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400-007 · Question #133
400-007 Question #133: Real Exam Question with Answer & Explanation
The correct answer is C: Fragment data packets.. On a low-speed, high-latency WAN, fragmenting large packets prevents them from blocking voice traffic, and QoS prioritization ensures voice packets are transmitted ahead of data.
Question
Which two actions ensure voice quality in a branch location with a low-speed, high-latency WAN connection? (Choose two.)
Options
- AIncrease WAN bandwidth
- BIncrease memory branch switch.
- CFragment data packets.
- DReplace any electrical links with optical links
- EPrioritize voice packets
Explanation
On a low-speed, high-latency WAN, fragmenting large packets prevents them from blocking voice traffic, and QoS prioritization ensures voice packets are transmitted ahead of data.
Common mistakes.
- A. Increasing WAN bandwidth may reduce congestion but does not address high latency, and is not always a feasible branch option - it does not solve serialization delay caused by large packets.
- B. Increasing memory on the branch switch affects local buffer capacity and has no effect on WAN link latency or voice packet scheduling.
- D. Replacing electrical links with optical links improves local segment performance and reliability but does not change the speed or latency of the WAN connection itself.
Concept tested. LFI fragmentation and QoS prioritization for voice over low-speed WAN
Reference. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-bwidth-consume.html
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