350-401 Question 51
Select 2An organization has deployed Cisco SD-Access to simplify network management and improve security. The network administrator wants to understand how the control and data plane elements work within the SD-Access fabric. Which of the following statements accurately describe the roles of control and data planes in Cisco SD-Access?
- A
The control plane leverages LISP to maintain endpoint-to-location mappings within the fabric.
- B
The control plane is responsible for forwarding user traffic between fabric edge nodes.
- C
The data plane in Cisco SD-Access uses VXLAN encapsulation to transport data between fabric nodes.
- D
The data plane relies on OSPF to establish routing within the fabric.
- E
The control plane is implemented using the fabric border node, which manages external connectivity.
Show answer and explanation
Correct answers: A, C
Explanation
In Cisco SD-Access, the control plane is responsible for endpoint-to-location mapping using LISP, while the data plane uses VXLAN encapsulation for traffic forwarding between fabric nodes. These two elements together enable efficient and scalable traffic management within the fabric. Understanding their distinct roles is crucial for managing and troubleshooting SD-Access deployments.
- A. Correct.
Correct. The control plane in Cisco SD-Access uses the Locator/ID Separation Protocol (LISP) to map endpoint identifiers to their locations within the SD-Access fabric. This enables efficient communication and mobility.
- B. Incorrect.
Incorrect. Forwarding user traffic between fabric edge nodes is a function of the data plane, not the control plane.
- C. Correct.
Correct. The data plane in SD-Access uses VXLAN (Virtual Extensible LAN) encapsulation to carry traffic between fabric nodes. VXLAN provides layer 2 and layer 3 connectivity over an IP-based underlay network.
- D. Incorrect.
Incorrect. The data plane does not rely on OSPF for routing; instead, it uses VXLAN encapsulation for transport. OSPF may be used in the underlay network but is not directly part of the SD-Access data plane.
- E. Incorrect.
Incorrect. While the fabric border node does manage external connectivity, it is part of the fabric infrastructure and not the control plane itself. The control plane functions are primarily implemented using LISP.