350-401 Question #18: Real Exam Question with Answer & Explanation

Question

Which description of an SD-Access wireless network infrastructure deployment is true?

Options

• AThe access point is part of the fabric underlay.
• BThe WLC is part of the fabric underlay.
• CThe access point is part the fabric overlay.
• DThe wireless client is part of the fabric overlay.

Explanation

SD-Access Wireless Network Infrastructure Explanation

In SD-Access fabric deployments, Access Points (APs) are considered fabric nodes and operate as part of the fabric overlay, acting as the point where wireless clients' traffic is encapsulated into VXLAN and injected into the fabric. This means the AP performs the VXLAN encapsulation/decapsulation function, making it a fabric edge node within the overlay.

Why the distractors are wrong:

• Option A is incorrect because APs are not part of the underlay (the underlay consists of the physical network infrastructure like routers and switches providing IP connectivity)
• Option B is incorrect because the WLC (Wireless LAN Controller) in SD-Access operates in a centralized control-plane role and integrates with the fabric control plane (via DNA Center/Cisco ISE), but is not a fabric underlay component
• Option D is incorrect because wireless clients are endpoints attached to the fabric overlay, but are not part of it - they sit outside the fabric boundary, with the AP serving as their fabric entry point

Memory Tip: Think of it this way - "APs are the wireless fabric edge nodes". Just as a wired edge switch encapsulates traffic into VXLAN for wired clients, the AP does the same job for wireless clients, placing it firmly in the overlay.

No community discussion yet for this question.