352-001 Question #608: Real Exam Question with Answer & Explanation

The correct answer is C: VPLS. VPLS is the DCI technology that uses the traditional flood-and-learn mechanism to build its Layer 2 MAC forwarding tables across the provider core.

Question

Which DCI technology utilizes a "flood and learn" technique to populate the Layer 2 forwarding table?

Options

AOTV
BE-VPN
CVPLS
DLISP

Explanation

VPLS is the DCI technology that uses the traditional flood-and-learn mechanism to build its Layer 2 MAC forwarding tables across the provider core.

Common mistakes.

A. OTV uses a control-plane mechanism based on IS-IS to advertise and learn MAC reachability across the DCI overlay, avoiding the need to flood traffic into the core.
B. EVPN distributes MAC and IP reachability information via BGP control-plane updates, eliminating data-plane flooding for remote MAC address learning.
D. LISP uses a map-request and map-reply control-plane protocol to resolve endpoint identifiers to routing locators and does not use flood-and-learn for Layer 2 forwarding.

Concept tested. VPLS flood-and-learn MAC learning in DCI

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l2_vpns/configuration/xe-16/mp-l2-vpns-xe-16-book/mp-vpls.html

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