Question 231 of 1,420
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350-401 Practice Question: Which three statements about Cisco SD-Access…
Which three statements about Cisco SD-Access design are true? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VXLAN is used as the data plane encapsulation in SD-Access to create overlay tunnels.
Cisco SD-Access is a policy-based, intent-driven network architecture that uses VXLAN for overlay tunneling and LISP for control plane. It separates the network into fabric and non-fabric domains. The fabric uses a border node to connect to external networks. Option A is correct because VXLAN provides the data plane encapsulation. Option C is correct because LISP is the control plane that maps endpoints to their locations. Option D is correct because the border node connects the fabric to outside networks (e.g., WAN, Internet). Option B is incorrect because the fabric edge is the access layer switch that connects endpoints, not the border. Option E is incorrect because SD-Access typically uses a two-tier spine-leaf design, not a three-tier core-distribution-access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VXLAN is used as the data plane encapsulation in SD-Access to create overlay tunnels.
Why this is correct
Correct because VXLAN encapsulates Layer 2 frames in UDP packets, enabling overlay networks across the underlay.
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The fabric border node is the access layer switch that connects end devices to the network.
Why it's wrong here
Incorrect because the fabric edge connects endpoints; the border connects the fabric to external networks.
- ✓
LISP provides the control plane for SD-Access by managing endpoint identifiers and routing locators.
Why this is correct
Correct because LISP separates endpoint identity (EID) from location (RLOC), enabling scalable mobility and policy.
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The border node provides connectivity between the SD-Access fabric and traditional networks or the WAN.
Why this is correct
Correct because the border node acts as the gateway between the fabric and external networks, applying policies.
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SD-Access requires a three-tier hierarchical design with core, distribution, and access layers.
Why it's wrong here
Incorrect because SD-Access uses a spine-leaf (two-tier) design for the fabric underlay, not a traditional three-tier model.
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Last reviewed: Jun 18, 2026
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