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CCNA 640-802 V14 题库(136-140)

2008-07-17 11:24 佚名 51CTO.com 字号:T | T
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本文内容为Testinside CCNA 640-802 V14 最新题库(136-140)试题及答案。

AD:

136. What are two recommended ways of protecting network device configuration files from outside network security 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. The network shown in the exhibit is running the RIPv2 routing protocol. The network has converged, and the routers in this network are functioning properly. The FastEthernet0/0 interface on R1 goesdown. In which two ways will the routers in this network respond to this change? (Choose two.)

  

A. All routers will reference their topology database to determine if any backup routes to the 192.168.1.0 network are known.

B. Routers R2 and R3 mark the route as inaccessible and will not accept any further routing updates from R1 until their hold-down timers expire.

C. Because of the split-horizon rule, router R2 will be prevented from sending erroneous information to R1 aboutconnectivity to the 192.168.1.0 network.

D. When router R2 learns from R1 that the link to the 192.168.1.0 network has been lost, R2 will respond bysending a route back to R1 with an infinite metric to the 192.168.1.0 network.

E. R1 will send LSAs to R2 and R3 informing them of this change, and then all routers will send periodic updatesat an increased rate until the network again converges.

Answer: CD

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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