DECISION BENCHMARK

Network Diagnostic Workbench

Educational troubleshooting decision tool. Input observed symptoms to systematically isolate TCP/IP fault domains without guessing.

Browser Execution & Privacy Architecture

This browser-based tool does not run commands, scan hosts, or test your network. It analyzes the observations you provide. All logic executes locally in your client sandbox to formulate fault domain hypotheses and recommended next steps.

Step 1: Enter Observed Diagnostic Symptoms

1. Can you ping your local Default Gateway?

Yes (0% loss, low latency) No (Request timed out / unreachable) Not Tested Yet

2. Can you ping a known Public IP address (e.g. 8.8.8.8 or 1.1.1.1)?

Yes (Internet IP reachable) No (Public pings fail / timeout) Not Tested Yet

3. Does DNS successfully resolve domain names (e.g. nslookup or ping by hostname)?

Yes (Hostname resolves to IP) No (Server failure / Non-existent domain) Not Tested Yet

4. Can the destination TCP port be reached (e.g. Test-NetConnection or curl)?

Yes (Port is open / handshake completes) No (Connection refused / timed out) Not Tested / Unknown

Scope of Issue

Single Device Multiple Devices Entire Site / Subnet

Connection Medium

Wired Ethernet Wi-Fi Wireless Remote Access VPN

Layer Isolation Analysis

DNS Resolution / Forwarder Failure

Likely Fault Domain

Supplied Evidence:

Diagnostic Reasoning:

Recommended Next Steps

Suggested Terminal Commands

Expected Observations to Confirm or Refute Hypothesis:

Confirming Observation

Refuting Observation