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最新的 CCIP 642-642 免費考試真題:

1. Which three statements regarding WRED are true? (Choose three.)

A) WRED can be IP precedence-based or DSCP-based.
B) WRED is used to rate-limit the incoming traffic by metering the incoming traffic rate.
C) ECN is an extension of WRE
D) WRED uses a shaping queue to delay excess traffic.
E) WRED is an advanced queuing mechanism.
F) WRED can be applied to a traffic class using CB-WRED.

2. What are two benefits of WFQ? (Choose two.)

A) Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
B) WFQ can provide fixed-bandwidth and fixed-delay guarantees.
C) WFQ can provide fixed-bandwidth guarantees.
D) WFQ is very easy to configure, and no manual traffic classification is necessary.
E) WFQ can provide fixed-delay guarantees.
F) WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.

3. A Cisco Catalyst switch has an IP phone connected to its Fastethernet0/2 port. The IP phone has an attached PC. The Fastethernet0/2 port on the switch has been configured with the commands mls qos trust cos, mls qos trust device cisco-phone, and switchport priority extend trust.
What will happen to a data frame with a CoS of 5 that is sent from the PC through the IP phone to port Fastethernet0/2 on the switch?

A) While the packet will pass through the IP phone without modification, the switch will, by default, override theCoS priority with the switch default CoS priority.
B) The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.
C) The IP phone will allow the data packet through without modifying theCoS settings of the data frame.
D) The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.

4. What are three methods of reducing delay for critical applications in a converged network? (Choose three.)

A) Increase all queue depths.
B) Increase link capacities.
C) Increase LFI fragment size.
D) Apply payload compression.
E) Reduce inter-packet gaps.
F) Apply header compression.

5. Which algorithm (discard method) does WRED use to determine which packets will be dropped when the average queue length becomes larger than the user-specified maximum threshold?

A) weighted early discard
B) random discard
C) packet size based discard
D) tail discard

問題與答案：