Authorized Self-Study Guide Cisco Voice over IP (CVoice)

Summary

This chapter introduced the need for quality of service (QoS) in a converged network environment (that is, a network that simultaneously transports voice, data, and/or video). In the absence of QoS mechanisms, voice packets might suffer from packet loss, packet delay, and variable delay (that is, jitter). QoS mechanisms help mitigate such challenges through tools such as classification, marking, low latency queuing (LLQ), RTP Header Compression (cRTP), and Link Fragmentation and Interleaving (LFI).

Even with its relatively high-speed connectivity, local area networks (LANs) also need QoS. For example, an interface speed mismatch for traffic entering (for example, on a 1 Gbps link) and exiting (for example, on a 100 Mbps link) a switch ...