Voice traffic between two campus enterprise networks is growing. The network designers decide to add a second 10-Mb Metro Ethernet service parallel to their original 10-Mb service in order to provide more bandwidth and diversity. The QoS profile will be the same on the new 10-Mb service due to the voice stability on the first Metro Ethernet link. When the second link is added to the OSPF domain, which traffic design consideration would have the most impact on the voice traffic when both links are active?

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C. per-packet basis Per-packet load balancing distributes individual packets across both links in alternating fashion, causing out-of-order delivery within the same voice stream. Voice traffic is extremely sensitive to jitter and packet reordering because RTP does not retransmit, and reordered packets are discarded by the codec. This makes per-packet ECMP the highest-impact configuration choice for voice quality when both links are active.

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A. per-destination IP address basis Per-destination load balancing keeps all traffic destined for the same IP on a single link, so voice stream packets remain ordered and in-sequence.

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B. per-flow basis Per-flow load balancing hashes on source IP, destination IP, and ports to pin each voice call to one link, preserving packet order and minimizing jitter for that flow.

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D. per-source IP address basis Per-source load balancing forwards all traffic originating from the same source IP over the same link, maintaining packet sequence for individual voice endpoints.

Voice traffic between two campus enterprise networks is growing. The network designers decide to add a second 10-Mb Metro Ethernet service parallel to their original 10-Mb service in order to provide

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