An engineer must design Layer 2 connectivity for a subnet between two data centers. The engineer must ensure seamless host mobility and optimal first-hop routing. Which attribute must be synchronized across all data centers to achieve this goal?
D is correct.
Anycast Gateway MAC: This concept allows multiple data centers to present a single Layer 2 gateway MAC address to hosts, even though the gateways might reside in different physical locations. The anycast MAC address is configured on multiple routers or switches across different data centers, and the routing protocol ensures that the host always communicates with the closest or best-performing gateway. This setup enables seamless mobility for hosts as they move between different data centers (since the gateway MAC remains the same across data centers), and also provides optimal first-hop routing by ensuring that traffic is routed to the nearest available gateway.
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