300-415 Question #77: Real Exam Question with Answer & Explanation

The correct answer is D: TLOC extension. TLOC extension builds transport redundancy by allowing a WAN Edge router without a direct WAN link to share the TLOC of an adjacent WAN Edge router via a cross-connect link.

WAN Edge Router Deployment

Question

Which feature-builds transport redundancy by using the cross link between two redundant WAN Edge routers?

Options

AOMP
Bzero-touch provisioning
Cquality of service
DTLOC extension

Explanation

TLOC extension builds transport redundancy by allowing a WAN Edge router without a direct WAN link to share the TLOC of an adjacent WAN Edge router via a cross-connect link.

Common mistakes.

A. OMP is the SD-WAN overlay routing protocol responsible for distributing routes and TLOC reachability; it does not provide the cross-link transport redundancy mechanism between co-located routers.
B. Zero-touch provisioning automates the onboarding of new devices to the SD-WAN fabric and is entirely unrelated to transport redundancy between co-located branch routers.
C. Quality of service prioritizes traffic types within existing tunnels and does not create or extend transport redundancy between routers sharing a WAN connection.

Concept tested. TLOC extension for WAN Edge transport redundancy

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/system-interface/ios-xe-17/systems-interfaces-book-xe/tloc-extension.html

Topics

#TLOC extension#WAN Edge redundancy#Transport redundancy

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