Cisco
352-001 · Question #13
352-001 Question #13: Real Exam Question with Answer & Explanation
The correct answer is C: per-packet basis. With two equal-cost OSPF paths active, the load-balancing method determines packet ordering for voice flows, and per-packet switching is the most disruptive option for real-time traffic.
Question
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?
Options
- Aper-destination IP address basis
- Bper-flow basis
- Cper-packet basis
- Dper-source IP address basis
Explanation
With two equal-cost OSPF paths active, the load-balancing method determines packet ordering for voice flows, and per-packet switching is the most disruptive option for real-time traffic.
Common mistakes.
- A. 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.
- B. 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.
- D. Per-source load balancing forwards all traffic originating from the same source IP over the same link, maintaining packet sequence for individual voice endpoints.
Concept tested. OSPF ECMP per-packet load balancing impact on voice
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