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最新的 CCIP 642-642 免費考試真題:

1. DRAG DROP
Drop

2. Based on the following policy-map configuration, the bulk traffic class packets are not being ECN
marked, yet there are many random drops in the bulk traffic class. What is the most likely cause of
the problem?
router(config)# policy-map MyPolicy
router(config-pmap)# class bulk
router(config-pmap)# bandwidth 128
router(config-pmap-c)# random-detect dscp-based
router(config-pmap-c)# random-detect dscp af31 32 40 10
router(config-pmap-c)# random-detect dscp af32 28 40 10
router(config-pmap-c)# random-detect dscp af33 24 40 10
router(config-pmap-c)# random-detect ecn

A) The CB-WRED max threshold is set too high.
B) The endpoints generating the bulk traffic packets are not ECN capable.
C) The CB-WRED mark probability denominator is set too low.
D) The CB-WRED min threshold is set too low.
E) Some of the routers within the traffic path are not ECN capable.

3. This policy-map is applied to a 128-kbps serial interface in the output direction. Which set of additional commands within this policy-map will improve the link efficiency on the serial interface?
policy-map test
class voice
priority 25
class telnet
bandwidth remaining percent 20
class ftp
bandwidth remaining percent 30

A) class voice
no priority 25
bandwidth percent remaining 25
B) class voice
compression header ip tcp
C) class telnet
compression header ip tcp
D) class ftp
compression header ip
E) class telnet
fair-queue
F) class ftp
fair-queue

4. What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt

A) enables the router to increase the shaping rate when BECN bits are received
B) enables the router to increase the shaping rate when FECN bits are received
C) enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set
D) enables the router to lower the shaping rate when FECN bits are received
E) enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set
F) enables the router to lower the shaping rate when BECN bits are received

5. A major media company recently deployed a new converged network. The original network design used separate networks for graphics and video, interactive data, and voice. The company has been experiencing problems with voice traffic in the new converged network. Most of the time voice quality is perfectly acceptable. Periodically voice quality exhibits unacceptable choppy voice signals, and occasionally calls are dropped. At this time the company is not willing to simply add bandwidth to the network.
Which QoS solution would most likely help to resolve the problem?

A) Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.
B) Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.
C) Use TCP header compression and LFI to reduce delays.
D) Use advanced technologies to compress all video and graphics traffic on the network.

問題與答案：