Which set of DHCP options are required for an IPv4 client to function on the network?

• A. Subnet-mask, Router, DNS-Servers, Lease-Time
• B. Subnet-mask only
• C. Router and DNS-Servers only
• D. Lease-Time only

Answer: (A)

DHCP must supply enough information for an IPv4 host to participate on the network: an address to use, the way to interpret that address on the local subnet, a path to reach destinations beyond that subnet, a way to resolve names, and a defined period for how long that address is valid. The IP address alone isn’t usable without the subnet mask, which tells the host which addresses are on‑link and which require routing. The router (default gateway) is needed so traffic destined for other networks has somewhere to be sent. DNS servers are provided so the host can convert human-friendly names to IP addresses when needed. The lease time establishes how long the provided IP address is valid before renewal or reallocation, keeping address management orderly.

The other options miss one or more of these essentials. One option only provides the subnet mask, which isn’t enough to actually communicate on the network. Another provides the router and DNS servers but omits the assigned IP and the lease lifecycle. The last provides only the lease time, missing the actual address and routing information.