The combined measurements and PROCESSES used to discover, diagnose, and address problems in a computer network are referred to as network troubleshooting. It's a logical procedure used by network engineers to address network issues and increase network performance.

Before you begin troubleshooting any problem, you should have a clear grasp of what the issue is, how it arose, who it affects, and how long it has been present. You'll have a far higher chance of addressing the problem quickly if you acquire the proper facts and clarify the problem, rather than wasting time on useless fixes. To assist diagnose and fixing the issue, you can always start troubleshooting with these simple network troubleshooting procedures.

• Hardware Inspection: To begin, inspect the hardware that is installed on a computer, server, laptop, or other similar devices to ensure that it is connected, switched on, and operational. Sometimes the issue is as simple as a loose cord, a router that has shut down, or an unplugged cord; in these circumstances, network troubleshooting is unnecessary. Other basic methods for debugging network hardware can be followed.
  Perhaps turning the gadget on and off or leaving it off for sixty seconds will cure the problem. CYCLING at a high intensity is also a good way to do so.
• Ipconfig: Ipconfig can be used to display TCP/IP network configuration values, discard a device's current IP and DHCP settings, and refresh a device's DHCP settings. Type ipconfig into the TERMINAL from the command prompt. You may get your default gateway and IP address, but if it starts with 169, it won't get a genuine IP address. In some circumstances, using "ipconfig/renew" to request a new one would solve the problem. If you acquire your IP address through an ethernet cable, the problem is with the router rather than the network.
• Ping and Tracert: The "ping" command lets you send a signal to another device, which, if it is operational, will respond with a response to the sender. The "ping" command employs a "echo request," which is a component of the ICMP (Internet Control Message Protocol). When you ping a device, you're sending out an echo request, and you'll get an echo back if the device is active or online. Tracert command displays all of a packet's steps on its way to its destination.
  If the IP address is correct without ethernet, the issue is most likely between your router and the internet. This is the moment to use ping to check if larger servers can connect to your router. If this is unable to connect to your router, there may be an issue. Tracert, which bounces between your router and server’s DNS, can also be used to track the problem. We can pinpoint the EXACT site of the issue, and if the error occurs early, the issue may be with your local network.
• DNS Check: Use nslookup command to see if the server you're using has any issues. The nslookup command retrieves DNS records for a domain name or an IP address. Remember that DNS servers contain IP addresses and domain names, therefore the nslookup command allows you to query DNS records for information. If you see terms like "timed out," "service failure," "refused," or "network is unreachable" on your screen, the issue is with the DNS rather than your network. To find the precise IP address(es) associated with a domain name, use the nslookup command. There is a DNS problem if this utility is unable to resolve this information. Along with simple LOOKUP, the nslookup tool can query specific DNS servers to discover if there is a problem with the host's default DNS servers.
• ISP (Internet Service Provider) contact: Contact your internet service provider if you have any problems with your internet service. Perhaps there is a problem on their end. You can also use the mobile apps to see if other people are experiencing the same issues by looking up outage maps and associated information.
• Malware and Viruses Check: Malware and Viruses Check is done to see if something is preventing some programs from connecting to the network and running properly. This could be because your antivirus software isn't up to date, or the network is experiencing issues that are being blocked by it.
• Database logs: Checks for faults in your database and database connections if it isn't performing properly. Perhaps it is not working as it should, causing difficulties to spread and the network to slow down.