IP Routing & Subnetting

Intermediate Networking
ipcalcip routetracerouteCisco IOS

Objective

Hands-on practice with ip routing & subnetting in a network lab environment.

Tools & Technologies

  • ipcalc
  • ip route
  • traceroute
  • Cisco IOS

Key Commands

ipcalc 192.168.10.0/26
ip route add 10.0.0.0/8 via 192.168.1.1
traceroute 8.8.8.8
show ip route

Lab Steps

01
Subnetting Practice

Calculate subnets manually and verify with ipcalc for given requirements.

02
Static Routes

Add static routes on Linux and Cisco IOS to direct traffic.

03
Route Verification

Use traceroute and ping to verify packets take the expected path.

04
CIDR Notation

Work with CIDR notation and understand prefix lengths vs subnet masks.

Challenges Encountered

  • Overlapping subnets cause routing ambiguity
  • Administrative distance determines which route wins

Key Takeaways

  • Draw network diagrams before configuring routes
  • The most specific route (longest prefix) always wins