300-420 Question 144
Select 3An organization is designing a Cisco SD-Access fabric to support both wired and wireless endpoints. The design must ensure seamless integration between the overlay and underlay networks, enable segmentation for different business units, and support scalability for future growth. Which considerations should be included in the fabric design?
- A
Ensure the control plane leverages LISP for endpoint-to-VNID mapping and scalability.
- B
Design the border node to provide connectivity to external networks and enforce VRF-aware routing.
- C
Implement multicast routing only in the overlay to reduce underlay complexity.
- D
Configure virtual networks (VNs) to segment traffic for different business units.
- E
Use a single VLAN for all wireless traffic to simplify the overlay design.
Show answer and explanation
Correct answers: A, B, D
Explanation
When designing an SD-Access fabric, it is crucial to consider the control plane, border node functionality, and segmentation using virtual networks. LISP ensures efficient control plane operations, and VRF-aware routing at the border node allows secure external connectivity. Properly configuring virtual networks supports traffic isolation for business units. Multicast routing must be implemented in both overlay and underlay layers to support wireless traffic and optimize overall traffic flows.
- A. Correct.
Correct: The Locator/ID Separation Protocol (LISP) is a critical component in SD-Access control plane design, enabling endpoint-to-VNID mapping and scalability.
- B. Correct.
Correct: The border node serves as the gateway between the SD-Access fabric and external networks, enforcing VRF-aware routing for segmentation.
- C. Incorrect.
Incorrect: Multicast routing is required in both the overlay and underlay to support features like wireless multicast traffic and optimize traffic flows.
- D. Correct.
Correct: Virtual networks (VNs) are a key SD-Access feature for segmenting traffic based on business requirements, improving security and traffic isolation.
- E. Incorrect.
Incorrect: Using a single VLAN for all wireless traffic undermines segmentation and scalability, which are core principles in SD-Access design.