A transit authority wants the DHCP server to assign addresses based on which switch and port a rider Wi-Fi or kiosk attaches to. Which relay feature supplies that location context?
Select an answer to reveal the explanation.
Short Explanation
Option 82 is a sticky note the relay slaps on the DHCP request—‘this came from switch X port Y’—so the server can policy-pick the right pool without guessing.
Full Explanation
DHCP option 82 lets a relay agent insert circuit-id and remote-id information identifying the attachment point. Servers use that metadata for location-based pools and policy. DAI, multicast RP filters, and ERSPAN alone do not provide DHCP policy assignment by switch/port.