300-420 · Question #140
What is the purpose of a Cisco SD-Access underlay network?
The correct answer is C. to establish physical connectivity between switches and routers. The Cisco SD-Access underlay network's primary purpose is to establish fundamental physical and Layer 3 IP connectivity between network devices.
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
How the community answered
(62 responses)- A2% (1)
- B8% (5)
- C85% (53)
- D5% (3)
Why each option
The Cisco SD-Access underlay network's primary purpose is to establish fundamental physical and Layer 3 IP connectivity between network devices.
Abstraction of IP-based connectivity from physical connectivity is a core function of the SD-Access overlay network, not the underlay.
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.
The SD-Access underlay network provides the physical cabling, Layer 2 adjacency, and Layer 3 IP routing infrastructure that ensures basic reachability for all fabric devices, upon which the overlay network is built.
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
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/sda_design_guide/c_sda_design_guide_chapter.html#_Toc508824057
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