Refer to the exhibit. A Cisco data center environment is implemented with vPC. The web server replies using the SVI MAC address as the Layer 2 header instead of the HSRP MAC address on VLAN 23. This…

ARP Sync synchronizes ARP entries between vPC peers, primarily for failover consistency, but does not address the issue of an endpoint using an SVI MAC instead of an HSRP MAC for routing.

Object Tracking monitors the state of network objects and triggers actions, typically for high availability, which is unrelated to the specific Layer 2 forwarding problem described.

L3 Peer Router generally refers to configuring routing protocols over the vPC peer-link and does not resolve the specific MAC address forwarding issue experienced by endpoints within the vPC domain.

The peer-gateway feature in Cisco vPC allows a vPC peer switch to act as the active gateway for packets addressed to the other vPC peer's HSRP or SVI MAC address. This prevents packet drops that occur when an endpoint uses the SVI MAC of the non-forwarding HSRP peer, which would otherwise trigger vPC loop prevention and stop traffic.