In QoS, which prioritization method is appropriate for interactive voice and video?
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The prioritization method that is appropriate for interactive voice and video in QoS (Quality of Service) is Low-Latency Queuing (LLQ).
LLQ is a QoS mechanism that provides strict priority queueing for interactive voice and video traffic. LLQ uses class-based packet queuing and prioritizes delay-sensitive traffic such as voice and video above other types of traffic.
When LLQ is enabled on a router or switch, a strict priority queue is created for voice and video traffic. This means that voice and video packets are placed in a separate queue, which is processed before all other traffic. This ensures that voice and video traffic is not delayed, even when other types of traffic are congested.
LLQ uses a three-level hierarchical queuing model. The highest level is the priority queue for voice and video traffic. The second level is a queue for traffic that has been marked with a higher priority than normal traffic, such as control traffic or network management traffic. The third level is a queue for all other traffic.
LLQ is the preferred method for prioritizing voice and video traffic because it provides strict priority queueing, which ensures that voice and video traffic is not delayed, even when other types of traffic are congested. Other methods such as round-robin scheduling, traffic policing, or expedited forwarding do not provide the same level of prioritization and may result in delayed or dropped voice and video packets.