Cisco Certified Support Technician (CCST) NetworkingIP ServicesMedium
A network administrator is designing a new network segment where devices must consistently receive the same IP address every time they connect, despite using DHCP for initial configuration. This is crucial for internal services that rely on stable IP addresses for access control. Which DHCP feature should the administrator implement to achieve this persistent IP address assignment for specific devices?
- ADHCP Lease Duration Extension
- BDHCP Relay Agent
- CDHCP Address Pool Exclusion
- DDHCP Reservation
Show answer & explanationAnswer & explanation
Correct answer: D. DHCP Reservation
DHCP Reservation allows an administrator to assign a specific IP address to a device based on its MAC address. This ensures that the device always receives the same IP address from the DHCP server.
Why the other options are wrong
- A. Lease duration extension increases how long an IP is held, but doesn't guarantee the *same* IP upon reconnection after expiration.
- B. A DHCP Relay Agent forwards DHCP requests between subnets, it doesn't assign specific IPs.
- C. Address pool exclusion prevents certain IPs from being assigned, it doesn't reserve for specific devices.
DHCP Reservation
A DHCP feature that permanently assigns a specific IP address to a particular network device based on its MAC address.
- Ensures consistent IP assignment.
- Useful for servers, printers, network infrastructure.
- Requires knowledge of the device's MAC address.
Memory trick: A 'Reservation' guarantees your favorite table (IP address).