in OSPF.

Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration

statement? (Choose three.)

A. FastEthernet0 /0

B. FastEthernet0 /1

C. Serial0/0

D. Serial0/1.102

E. Serial0/1.103

F. Serial0/1.104

Answer: BCD

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