350-401 Question #661: Real Exam Question with Answer & Explanation

Question

What is one characteristic of the Cisco SD-Access control plane?

Options

• AIt is based on VXLAN technology.
• BEach router processes every possible destination and route
• CIt allows host mobility only in the wireless network.
• DIt stores remote routes in a centralized database server

Explanation

Cisco SD-Access Control Plane Explanation

In Cisco SD-Access, the control plane is built on LISP (Locator/ID Separation Protocol), which uses a centralized Map Server/Map Resolver (MS/MR) to store endpoint location (EID-to-RLOC mappings) in a central database, rather than distributing routing information to every device - making D correct.

Why the distractors are wrong:

• A is incorrect because VXLAN is the data plane (encapsulation) technology in SD-Access, not the control plane.
• B describes traditional distributed routing behavior, which SD-Access specifically moves away from by centralizing endpoint information.
• C is incorrect because SD-Access supports host mobility for both wired and wireless endpoints, which is one of its key advantages.

🧠 Memory Tip: Think of the SD-Access control plane as a "phone book server" - instead of every router memorizing every address, they all look up endpoint locations from one central LISP database. Control = LISP (centralized), Data = VXLAN (encapsulation), Policy = TrustSec (SGT) - memorize this trio and you'll handle most SD-Access questions with confidence.

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