Recommended QoS Best Practice for Classifying and Marking Traffic

A.

The recommended best practice for Quality of Service (QoS) is to classify and mark traffic as close to the traffic source as possible. This is typically done at the access layer or the edge of the network.

There are a few reasons for this recommendation. First, by classifying and marking traffic close to the source, the network can better control and prioritize traffic as it traverses the network. This can help to ensure that critical traffic, such as voice or video, is given priority over less important traffic, such as file transfers or email.

Secondly, marking traffic close to the source can help to reduce congestion in the network. By marking traffic with the appropriate QoS values, the network can ensure that congested links prioritize important traffic and reduce the likelihood of packet drops and retransmissions.

Lastly, marking traffic at the source can provide more granular control over QoS policies. By applying QoS policies at the access layer, network administrators can tailor QoS policies to specific types of traffic and endpoints, rather than applying broad policies at the core or distribution layer.

In summary, the recommended best practice for QoS is to classify and mark traffic as close to the source as possible, typically at the access layer or edge of the network. This provides better control over traffic prioritization, reduces congestion, and enables more granular QoS policies.