Network monitoring describes the use of a system that monitors a computer network for slow or failing components and that notifies the network administrator (via email and other alarms) in case of outages. Network management involved in functions of network monitoring.
Intrusion detection system monitors threats coming from outside the network, where as network monitoring system monitors the network problems caused by overloaded and/or crashed servers, network connections or other devices.
For example, to analyze the status of a web server, monitoring software may periodically send an HTTP request to fetch a page.
Email servers a test message probably be sent through SMTP and retrieved by IMAP or POP3.
Commonly measured is response time, availability and uptime, although both consistency and reliability measure are starting to gain popularity.
The widespread addition of WAN optimization devices is having balancing effect on most network monitoring tools -- especially when it comes to measuring accurate end-to-end response time because they limit round trip visibility.
Status request failures such as when a connection cannot be done properly it times-out, or the document or message cannot be retrieved and then take an action from the monitoring system. These actions can vary an alarm may be sent via SMS, email etc to the resident system admin, auto failover systems may be activated to remove the troubled server from duty until it can be repaired.
Monitoring the performance of a network uplink commonly known as network traffic measurement
Website monitoring service can check HTTP pages, HTTPS, SNMP, FTP, SMTP, POP3, IMAP, DNS, SSH, TELNET, SSL, TCP, ICMP, SIP, UDP, Media Streaming and a range of other ports with a variety of check intervals ranging from every four hours to every one minute. Typically, most network monitoring services test your server anywhere between once/hour to once/minute.
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