350-401 Question 50
Select 3You are designing a Cisco SD-Access network for a large enterprise. The customer has asked you to explain how traffic forwarding is managed within the SD-Access fabric. Which of the following elements are responsible for the control and data plane operations in Cisco SD-Access?
- A
Control plane node
- B
Edge node
- C
Intermediate node
- D
Fabric border node
- E
Policy plane node
Show answer and explanation
Correct answers: A, B, D
Explanation
In Cisco SD-Access, the control plane (managed by the control plane node) uses LISP to map endpoint identifiers to routing locators. The data plane (handled by edge and border nodes) uses VXLAN to encapsulate traffic within the fabric. Intermediate nodes provide underlay connectivity but do not perform SD-Access-specific functions, and 'policy plane node' is not a valid component.
- A. Correct.
The control plane node is responsible for maintaining the LISP mapping database, which resolves endpoint identifiers (EIDs) to routing locators (RLOCs). This is critical for SD-Access control plane operations.
- B. Correct.
The edge node is a key data plane element that connects endpoints to the SD-Access fabric. It is responsible for encapsulating and forwarding traffic using the VXLAN protocol.
- C. Incorrect.
The intermediate node is part of the underlay network and provides IP connectivity within the fabric. However, it does not participate directly in SD-Access-specific control or data plane operations.
- D. Correct.
The fabric border node is crucial for data plane operations as it provides the gateway between the SD-Access fabric and external networks, enabling traffic forwarding in and out of the fabric.
- E. Incorrect.
The policy plane node is not a valid SD-Access node type, as policy enforcement is handled by the fabric edge nodes and the Cisco DNA Center.