Comprehensive and Detailed 200 to 250 words of Explanation From HCIP Datacom Campus Network documents knowledge without any URL or Links:
DHCP snooping works by distinguishing trusted and untrusted interfaces and controlling DHCP message forwarding behavior. After DHCP snooping is enabled, interfaces connected tolegal DHCP servers must be explicitly configured as trusted interfaces, otherwise DHCP server messages will be blocked. Therefore, statementB is correct.
On untrusted interfaces, the switchdrops DHCP server–type messages, such as DHCP Offer and DHCP ACK, to prevent rogue DHCP servers from assigning incorrect IP addresses. This validatesstatement C as correct.
Statement A is incorrect because DHCP snooping records client binding information mainly fromDHCP ACK messages, not from DHCP Offer messages. The ACK confirms the final IP assignment and lease parameters, making it the authoritative source for the binding table.
Statement D is also incorrect. When the interface connected to a DHCP client goes down, the corresponding DHCP snooping entry is immediately removed, rather than waiting for the lease to expire. This ensures real-time accuracy of the binding table.
