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2. Promiscuous mode - Wikipedia

   en.wikipedia.org/wiki/Promiscuous_mode

   Promiscuous mode is often used to diagnose network connectivity issues. There are programs that make use of this feature to show the user all the data being transferred over the network. Some protocols like FTP and Telnet transfer data and passwords in clear text, without encryption, and network scanners can see this data.

3. POST card - Wikipedia

   en.wikipedia.org/wiki/POST_card

   POST cards for PCs, while originally high-priced, cost from just a few US dollars upwards in the 21st century. Some motherboards have a built-in display to diagnose hardware problems. Most also report POST errors with audible beeps, if a PC speaker is attached. Such motherboards make POST cards less necessary.

4. netstat - Wikipedia

   en.wikipedia.org/wiki/Netstat

   Shows network statistics. netstat -r: Shows kernel routing information. This is the same output as route -e. netstat -i: Displays a table of all network interfaces. Add -e to get output similar to ifconfig. netstat -ct: Displays TCP connections continuously. netstat -g: Display multicast group membership information for IPv4 and IPv6. netstat -lntu

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6. Diagnostic program - Wikipedia

   en.wikipedia.org/wiki/Diagnostic_program

   A diagnostic program (also known as a test mode) is an automatic computer program sequence that determines the operational status within the software, hardware, or any combination thereof in a component, a system, or a network of systems. Diagnostic programs ideally provide the user with guidance regarding any issues or problems found during ...

7. Packet analyzer - Wikipedia

   en.wikipedia.org/wiki/Packet_analyzer

   Recording just headers reduces storage requirements, and avoids some privacy legal issues, yet often provides sufficient information to diagnose problems. Captured information is decoded from raw digital form into a human-readable format that lets engineers review exchanged information.

8. ping (networking utility) - Wikipedia

   en.wikipedia.org/wiki/Ping_(networking_utility)

   ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It is available in a wide range of operating systems – including most embedded network administration software.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.