Which filter is associated with Relay-Agent Option-82 (Circuit Switched Networks)?

• A. MAC Address Filter
• B. Option Filter
• C. NAC Filter
• D. Relay Agent Filter

Answer: (D)

Relay Agent Information option 82 is used in circuit-switched networks to carry the relay’s location data to the DHCP server. To apply policies or assign addresses based on that relay-provided information, you use a filter designed specifically for the Relay Agent Information data. The Relay Agent Filter examines the data carried in the Relay Agent Information option (such as circuit ID and remote ID) and applies the appropriate DHCP scope or policy. Other filters focus on a device’s MAC address, generic DHCP options, or NAC-related data, and they don’t directly target the relay agent’s option 82 data, which is why they aren’t the right fit for this scenario.