Network monitoring is the process of continuously monitoring a computer network for slow or failing components and that notifies the network administrator (via email, SMS or other alarms) in case of outages. Network monitoring is part of network management.

There are many different network monitoring tools available. Some of the most popular network monitoring tools are:

• Nagios: Nagios is an open-source network monitoring tool. It is one of the most popular network monitoring tools in the world.
• Zabbix: Zabbix is an open-source network monitoring tool. It is another popular network monitoring tool.
• SolarWinds: SolarWinds is a commercial network monitoring tool. It is a very powerful tool that can be used to monitor a wide variety of devices.
• PRTG: PRTG is a commercial network monitoring tool. It is a very easy-to-use tool that can be used to monitor a wide variety of devices.

There are many different network monitoring protocols, but some of the most common protocols are:

• Simple Network Management Protocol (SNMP): SNMP is a protocol that is used to manage devices on a network. SNMP is a simple protocol that is easy to use.
• Internet Control Message Protocol (ICMP): ICMP is a protocol that is used to send error messages and operational information. For example, the ping command uses ICMP to test the connectivity between two devices.
• NetFlow: NetFlow is a protocol that is used to collect IP traffic information. NetFlow can be used to monitor the traffic on a network and to identify potential problems.

There are a number of different network monitoring best practices, but some of the most important best practices are:

• Monitor the right things: You should monitor the things that are important to your business. This includes the availability of your network, the performance of your network, and the security of your network.
• Set thresholds: You should set thresholds for the things that you are monitoring. This will allow you to be notified when there is a problem.
• Use a variety of tools: You should use a variety of tools to monitor your network. This will give you a more complete picture of the health of your network.
• Automate your monitoring: You should automate your monitoring as much as possible. This will free up your time so that you can focus on other things.
• Review your monitoring data regularly: You should review your monitoring data regularly. This will help you to identify trends and to prevent problems from occurring.