300-420 Question 146
Select 3An organization is designing a Cisco SD-Access network for both wired and wireless access. The design must ensure seamless connectivity, support for scalable segmentation, and integration with multicast applications. Which considerations are most important when designing the SD-Access fabric for this deployment?
- A
Ensure the control plane uses LISP to manage endpoint identity-to-location mapping.
- B
Design the fabric border to support seamless Layer 3 handoff for external connectivity.
- C
Implement VLAN-based segmentation within the underlay instead of leveraging virtual networks in the overlay.
- D
Enable multicast replication in the underlay to support applications that rely on multicast traffic.
- E
Ensure the wireless LAN controllers (WLCs) integrate with the fabric for wireless to enable consistent policy enforcement.
Show answer and explanation
Correct answers: A, B, E
Explanation
Cisco SD-Access fabric design for wired and wireless access requires careful consideration of control plane design, border design, and integration of wireless components. LISP is the control plane protocol used to manage identity-to-location mappings efficiently, while the fabric border is crucial for Layer 3 handoff to external networks. Additionally, integrating wireless LAN controllers with the SD-Access fabric ensures end-to-end policy consistency across wired and wireless devices. Traditional VLAN-based segmentation and underlay multicast replication are not applicable to SD-Access, as it relies on the overlay fabric for these functionalities.
- A. Correct.
The control plane in SD-Access uses LISP (Locator/ID Separation Protocol) to map endpoint identities to their locations, ensuring efficient routing and scalability.
- B. Correct.
The fabric border must be designed to support Layer 3 handoff to external networks, critical for connectivity to non-fabric networks or the internet.
- C. Incorrect.
VLAN-based segmentation is part of the traditional network model and is not used in SD-Access. SD-Access leverages virtual networks (VN) in the overlay for scalable and policy-based segmentation.
- D. Incorrect.
Multicast replication is handled in the overlay within SD-Access, not in the underlay. Multicast traffic is optimized using the fabric's inherent capabilities.
- E. Correct.
Integrating the wireless LAN controllers with the fabric ensures that wireless endpoints can seamlessly access the SD-Access policies and benefits, enabling consistent policy enforcement.