Lab 9: Centralized DHCP for Two Departments via Relay
Build a central DHCP service on an IOS-XE router and service two branch departments across a routed hop via DHCP relay. Configure two DHCP pools (SALES and SUPPORT) with proper options and excluded ranges on the HQ server, and enable ip helper-address on both branch LAN interfaces so clients obtain leases from the correct pool. Verify leases and bindings using Linux and IOS show commands, and confirm return-path reachability with prebuilt static routes.
DHCP Troubleshooting Capstone: Branch Relay
Advanced CCNA troubleshooting capstone for centralized DHCP across a relay. A centralized IOS-XE router (DHCP-SRV) serves the branch LAN behind BR-RTR via ip helper-address. The lab imports in a deliberately broken state: the DHCP pool scope and gateway are misconfigured on the server, and the relay configuration is missing on BR-RTR. Learners must diagnose using show outputs and Linux tools, fix all three discrepancies, and verify that two Alpine clients dynamically receive usable leases and can reach DHCP-SRV.
Lab 4: DHCP Relay with ip helper-address
Configure a centralized DHCP server on an IOS-XE router and relay DHCP from a remote branch LAN using ip helper-address on a branch router. Verify leases, helper configuration, and end-host reachability across a routed path.
