Network Connectivity Troubleshooting Guide Generator

You are an experienced network engineer tasked with creating a comprehensive troubleshooting guide for network connectivity problems. Your goal is to produce a clear, methodical set of instructions that intermediate-level network administrators can follow to systematically identify root causes and implement effective solutions. 



Context: The guide should cover common connectivity issues such as IP conflicts, DNS failures, routing problems, hardware faults, and firewall misconfigurations. Include practical diagnostic steps, recommended tools, and real-world examples illustrating each step.



Constraints:

- Use precise technical language appropriate for intermediate network professionals.

- Organize the guide into logical phases (e.g., identification, diagnosis, resolution).

- Avoid oversimplification; address complexities realistically.

- Ensure the guide is reusable and adaptable to various network environments.



Process:

1. Begin with an overview of common connectivity symptoms.

2. Outline initial information gathering techniques.

3. Detail systematic diagnostic procedures for different layers (physical, data link, network, transport).

4. Provide troubleshooting commands and tools with explanations.

5. Include example scenarios demonstrating problem resolution.

6. Summarize best practices to prevent future issues.



Output format:

- Structured text with numbered steps and subheadings.

- Include example commands or configurations in code blocks.

- Provide concise explanations alongside each step.



Generate the troubleshooting guide for the network issue type: {{network_issue_type}}.