DHCP Reservation Using MAC Address
Which of the following procedures uses MAC to assign an IP address to a computer?
Community Insight
The question tests the mechanism of dynamic IP assignment tied to hardware identity, with the trap being confusion between static configuration and server-side reservations.
A DHCP reservation uses a device's MAC address to assign a consistent IP address from the scope. This page explains how reservations differ from static assignments and exclusions.
Option A (Static IP) is often chosen incorrectly because it also results in a fixed IP, but it does not use the DHCP process or MAC binding on the server side.
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Expert Analysis
Why the Answer Is Correct
A DHCP reservation maps a specific MAC address to a specific IP address within the DHCP server's scope. When a client with that MAC address requests an IP, the server always assigns the reserved address. This combines the benefits of dynamic management with the stability of a static address.Why the Other Options Are Wrong
Assigning a static IP address (A) is configured on the client itself, not by the DHCP server using the MAC. Creating an exclusion (B) prevents an IP from being assigned at all, rather than assigning one. VLAN-assigned leases (D) relate to network segmentation logic, not specifically MAC-based IP mapping.Community Comment Notes
The community consensus strongly supports Option C, noting that 'Reservation uses the device's MAC address to keep giving it the same IP.' This aligns with standard networking practices for managing fixed addresses via DHCP.Exam Strategy
Differentiate between where the configuration happens: Client-side static IPs vs. Server-side DHCP reservations. Both result in a fixed IP, but only reservations use the MAC-to-IP binding mechanism provided by the DHCP service.
Frequently Asked Questions
Is a DHCP reservation the same as a static IP?
No. A static IP is configured manually on the device, while a reservation is configured on the DHCP server to always give that specific IP to the device's MAC.
What does a DHCP exclusion do?
An exclusion removes an IP address from the pool of available addresses so it cannot be assigned to any device, preventing conflicts.
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