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CCNA 640-802 V14 题库(156-160)

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(156-160)试题及答案。

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156. Refer to the exhibit. The network administrator must complete the connection between the RTA of the XYZCompany and the service provider. To accomplish this task, which two devices could be installed at the customer site to provide a connection through the local loop to the central office of the provider? (Choose two.)

  

A. WAN switch

B. PVC

C. ATM switch

D. multiplexer

E. CSU/DSU

F. modem

Answer: EF

157. When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interfaceclock rate determined?

A. It is supplied by the CSU/DSU.

B. It is supplied by the far end router.

C. It is determined by the clock rate command.

D. It is supplied by the Layer 1 bit stream timing.

Answer: A

158. When a new trunk link is configured on an IOS based switch, which VLANs are allowed over the link?

A. By default, all defined VLANs are allowed on the trunk.

B. Each single VLAN, or VLAN range, must be specified with the switchport mode command.

C. Each single VLAN, or VLAN range, must be specified with the vtp domain command.

D. Each single VLAN, or VLAN range, must be specified with the vlan database command.

Answer: A

159. Acknowledgements, sequencing, and flow control are characteristics of which OSI layer?

A. Layer 2

B. Layer 3

C. Layer 4

D. Layer 5

E. Layer 6

F. Layer 7

Answer: C

160. Which of the following are types of flow control? (Choose three.)

A. buffering

B. cut-through

C. windowing

D. congestion avoidance

E. load balancing

Answer: ACD

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