Which function does a fabric edge node perform in an SD-Access deployment?

Question

Options

• AConnects the SD-Access fabric to another fabric or external Layer 3 networks
• BConnects endpoints to the fabric and forwards their traffic
• CProvides reachability border nodes in the fabric underlay
• DEncapsulates end-user data traffic into LISP.

• B
  89% (25)
• C
  4% (1)
• D
  7% (2)

Explanation

SD-Access Fabric Edge Node Explanation

A fabric edge node sits at the access layer of the SD-Access architecture and serves as the point where end devices (endpoints) connect to the network. It is responsible for onboarding endpoints, registering their location with the control plane (LISP map server), and forwarding their traffic across the fabric using VXLAN encapsulation - making Option B correct.

Why the distractors are wrong:

• Option A describes a fabric border node, which is the gateway connecting the SD-Access fabric to external networks or other fabrics.
• Option C is incorrect because underlay reachability is handled by the fabric underlay infrastructure (typically running IS-IS), not a specific "border node" role in the overlay.
• Option D is misleading - while LISP is used in SD-Access, it is the control plane protocol for location/identity mapping; actual end-user data traffic is encapsulated in VXLAN, not LISP itself.

Memory Tip: Think of the edge node as the "front door" of the fabric - it's where users and devices enter the network. Border nodes are the "back door" connecting to the outside world. Edge = Endpoints, Border = Beyond.

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