An engineer wants the wireless voice traffic class of service to be used to determine the queue order for packets received, and then have the differentiated services code point set to match when it is resent to another port on the switch.
Which configuration is required in the network?
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A. B. C. D.C.
The correct answer to this question is option D: "msl qos trust cos configured on the controller switch port."
Explanation:
In a wireless network, Quality of Service (QoS) refers to the ability of the network to provide different priority to different types of traffic. This is especially important for voice traffic, which requires low latency and minimal packet loss to maintain call quality.
To ensure that voice traffic is given priority over other types of traffic in the network, an engineer may want to configure the wireless voice traffic class of service to determine the queue order for packets received. This means that voice traffic will be queued before other types of traffic, and will be transmitted first when there is congestion in the network.
In addition, the engineer wants to set the differentiated services code point (DSCP) to match when the traffic is resent to another port on the switch. This is important because DSCP is used to prioritize traffic on switches and routers, and setting the DSCP value will ensure that voice traffic continues to receive priority treatment as it moves through the network.
To achieve these goals, the engineer should configure the switch port connected to the wireless controller to trust the class of service (CoS) value of the incoming traffic. Specifically, the "msl qos trust cos" command should be used on the switch port. This command tells the switch to trust the CoS value of incoming packets and to use it for queuing and forwarding decisions.
By trusting the CoS value of incoming packets, the switch will ensure that voice traffic is given priority over other types of traffic, and will set the appropriate DSCP value when the traffic is resent to another port on the switch.
Therefore, option D is the correct answer to this question. Options A and B are incorrect because they do not specifically address the need to trust the CoS value of incoming packets. Option C is also incorrect because it refers to trusting the DSCP value, which is not the same as trusting the CoS value.