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5.2 Describe the QoS requirements for these application types (voice and video)




Quality of Service (QoS) is a set of technologies and techniques that are used to manage and prioritize network traffic to ensure that mission-critical applications, such as voice and video, receive the necessary bandwidth and performance to function properly.

Here are the QoS requirements for voice and video applications:

  1. Voice: Voice applications require low latency and jitter to provide clear and consistent audio quality. They also require a minimum amount of bandwidth, typically around 64 kbps for a standard G.711 codec call. To ensure that voice traffic is properly prioritized, voice traffic should be marked with a Differentiated Services Code Point (DSCP) value of 46 (EF) in the IP header.

  2. Video: Video applications require a higher bandwidth than voice applications, typically around 1 Mbps or higher for standard-definition video. They also require low latency and jitter to provide smooth video playback. Video traffic should be marked with a DSCP value of 34 (AF41) in the IP header to ensure proper prioritization.

  3. Quality of Service Marking: Quality of Service Marking is the process of tagging the packets with specific values in the IP header to indicate their priority, this is done by using the Differentiated Services Code Point (DSCP) field. This allows network devices to identify and prioritize specific types of traffic, such as voice and video, as they pass through the network.

  4. Quality of Service Queuing: Quality of Service Queuing is the process of managing and prioritizing network traffic at the network level. It uses different queuing techniques such as Weighted Fair Queueing


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