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300-420 · Question #246

What is the purpose of a TLOC extension in a Cisco SD-WAN network fabric?

The correct answer is A. to facilitate WAN Edge router redundancy within a site. A TLOC extension in SD-WAN allows a second WAN Edge router at a site to use another router's WAN transport link, enabling local redundancy without requiring a separate WAN circuit.

WAN for Enterprise Networks

Question

What is the purpose of a TLOC extension in a Cisco SD-WAN network fabric?

Options

  • Ato facilitate WAN Edge router redundancy within a site
  • Bto identify the physical interface where a WAN Edge router connects to the WAN transport
  • Cto expand the number of colors that are potentially applied to a network transport interface
  • Dto aggregate multiple physical Interfaces into a single logical interface

How the community answered

(21 responses)
  • A
    86% (18)
  • B
    10% (2)
  • C
    5% (1)

Why each option

A TLOC extension in SD-WAN allows a second WAN Edge router at a site to use another router's WAN transport link, enabling local redundancy without requiring a separate WAN circuit.

Ato facilitate WAN Edge router redundancy within a siteCorrect

A TLOC extension connects a secondary WAN Edge router to a primary WAN Edge router over a LAN-side link, allowing the secondary router to share the primary's WAN transport and participate in SD-WAN tunnels. This provides router-level redundancy at a site with a single WAN circuit, ensuring traffic continuity if the primary router fails.

Bto identify the physical interface where a WAN Edge router connects to the WAN transport

The TLOC itself (Transport Location) identifies the physical WAN interface, IP address, encapsulation, and color of a WAN Edge router, which is a different concept from a TLOC extension.

Cto expand the number of colors that are potentially applied to a network transport interface

Colors are labels applied to WAN transport interfaces to categorize transport types; TLOC extensions do not expand or modify color assignments.

Dto aggregate multiple physical Interfaces into a single logical interface

Aggregating multiple physical interfaces into a single logical interface describes link aggregation (LAG/port-channel), which is unrelated to TLOC extensions.

Concept tested: Cisco SD-WAN TLOC extension for site redundancy

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/system-overview.html

Topics

#SD-WAN#TLOC Extension#Redundancy#High Availability

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