350-401 Question #1273: Real Exam Question with Answer & Explanation

Question

In a Cisco SD-Access wireless architecture, which device is responsible for maintaining the endpoint ID database?

Options

• Afabric border node
• Bfabric edge node
• Cfabric wireless controller
• Dfabric plane node

Explanation

SD-Access Wireless Architecture: Endpoint ID Database

In Cisco SD-Access, the fabric control plane node (option D) is responsible for maintaining the endpoint ID database, which maps endpoint identifiers (EIDs) to their routing locators (RLOCs) using the LISP (Locator/ID Separation Protocol) mapping system - this is fundamental to how the fabric knows where endpoints are located at any given time.

Why the distractors are wrong:

• Fabric Border Node (A) connects the SD-Access fabric to external networks (like the internet or WAN) but does not maintain the endpoint database
• Fabric Edge Node (B) is the access layer switch where endpoints connect and registers endpoints to the control plane, but it does not maintain the database itself
• Fabric Wireless Controller (C) manages wireless APs and client policies within the fabric but is not responsible for endpoint ID storage

💡 Memory Tip: Think of the Control Plane Node as the "phone book" of the fabric - edge nodes "look up" endpoint locations by querying it, and border nodes use it when routing traffic in or out. The word "control" = "database control" over who is where in the network.

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