Required Configuration Components for QoS Policies on Cisco Routers Using MQC
Question
Which three configuration components are required to implement QoS policies on Cisco routers using MQC? (Choose three.)
Answers
Explanations
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A. B. C. D. E.ACD.
The correct answers are A. class-map, C. policy-map, and D. service-policy.
Explanation: Quality of Service (QoS) is the ability to provide preferential treatment to specific traffic flows over other traffic flows in a network. QoS can be implemented using the Modular QoS Command-Line Interface (MQC) on Cisco routers. The MQC allows administrators to define traffic classes, policy maps, and service policies to implement QoS policies on a router.
Here are the three required configuration components to implement QoS policies on Cisco routers using MQC:
Class-Map: A class-map defines a traffic class based on specific criteria such as source/destination IP address, protocol, port numbers, or other Layer 3/4 criteria. Traffic flows that match the criteria are classified into the traffic class. Multiple traffic classes can be defined using multiple class-maps.
Policy-Map: A policy-map is used to define QoS policies for one or more traffic classes. It maps the traffic classes defined in class-maps to specific actions or behaviors using a set of policy statements. These policy statements specify the QoS actions to be taken on the traffic flows that match the corresponding traffic classes.
Service-Policy: A service-policy is used to apply a policy-map to a specific interface, direction (input/output), and traffic direction (inbound/outbound). It binds the policy-map to the interface and specifies the QoS actions to be taken on the matched traffic classes.
Therefore, to implement QoS policies on Cisco routers using MQC, you need to define one or more class-maps to classify traffic, one policy-map to specify QoS policies for each traffic class, and one or more service-policies to apply the policy-map(s) to the appropriate interface(s) and direction(s).
Option B "global-policy" and option E "inspect-map" are not required components to implement QoS policies using MQC. "global-policy" is not a valid MQC component, and "inspect-map" is used for traffic inspection and classification, not QoS policies.
