Which two statements about policing, queuing, and scheduling are true? (Choose two.)
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A. B. C. D. E.BE.
Policing, queuing, and scheduling are all mechanisms used in network traffic management to ensure that network resources are efficiently utilized while providing quality of service (QoS) to different types of traffic.
Here are the two statements that are true:
B. Policing is the monitoring of data rates for a particular class of traffic. The device can also monitor associated burst sizes.
Traffic policing is a mechanism used to control the rate of traffic entering a network. It is commonly used to enforce a maximum rate of traffic for a particular class of traffic. In policing, packets that exceed the defined rate limit are dropped or marked as lower priority. This mechanism can help prevent network congestion and ensure that available bandwidth is distributed fairly among different traffic classes. Additionally, burst sizes can also be monitored and policed, which is important for managing bursty traffic patterns.
E. You can apply WRED to a class of traffic, which allows packets to be dropped based on the CoS field.
Weighted Random Early Detection (WRED) is a mechanism used for managing network congestion. WRED randomly drops packets before the queue fills up, allowing traffic to be managed before congestion occurs. WRED can be applied to a class of traffic, which means that packets belonging to a particular traffic class can be dropped based on their Class of Service (CoS) value. CoS is a field in the packet header that identifies the priority of the packet. By dropping packets with lower priority values, WRED can ensure that higher priority traffic is given preferential treatment.
A. The WRED algorithm is a reactive approach that only applies to traffic congestion.
This statement is not entirely true. While WRED is indeed used to manage network congestion, it is not a purely reactive approach. WRED can be configured to proactively manage congestion by dropping packets before the queue fills up. This proactive approach can help prevent congestion from occurring in the first place.
C. You can schedule traffic by imposing a maximum data rate on a class of traffic so that excess packets are dropped from the queue.
This statement is not entirely true. While it is possible to schedule traffic by imposing a maximum data rate on a class of traffic, this does not necessarily result in excess packets being dropped from the queue. Instead, excess packets may be buffered or queued until network resources become available. In contrast, the policing mechanism described in statement B is used to drop packets that exceed a defined rate limit.