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Cisco CCNA 640-802试题(136-140)

2008-07-14 12:55 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(136-140)试题及答案。

AD:

136. What are two recommended ways of protecting network device configuration files from outside networksecurity threats? (Choose two.)

A. Allow unrestricted access to the console or VTY ports.

B. Use a firewall to restrict access from the outside to the network devices.

C. Always use Telnet to access the device command line because its data is automatically encrypted.

D. Use SSH or another encrypted and authenticated transport to access device configurations.

E. Prevent the loss of passwords by disabling password encryption.

Answer: BD


137. What are two characteristics of Telnet? (Choose two.)

A. It sends data in clear text format.

B. It is no longer supported on Cisco network devices.

C. It is more secure than SSH.

D. It requires an enterprise license in order to be implemented.

E. It requires that the destination device be configured to support Telnet connections.

Answer: AE


138. Refer to the exhibit. Why does RouterA show multiple unequal cost paths to network 192.168.81.0/24?

  

A. A variance was configured for EIGRP autonomous system 109.

B. The EIGRP topology table displays all routes to a destination.

C. The EIGRP topology table shows only backup routes to a destination.

D. Multiple floating static routes were configured to network 192.168.81.0 via interface Serial0.

Answer: B


139. Which of the following are key characteristics of PPP? (Choose three.)

A. can be used over analog circuits

B. maps Layer 2 to Layer 3 address

C. encapsulates several routed protocols

D. supports IP only

E. provides error correction

Answer: ACE


140. The network administrator of the Oregon router adds the following command to the router configuration: ip route 192.168.12.0 255.255.255.0 172.16.12.1. What are the results of adding this command? (Choose two.)

  

A. The command establishes a static route.

B. The command invokes a dynamic routing protocol for 192.168.12.0.

C. Traffic for network 192.168.12.0 is forwarded to 172.16.12.1.

D. Traffic for all networks is forwarded to 172.16.12.1.

E. This route is automatically propagated throughout the entire network.

F. Traffic for network 172.16.12.0 is forwarded to the 192.168.12.0 network.

Answer: AC

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