This document describes a lab experiment on computer networks using Cisco Packet Tracer. The objectives were to set up a LAN with computers, switches, printers and a router. IP configurations and default gateways were assigned to 15 devices on 3 different networks - PCs and printers on 10.10.10.0/24, 20.20.20.0/24, and 30.30.30.0/24 networks.