300-420 · Question #242
Which function does the Cisco SD-Access intermediate node perform?
The correct answer is C. Route and transport IP traffic. The Cisco SD-Access intermediate node primarily functions to route and transport IP traffic within the underlay network, connecting other fabric nodes.
Question
Which function does the Cisco SD-Access intermediate node perform?
Options
- AAct as an anycast Layer 3 gateway.
- BMap users to a virtual network.
- CRoute and transport IP traffic.
- DAct as LISP proxy tunnel router.
How the community answered
(32 responses)- B3% (1)
- C94% (30)
- D3% (1)
Why each option
The Cisco SD-Access intermediate node primarily functions to route and transport IP traffic within the underlay network, connecting other fabric nodes.
The anycast Layer 3 gateway functionality in SD-Access is typically performed by the fabric edge nodes, which act as the first-hop gateway for endpoints.
Mapping users to a virtual network is primarily handled by the Cisco Identity Services Engine (ISE) and the fabric control plane (using LISP), not directly by an intermediate node.
In a Cisco SD-Access fabric, the intermediate node (typically a distribution or core layer switch) is part of the underlay network. Its main role is to provide IP routing and forwarding capabilities for the encapsulated traffic (VXLAN) between fabric edge nodes and border nodes, effectively transporting the IP traffic across the fabric.
LISP proxy tunnel router (xTR) functionality is associated with fabric edge nodes or border nodes for host mobility and external connectivity, not specifically with intermediate nodes.
Concept tested: Cisco SD-Access intermediate node role
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/sda_design_guide/sda_design_guide.html
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