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350-501 · Question #318

An engineer must implement QoS to prioritize traffic that requires better service throughout the network. The engineer started by configuring a class map to identify the high-priority traffic. Which…

The correct answer is B. Attach the class map to a policy map that designates the action to be taken on the classified. After creating a class map to identify high-priority traffic, the engineer must attach this class map to a policy map that defines the specific QoS actions to be taken on that traffic.

Networking

Question

An engineer must implement QoS to prioritize traffic that requires better service throughout the network. The engineer started by configuring a class map to identify the high-priority traffic. Which additional tasks must the engineer perform to implement the new QoS policy?

Options

  • AAttach the class map to a policy map that sets the minimum bandwidth allocated to the classified
  • BAttach the class map to a policy map that designates the action to be taken on the classified
  • CAttach the class map to a policy map within a VRF to segregate the high-priority traffic and then
  • DCreate a route map to manipulate the routes that are entered into the routing table and then

How the community answered

(53 responses)
  • A
    2% (1)
  • B
    89% (47)
  • C
    4% (2)
  • D
    6% (3)

Why each option

After creating a class map to identify high-priority traffic, the engineer must attach this class map to a policy map that defines the specific QoS actions to be taken on that traffic.

AAttach the class map to a policy map that sets the minimum bandwidth allocated to the classified

Setting minimum bandwidth is one type of action within a policy map, but choice B is more general and accurately describes the overarching function of a policy map after classification-to designate *the* action.

BAttach the class map to a policy map that designates the action to be taken on the classifiedCorrect

Once traffic is classified using a class map, the next crucial step in implementing a Quality of Service (QoS) policy is to define how that classified traffic should be handled. This is done by attaching the class map to a policy map, which serves as a container for specifying various QoS actions such as prioritizing, shaping, policing, or remarking the identified high-priority traffic. The policy map is where the actual service treatment for the classified traffic is designated.

CAttach the class map to a policy map within a VRF to segregate the high-priority traffic and then

Attaching a class map to a policy map within a VRF for traffic segregation is not the typical or immediate next step for general QoS policy implementation; VRFs provide routing table separation.

DCreate a route map to manipulate the routes that are entered into the routing table and then

Creating a route map is used for manipulating routing information and influencing route selection, not for applying QoS policies to traffic flows.

Concept tested: QoS Policy Implementation (Class-Map, Policy-Map)

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/15-mt/qos-plcshp-15-mt-book/qos-policing-and-shaping.html

Topics

#QoS#Class-map#Policy-map#Traffic Prioritization

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