300-420 · Question #56
What is the purpose of an edge node in an SD-Access network fabric?
The correct answer is A. Edge nodes identify and authenticate endpoints and register endpoint information with control. 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.
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
How the community answered
(49 responses)- A92% (45)
- B2% (1)
- C2% (1)
- D4% (2)
Why each option
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.
Edge nodes are the initial point of connection for wired and wireless endpoints within the SD-Access fabric, where they perform crucial functions such as identifying, authenticating, and authorizing these endpoints, and then registering their ID-to-location mappings with the control plane node.
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.
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.
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
Source: 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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