nerdexam
Cisco

300-415 · Question #261

An engineer must configure the SD-WAN Edge router to identify DSCP 26 traffic coming from the router's local site and then change the DSCP value to DSCP 18 before sending it over to the SD-WAN…

The correct answer is C. CONFIGURATION | POLICIES Localized Policy > Forwarding Class/QoS (Add and Configure a QoS Map) D. CONFIGURATION | POLICIES Localized Policy > Access Control List Policy (Add Access Control List Policy, Add Device Access Policy). 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.

Policies

Question

An engineer must configure the SD-WAN Edge router to identify DSCP 26 traffic coming from the router's local site and then change the DSCP value to DSCP 18 before sending it over to the SD-WAN fabric. What are the two ways to create the required configuration? (Choose two.)

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)

How the community answered

(53 responses)
  • A
    4% (2)
  • B
    15% (8)
  • C
    74% (39)
  • E
    8% (4)

Why each option

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.

ACONFIGURATION | POLICIES Localized Policy > Route Policy (Add and Configure a Route Policy)

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.

BCONFIGURATION | POLICIES Centralized Policy > Application Aware Routing Policy (Create an application-aware routing policy)

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.

CCONFIGURATION | POLICIES Localized Policy > Forwarding Class/QoS (Add and Configure a QoS Map)Correct

A localized QoS Map policy allows an engineer to define forwarding classes, classify ingress traffic based on DSCP 26, and then configure a rewrite rule within the policy to change the DSCP value to 18 before the traffic is sent over the SD-WAN fabric.

DCONFIGURATION | POLICIES Localized Policy > Access Control List Policy (Add Access Control List Policy, Add Device Access Policy)Correct

A localized Access Control List (ACL) policy can be configured to match traffic with DSCP 26 and apply a 'remark' action to set the DSCP value to 18. This ACL is then applied to the relevant interface of the WAN Edge router.

ECONFIGURATION | POLICIES Centralized Policy > Data Policy (Create a data policy)

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

Source: 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

Topics

#DSCP Remarking#Localized Policy#QoS#Access Control List

Community Discussion

No community discussion yet for this question.

Sign up to join the discussion
Full 300-415 Practice