Which of the following performance optimization techniques would be MOST beneficial for a
network-wide VoIP setup? (Select TWO).

A.
Proxy server

B.
Traffic shaping

C.
Caching engines

D.
Load balancing

E.
Quality of service

Explanation:

Traffic shaping retains excess packets in a queue and then schedules the excess for later
transmission over increments of time. The result of traffic shaping is a smoothed packet output
rate. QoS (Quality of Service) is a major issue in VOIP implementations. The issue is how to
guarantee that packet traffic for a voice or other media connection will not be delayed or dropped
due interference from other lower priority traffic.
Things to consider are:
Latency: Delay for packet delivery
Jitter: Variations in delay of packet delivery
Packet loss: Too much traffic in the network causes the network to drop packets
Burstiness of Loss and Jitter: Loss and Discards (due to jitter) tend to occur in bursts