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.
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.
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
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