In a three-tier campus design, which action is a core-layer best practice?

The core layer in a three-tier campus design is responsible for high-speed packet forwarding and acts as the backbone. Using redundant Layer 3 point-to-point links between core devices ensures predictable and fast convergence in case of a link failure, which is crucial for maintaining network uptime and performance. QoS prioritization, 802.1X, DHCP snooping, VACLs, and port security are typically implemented at the access layer to control user access and apply security policies. Redundant aggregation for access layer devices and first-hop redundancy protocols like VRRP are functions of the distribution (aggregation) layer, which connects the access layer to the core and provides policy-based connectivity.