What Does DHCP Mean in 200-301? — Definition & Guide

Full Definition

DHCP automates IP address assignment. Clients send a DISCOVER broadcast, servers respond with OFFER, clients send REQUEST, and servers confirm with ACK — remembered as DORA. DHCP assigns IP address, subnet mask, default gateway, DNS server, and lease duration. Cisco routers can act as DHCP servers, relay agents (ip helper-address), or clients. The relay agent (ip helper-address) forwards DHCP broadcasts to a server on a different subnet.

CLI Command

ip dhcp pool SALES
 network 192.168.1.0 255.255.255.0
 default-router 192.168.1.1
 dns-server 8.8.8.8
ip dhcp excluded-address 192.168.1.1 192.168.1.10

Exam Trap — Don't Get Fooled

DHCP uses UDP ports 67 (server) and 68 (client). DHCP DISCOVER is a broadcast — it does not cross router boundaries without an ip helper-address configured on the router interface facing the clients.

Related 200-301 Terms

UDP

A Layer 4 connectionless protocol that prioritises speed over reliability.

DNS

A hierarchical system that translates human-readable hostnames into IP addresses.

DHCP Snooping

A switch security feature that filters DHCP messages to prevent rogue DHCP servers.

Frequently Asked Questions

What does DHCP mean on the 200-301 exam?

DHCP automates IP address assignment. Clients send a DISCOVER broadcast, servers respond with OFFER, clients send REQUEST, and servers confirm with ACK — remembered as DORA. DHCP assigns IP address, subnet mask, default gateway, DNS server, and lease duration. Cisco routers can act as DHCP servers, relay agents (ip helper-address), or clients. The relay agent (ip helper-address) forwards DHCP broadcasts to a server on a different subnet.

How does DHCP appear as a trap on the 200-301?

DHCP uses UDP ports 67 (server) and 68 (client). DHCP DISCOVER is a broadcast — it does not cross router boundaries without an ip helper-address configured on the router interface facing the clients.

How important is DHCP on the 200-301 exam?

DHCP falls under the IP Services domain of the 200-301 exam. Understanding it in context with related terms like dns and dhcp-snooping is essential for answering scenario-based questions correctly.