Network Monitoring

While an intrusion detection system monitors a network for threats from the outside, a network monitoring system monitors the network for problems due to overloaded and/or crashed servers, network connections or other devices.
For example, to determine the status of a webserver, monitoring software may periodically send an HTTP request to fetch a page; for email servers, a test message might be sent through SMTP and retrieved by IMAP or POP3.
Commonly measured metrics are response time and availability (or uptime), although both consistency and reliability metrics are starting to gain popularity. The widespread addition of wan optimization devices is having an adverse 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 established, it times-out, or the document or message cannot be retrieved, usually produce an action from the monitoring system. These actions vary: an alarm may be sent out to the resident (SMS, email,...) sysadmin, automatic failover systems may be activated to remove the troubled server from duty until it can be repaired, etcetera.
Monitoring the performance of a network uplink is also known as network traffic measurement, and more software is listed there.

Website monitoring service can check HTTP pages, HTTPS, SNMP, FTP, SMTP, POP3, IMAP, DNS, SSH, TELNET, SSL, TCP, ping and a range of other ports with great variety of check intervals from every 4 hours to every one minute. Typically, most website monitoring services test your server anywhere between once-per hour to once-per-minute.

Website monitoring services usually have a number of servers around the globe - in America, Europe, Asia, Australia and other locations. By having multiple servers in different geographic locations, a monitoring service can determine if a Web server is available across different Networks worldwide. The more locations used, the better the picture on your website availability.

Wireless Broadband Antenna

Using a router on broadband and/or wireless home networksA network router is a small electronic device that allows you build a home network simply. The home router serves as the core or "centerpiece" of the network to which computers, printers and other devices can be connected. Networking with a router helps you to (for example):-share files between computers-share an Internet connection between computers-share a printer-connect your game console or other home entertainment equipment to the InternetRouters are not necessarily required to build a network. For example, you can connect two computers directly to each other with just a cable (or without wires in some cases). Home routers offer convenience and easier maintenance as your network grows.Both offer advantages to the home and small business customerThis tutorial will help you understand the practical differences between DSL and cable modem networking. While similar in many respects, DSL and cable Internet services differ in several fundamental ways.DSL and Cable - Comparison and ContrastWhen evaluating cable and DSL services, you should consider the following:-Speed (advantage - Cable): Cable boasts faster speed than DSL Internet in theory. However, cable does not always deliver on the promise in everyday practical use.Methods for networking two computersThe simplest kind of home network contains exactly two computers. You can use this kind of network to share files, a printer or another peripheral device, and even an Internet connection.