350-401 Question 114
Single answerAn enterprise network engineer is deploying VXLAN in a data center to enable Layer 2 extension over a Layer 3 network. During the configuration, the engineer needs to decide between using a multicast-based approach or unicast-based VXLAN with EVPN. Which of the following is a key advantage of using VXLAN with EVPN compared to a multicast-based VXLAN deployment?
- A
VXLAN with EVPN eliminates the need for multicast configurations in the underlay network.
- B
VXLAN with EVPN requires less overhead for the control plane compared to multicast-based VXLAN.
- C
VXLAN with EVPN supports seamless integration with legacy VLAN configurations without additional hardware.
- D
VXLAN with EVPN enables better scalability by providing control-plane learning for MAC address distribution.
Show answer and explanation
Correct answer: A
Explanation
VXLAN with EVPN replaces the need for multicast in the underlay network by introducing a control-plane mechanism via BGP for MAC address learning and endpoint discovery. This makes it easier to deploy and scale in networks where multicast support is limited or undesirable.
- A. Correct.
Correct. VXLAN with EVPN eliminates the need for multicast in the underlay network by leveraging unicast traffic and a BGP-based control plane for MAC address learning and endpoint discovery.
- B. Incorrect.
Incorrect. VXLAN with EVPN uses a BGP-based control plane, which introduces additional overhead compared to the data-plane MAC learning in multicast-based VXLAN.
- C. Incorrect.
Incorrect. VXLAN with EVPN does not inherently improve legacy VLAN integration; it is primarily designed for scalable Layer 2/3 extension in modern networks.
- D. Incorrect.
Incorrect. While VXLAN with EVPN does enhance scalability, the key comparison point in this scenario is the elimination of multicast dependency in the underlay.