300-420 Question #140: Real Exam Question with Answer & Explanation

Question

What is the purpose of a Cisco SD-Access underlay network?

Options

• Ato abstract IP-based connectivity from physical connectivity
• Bto emulate LAN segments to transport Layer 2 frames over a Layer 3 network
• Cto establish physical connectivity between switches and routers
• Dto provide virtualization by encapsulating network traffic over IP tunnels

Explanation

The Cisco SD-Access underlay network's primary purpose is to establish fundamental physical and Layer 3 IP connectivity between network devices.

Common mistakes.

• A. Abstraction of IP-based connectivity from physical connectivity is a core function of the SD-Access overlay network, not the underlay.
• B. Emulating LAN segments and transporting Layer 2 frames over a Layer 3 network via encapsulation is a function of the SD-Access overlay network using VXLAN, not the underlay.
• D. Providing virtualization by encapsulating network traffic over IP tunnels (like VXLAN) is a key aspect of the SD-Access overlay network, not the underlying physical and IP infrastructure.

Concept tested. Cisco SD-Access underlay purpose

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/sda_design_guide/c_sda_design_guide_chapter.html#_Toc508824057

No community discussion yet for this question.