What programs or utilities do you use for diagnosing and configuring network connections?

The following utilities are often used for diagnosing and configuring network connections:

• ping — checks the availability of a host on the network.
• traceroute (or tracert in Windows) — determines the route to a host.
• ipconfig (Windows) / ifconfig or ip (Linux) — views and configures network interfaces.
• netstat — displays active network connections and ports.
• nslookup or dig — checks DNS records.
• telnet or nc (netcat) — checks port availability.

These tools help identify network issues, verify configurations, and test connections.