Computer Networking · Intermediate level

Intermediate level · Module 5: Cisco Packet Tracer Labs · Lesson 3 of 3

Testing and Troubleshooting in Simulation

Prove that a design works and find faults systematically.

In this lesson you will

  • Write and run a test plan
  • Troubleshoot simulated faults

Key concepts

test planexpected resultstraceroutefault isolation

The lesson

A test plan lists each test, the expected result and the actual result: connectivity within and between VLANs, guest isolation, DHCP, DNS and internet access.

When a test fails, work layer by layer: link lights, VLAN assignment, IP settings, routing, then services.

Record each fault, its cause and the fix.

Step by step

  1. Write the test plan.
  2. Run each test.
  3. Troubleshoot planted faults.
  4. Record results.

Practice activity

Test and troubleshoot the simulated office.

Expected result: A completed test plan and fault log.

Check your understanding

  1. What does a test plan record?

    Show answer

    Each test, expected result and actual result.

  2. How should a failed test be investigated?

    Show answer

    Layer by layer from physical connections upwards.

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