CCNA Foundations Day 1: L3 & IP Addressing

Archive lab

Beginner CCNA lab focusing on IPv4 addressing and basic Layer 3 verification on a small branch network. You will assign IP addresses to router interfaces, confirm end-host default gateways, and verify connected reachability using host-based pings. You will also learn to read 'show ip interface brief' and 'show ip route' to confirm operational state before any routing beyond directly-connected networks is configured.

Learning objectives

• Apply IPv4 addressing to router interfaces in a multi-subnet small-branch topology
• Confirm and reason about end-host default gateways in a routed LAN
• Verify link and host reachability using ping from the end hosts
• Interpret 'show ip interface brief' and 'show ip route' to validate interface state and connected routes
• Troubleshoot common IP addressing and cabling errors that prevent basic connectivity

Troubleshooting focus

• Fix mismatched IP and mask on router interfaces and hosts
• Resolve down/down or err-disabled switch ports and shut router interfaces
• Correct wrong or missing default gateway on hosts
• Use 'show ip route' and 'show interfaces status' to localize L1/L2 vs L3 faults