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Exam 400-007 All Questions

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Exam 400-007 topic 1 question 75 discussion

Actual exam question from Cisco's 400-007
Question #: 75
Topic #: 1
[All 400-007 Questions]

Which two actions ensure voice quality in a branch location with a low-speed, high-latency WAN connection? (Choose two.)

  • A. Prioritize voice packets.
  • B. Replace any electrical links with optical links.
  • C. Increase memory on the branch switch.
  • D. Fragment data packets.
  • E. Increase WAN bandwidth.
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Suggested Answer: AD 🗳️

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Jentti
Highly Voted 1 year, 10 months ago
Selected Answer: AD
fragmenting data prevents HOL blocking
upvoted 6 times
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Leon_Wang
Highly Voted 2 years, 2 months ago
Selected Answer: AE
I think fragmentation increases packet latency, affect voice quality.
upvoted 5 times
ying162
2 years, 2 months ago
it is fragmenting data packets and not voice. It is a technique so that the processing the data packet does not delay voice packets in the queue
upvoted 8 times
Leon_Wang
2 years, 2 months ago
you are right,thank you. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/12156-voip-ov-fr-qos.html
upvoted 4 times
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0d1b5b9
Most Recent 5 months, 3 weeks ago
Selected Answer: AD
I think the trick is "high latency" on this wan link, if latency is high, increase bandwidth won't do any help. eg: you got some big data packet, like 9192 bytes, already in queue, the next voice package must wait for this to be transmitted, but if you fragment the data packet, voice packet and be transferred immediate after a small data frame is sent. Don't think about the re-transmission or CPU utilization, the question doesn't ask us to think that comprehensive/detail.
upvoted 1 times
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0d1b5b9
5 months, 3 weeks ago
Selected Answer: AD
fragment DATA packet, so voice can be transmitted during large data packet transfer, which improve the quality
upvoted 1 times
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anonymousch
6 months ago
Selected Answer: AD
From Cisco doc: . If non-real-time data packets are fragmented into smaller frames, they are interleaved with real-time (voice) frames. In this way, both voice and data frames can be carried together on low speed links without causing excessive delay to the real-time voice traffic.
upvoted 1 times
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caleb
1 year, 2 months ago
Selected Answer: AE
AE are correct, fragmentation will add serialization delay
upvoted 3 times
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XalaGyan
1 year, 2 months ago
fragmentation can lead to more retransmission of lost fragments and therefore affect the already bad link in a negativ way. Increase BW is the magical cure to everything QoS related and Voice Prioritization is a no brainer. Answers AE
upvoted 1 times
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