In DHCP, what are scopes, exclusions, and lease times?

• A. Scopes define the address range; exclusions reserve addresses; lease times define how long an IP is valid.
• B. Scopes are DNS zones.
• C. Exclusions set aside addresses for servers outside the pool.
• D. Lease times define port assignment.

Answer: (A)

In DHCP, these terms describe how IP addresses are managed and handed out. A scope is a defined range of IP addresses that the DHCP server can assign to clients. Exclusions are specific addresses within that range that are reserved and not handed out, typically for devices like routers, printers, or servers. Lease time is how long a given IP address is allocated to a client before the client must renew the lease or the address becomes available again.

For example, a scope might cover 192.168.1.100 to 192.168.1.200, with exclusions for 192.168.1.1 (gateway) and 192.168.1.150 (printer). A 24-hour lease means each assigned IP is valid for 24 hours before renewal is needed.

The other statements don’t fit because scopes aren’t DNS zones, exclusions aren’t used to reserve addresses outside the pool, and lease times aren’t about port assignments.