300-420 Question #56: Real Exam Question with Answer & Explanation

Question

What is the purpose of an edge node in an SD-Access network fabric?

Options

• AEdge nodes identify and authenticate endpoints and register endpoint information with control
• BEdge nodes track endpoint IDs to location mappings, along with IPv4, IPv6, or MAC addresses.
• CEdge nodes are the gateway between the fabric domain and network outside of the fabric.
• DEdge nodes resolve lookup requests from edge and border nodes to locate destination endpoint

Explanation

An SD-Access edge node serves as the entry point for endpoints into the fabric, handling their identification and authentication before registering their location information.

Common mistakes.

• B. Tracking endpoint IDs to location mappings (along with their addresses) is primarily the function of the control plane node (LISP Map-Server/Map-Resolver) in an SD-Access network, not the edge node.
• C. The role of providing a gateway function between the SD-Access fabric domain and external networks (like the WAN, Internet, or shared services) is performed by a border node, not an edge node.
• D. Resolving lookup requests from other nodes to locate destination endpoints is a core responsibility of the control plane node, which maintains the LISP mapping system, not the edge node.

Concept tested. SD-Access Edge Node role and functions

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#_roles_in_the_sd_access_fabric

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