Static & Dynamic Routing, EtherChannel & Security Hardening

Designed and implemented a multi-site enterprise network in Cisco Packet Tracer, focused on Layer 2/3 redundancy and secure remote management.

Key highlights:

Subnetted 192.168.1.0/24 using VLSM across 6 LANs and 6 point-to-point serial links

Interconnected 5 core routers with redundant serial links for automatic failover

Configured OSPF (Area 0) on all routers for dynamic route learning, verified with equal-cost multi-path routing

Implemented Layer 2 redundancy using EtherChannel (LACP) to bundle 3 physical links into a single logical trunk, eliminating loops while preserving bandwidth

Hardened device security with encrypted passwords (service password-encryption), console/VTY protection, and SSH + Telnet remote access

Verified full connectivity through OSPF route tables, EtherChannel status, and live SSH/Telnet sessions

Tools: Cisco Packet Tracer