Which technology is used to provide Layer 2 and Layer 3 logical networks in the Cisco SD- Access architecture?

Question

Options

• Aunderlay network
• BVPN routing/forwarding
• Ceasy virtual network
• Doverlay network

• A
  3% (1)
• B
  5% (2)
• C
  3% (1)
• D
  89% (33)

Explanation

Overlay Network in Cisco SD-Access

In Cisco SD-Access, the overlay network is the technology responsible for creating virtual Layer 2 and Layer 3 logical networks on top of the physical infrastructure, using VXLAN (Virtual Extensible LAN) for data plane encapsulation and LISP for control plane operations - enabling seamless segmentation and mobility across the fabric.

Why the distractors are wrong:

• A (Underlay network): The underlay is the physical IP infrastructure that supports the overlay; it provides connectivity but does not create logical L2/L3 networks itself.
• B (VPN routing/forwarding - VRF): VRFs are a component used within the SD-Access overlay for segmentation, but they are not the overarching technology providing L2/L3 logical networks.
• C (Easy Virtual Network - EVN): EVN is a legacy Cisco IOS virtualization technology that predates SD-Access and is not the mechanism SD-Access uses for logical networking.

Memory Tip: Think of it this way - the underlay is the "road" (physical), while the overlay is the "GPS route" (logical) drawn on top. SD-Access uses the overlay to define where traffic goes logically, independent of the physical path.

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