DHCP is a core protocol used in campus networks to automatically assign IP addresses and deliver network parameters to hosts, improving deployment efficiency and simplifying address management. DHCP messages include several fixed fields and anOptions field, which plays a critical role in parameter delivery.
Option A isfalse. Even if only gateway and DNS server information needs to be delivered to a client, the DHCP Offer messagemust carry the Options field. Default gateway and DNS server information are delivered through specific DHCP options, such as Option 3 (Router) and Option 6 (DNS Server). Without the Options field, these parameters cannot be conveyed to the client.
Option B is correct. The Options field in DHCP messages uses aTLV (Type-Length-Value)format, allowing flexible extension and supporting various network parameters, including NTP server addresses, wireless AC addresses, and log server addresses, which aligns with HCIP Datacom Campus Network descriptions.
Option C is also correct. DHCP supportsstatic IP address allocationby binding a specific IP address to a client’s MAC address. This is commonly used for printers, servers, or network devices that require fixed IP addresses.
Option D is correct as well. Because DHCP uses broadcast messages that cannot cross Layer 3 boundaries, aDHCP relay agentis required when the client and server reside on different IP networks.
Therefore, option A is the only incorrect statement.
