300-415 Question #147: Real Exam Question with Answer & Explanation

The correct answer is B: IGP. For a WAN Edge router to initially connect to controllers located in a data center, basic IP reachability is required, which is typically established via an Interior Gateway Protocol (IGP) in the underlying transport network.

WAN Edge Router Deployment

Question

What is a requirement for a WAN Edge to reach vManage, vBond, and vSmart controllers in a data center?

Options

AOMP
BIGP
CQoS
DTLS

Explanation

For a WAN Edge router to initially connect to controllers located in a data center, basic IP reachability is required, which is typically established via an Interior Gateway Protocol (IGP) in the underlying transport network.

Common mistakes.

A. OMP (Overlay Management Protocol) is used for exchanging routing and policy information within the SD-WAN overlay, not for establishing underlying IP reachability to the controllers themselves.
C. QoS (Quality of Service) is used for traffic prioritization and management, not for establishing the fundamental IP reachability between network devices and controllers.
D. TLS (Transport Layer Security) is used to secure the control plane connections after IP reachability is established, but it does not provide the underlying network reachability itself.

Concept tested. Controller reachability requirements (underlay)

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-config-guide/cisco-sd-wan-gs-config-guide-xe-17-x/sd-wan-overlay-network-bringup.html

Topics

#WAN Edge connectivity#SD-WAN controllers#Underlay routing#IGP

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