300-415 Question #261: Real Exam Question with Answer & Explanation

Question

Options

• ACONFIGURATION | POLICIES Localized Policy > Route Policy (Add and Configure a Route Policy)
• BCONFIGURATION | POLICIES Centralized Policy > Application Aware Routing Policy (Create an application-aware routing policy)
• CCONFIGURATION | POLICIES Localized Policy > Forwarding Class/QoS (Add and Configure a QoS Map)
• DCONFIGURATION | POLICIES Localized Policy > Access Control List Policy (Add Access Control List Policy, Add Device Access Policy)
• ECONFIGURATION | POLICIES Centralized Policy > Data Policy (Create a data policy)

Explanation

To identify and remark DSCP 26 traffic to DSCP 18 on a WAN Edge router, an engineer can configure a localized QoS Map or an Access Control List policy with remarking actions.

Common mistakes.

• A. A Route Policy is primarily used to influence routing decisions and manipulate route attributes, not to modify packet-level DSCP values on a local interface.
• B. An Application Aware Routing Policy is a centralized policy used for dynamic path selection across the SD-WAN fabric based on application SLAs, not for localized DSCP remarking.
• E. A Centralized Data Policy is used to control data plane traffic flow across the entire SD-WAN fabric, but it is not typically employed for localized ingress or egress DSCP remarking on an individual WAN Edge router.

Concept tested. Localized QoS/ACL DSCP remarking

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-release-17/sd-wan-quality-of-service/sd-wan-quality-of-service-book.html

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