The tap itself is typically a dedicated hardware device, which provides a way to access the data flowing across a computer network. In many cases, it is desirable for a third party to monitor the traffic between two points in the network. If the network between points A and B consists of a physical cable, a “network the tapping solution book pdf” may be the best way to accomplish this monitoring.
A port, a B port, and a monitor port. Network taps are commonly used for network intrusion detection systems, VoIP recording, network probes, RMON probes, packet sniffers, and other monitoring and collection devices and software that require access to a network segment. There are various methods for getting access to the network. Many tapping methods can be used, according to the network technology and the monitoring objective.
The first method, when a monitoring device is installed in-line. When a monitoring device is installed in-line, the network will stop every time the device updated or rebooted.
Similarly, if the device failed, the network would break down as well. Another method to monitor networks is by enabling Promiscuous Mode on the host that is used for the monitoring and attaching it to a network switch.
This method works well with old LAN technologies. However, modern network are usually switched based networks, meaning the devices are communicated using Point-To-Point links. If the monitoring device is connected to such a network, it will only see its own traffic, so it is hard for other devices to see the traffic.
Some of the traditional methods for gaining access to the network traffic use a SPAN port, also known as MIRROR port, in the switch. This is a software method for network tapping and places less load on the network switch. This is a low cost alternative to traditional network tap methods. However, not all routers and switches support port mirroring and, on those that do, using port mirroring can affect the performance of the router or the switch.
Often, when the SPAN port is overloaded, packets will be dropped before reaching the monitoring device. There is also the possibility of losing some of the error packets that may be causing problems.
If this data is not sent to the monitoring device because it is dropped, it is impossible to troubleshoot, no matter how advanced a device that may be used. All of these problems can be solved by using a Tapping system.
The Tapping will guarantee that every packet is being sent from the network to the monitoring device. It always passes every packet, even error packets that a SPAN port may drop it, to the monitoring device. V-Line Tapping is the most important Tapping system methods.