300-420 Question 147
Select 3An enterprise network engineer is designing an SD-Access fabric for a large organization with both wired and wireless users. The design must ensure proper segmentation of different business units, scalability for future expansion, and seamless integration of wireless access points into the fabric. Which of the following design considerations should the engineer prioritize?
- A
Implement virtual networks (VNs) to segment traffic for different business units.
- B
Design the control plane using eBGP to maximize scalability.
- C
Use Fabric Border Nodes to define the boundary between the SD-Access fabric and external networks.
- D
Ensure the wireless LAN controllers (WLCs) are integrated into the fabric control plane.
- E
Enable multicast within the fabric to support efficient wireless client roaming.
Show answer and explanation
Correct answers: A, C, D
Explanation
To design an SD-Access fabric for both wired and wireless access, engineers must focus on proper traffic segmentation using Virtual Networks (VNs), seamless integration of Fabric Border Nodes to define the SD-Access fabric's boundaries, and ensuring wireless LAN controllers (WLCs) are part of the fabric control plane. These elements enable scalable, segmented, and unified management of both wired and wireless users. While multicast and eBGP may play a role in specific scenarios, they are not key considerations for this design use case.
- A. Correct.
Virtual Networks (VNs) are essential for segmenting traffic within SD-Access. Each VN can represent a department or business unit, ensuring proper isolation and segmentation for security and policy enforcement.
- B. Incorrect.
While scalability is critical, eBGP is not typically used for the control plane in SD-Access. Cisco SD-Access uses LISP (Locator/ID Separation Protocol) as the control plane protocol to handle endpoint-to-location mapping efficiently.
- C. Correct.
Fabric Border Nodes are critical design components that define the boundary between the SD-Access fabric and external networks. They handle traffic entering and exiting the fabric and are essential for proper integration with external domains.
- D. Correct.
Wireless LAN controllers (WLCs) must be integrated into the fabric control plane to ensure seamless wireless access. This allows wireless devices to participate in the same fabric as wired devices, enabling unified policy and segmentation.
- E. Incorrect.
Multicast in SD-Access is not a mandatory requirement for efficient wireless client roaming. Instead, wireless roaming is handled by other mechanisms within the SD-Access architecture, such as fabric-enabled wireless capabilities.