Jeremy’s IT Lab - CCNA Lecture Notes

Introduction

• Jeremy’s IT Lab: Free course for CCNA preparation.
• Encouragement: Subscribe, like, comment, and share the videos.
• Tools: Download labs from the video description. Use Packet Tracer or Boson’s NetSim for practice.
• NetSim vs. Packet Tracer: NetSim supports up to CCNP level, whereas Packet Tracer is limited to CCNA level.

Lab Overview

• Setup: Preconfigured devices from Day 17’s lab, with SW2 replaced with a Layer 3 switch.
• Connections: Hosts in correct VLANs; SW1 and SW2 connected via a trunk; R1 and SW2 connected using the router on a stick.
• Objective: Change router on a stick to inter-VLAN routing via SVIs on SW2.

Lab Steps

Step 1: Replace Router on a Stick Configuration

1. R1 Configuration: Disable Subinterfaces and Assign IP

   • Enter privileged mode with ENABLE and display configurations using SHOW RUN.
   • Remove subinterfaces: NO INTERFACE G0/0.10, .20, .30.
   • Assign IP to G0/0: IP ADDRESS 10.0.0.194 255.255.255.252.

2. SW2 Configuration: Configure G1/0/2 Interface

   • Enter privileged mode with ENABLE and check config: SHOW RUN.
   • Return interface to default: DEFAULT INTERFACE G1/0/2 (repeat if needed).
   • Set as Layer 3 interface: NO SWITCHPORT and assign IP.
   • Enable IP routing: IP ROUTING.
   • Set default route: IP ROUTE 0.0.0.0 0.0.0.0 10.0.0.194.

Step 2: Configure SVIs on SW2

• Check VLANs: DO SHOW VLAN BRIEF to ensure existence of VLANs 10, 20, 30.
• Configure SVIs:
  • INTERFACE VLAN 10 and assign IP 10.0.0.62 255.255.255.192.
  • INTERFACE VLAN 20 and assign IP 10.0.0.126 255.255.255.192.
  • INTERFACE VLAN 30 and assign IP 10.0.0.190 255.255.255.192.
• Test Connectivity:
  • Ping tests to ensure SVIs are UP/UP and traffic routes correctly through SW2, not R1.

Troubleshooting with NetSim

• Lab Preview: InterVLAN Routing 2, troubleshooting network problems.

Task 1: Verify and Correct Workstation Configurations

• Issue: PC3 unable to ping other devices.
• Verification: Confirm IP configuration; identified incorrect subnet mask.
• Correction: Correct IP configuration using IPCONFIG /IP 192.168.100.3 255.255.255.128.

Task 2: Verify and Correct Switch Configurations

• Potential Issues in Inter-VLAN Routing:
  • Incorrect VLAN assignment.
  • Trunk misconfigurations.
• PC1 and PC3 Configurations:
  • PC3 in VLAN12 instead of VLAN10; corrected VLAN assignment.
• Trunk Configuration Checks:
  • Use SHOW INTERFACES TRUNK to verify trunk settings.
• Final Testing: Conduct ping tests to confirm connectivity.

Conclusion

• NetSim as a Tool: Recommended for additional practice and preparation for the CCNA exam.
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