Cisco CCNA (200-301)Network FundamentalsMedium
A network administrator needs to ensure that a critical server always receives the same IP address from the DHCP server. Which DHCP feature should the administrator configure?
- ADHCP relay
- BIP helper-address
- CDHCP reservation
- DDHCP exclusion
Show answer & explanationAnswer & explanation
Correct answer: C. DHCP reservation
DHCP reservation allows an administrator to map a specific IP address to a device's MAC address. This ensures that the DHCP server always assigns the same IP address to that particular device when it requests one.
Why the other options are wrong
- A. DHCP relay is used to forward DHCP requests between clients and a DHCP server located on a different subnet.
- B. IP helper-address is the Cisco IOS command used to configure DHCP relay on a router interface.
- D. DHCP exclusion prevents the DHCP server from assigning a specific range of IP addresses from its pool, but it doesn't guarantee a specific address to a specific device.
DHCP Reservation
DHCP reservation is a feature that allows a DHCP server to consistently assign the same IP address to a specific client, identified by its MAC address.
- Maps a static IP to a dynamic MAC address.
- Ensures critical devices like servers or printers always get the same address.
- Configured on the DHCP server itself.
Memory trick: The DHCP server is like a landlord, assigning addresses. Reservations are like a permanent lease.