DHCP
Definition
Dynamic Host Configuration Protocol - automatically assigns IP addresses to devices on a network, simplifying network management and connectivity.
Use Cases
- Google: Automatically assigning IP addresses to employee and guest devices on large campus networks — Enterprise network teams deploy DHCP services integrated with DNS and IP address management (IPAM) to hand out leases, set default gateways, and provide DNS resolver addresses across many VLANs and Wi-Fi SSIDs. (Reduced manual network configuration, faster device onboarding, and consistent network settings at scale.)
- Amazon: Providing automatic IP configuration for devices in corporate offices and warehouses — IT/network operations run redundant DHCP servers (often paired with directory services and DNS) so laptops, scanners, and IoT devices receive IP addresses and network options automatically when they connect. (Improved operational reliability and minimized downtime caused by misconfigured static IP settings.)
Frequently Asked Questions
- What's the difference between DHCP and DNS?
- DHCP gives devices network configuration like an IP address, default gateway, and DNS server addresses (usually for a limited time called a lease). DNS translates human-friendly names (like example.com) into IP addresses. In short: DHCP helps a device join the network; DNS helps the device find services on the network.
- When should I use DHCP instead of static IP addresses?
- Use DHCP for most client devices (laptops, phones, desktops, and many IoT devices) because it’s simpler and reduces configuration errors. Use static IPs (or DHCP reservations) for infrastructure that must be consistently reachable at the same address, such as routers, firewalls, load balancers, DNS servers, and some application servers—especially when other systems depend on fixed IP allowlists.
- How much does DHCP cost?
- The DHCP protocol itself is free. Costs come from how you run it: (1) on-premises DHCP servers (hardware/VMs, licensing if using commercial OS/software, and operations), (2) managed network equipment that includes DHCP features, or (3) cloud networking where DHCP is typically included as part of the virtual network at no separate line-item, though you still pay for underlying resources (VMs, NAT gateways, load balancers, IP addresses, etc.).
Category: networking
Difficulty: intermediate
Related Terms
See Also