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Linux+ Guide to Linux Certification
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... rates tend to be variable, and sometimes bursty. • Data is broken into small packets • The header of each packet will carry necessary control information such as destination address, port number, etc • Two approaches are available to switch and route the packets: datagram and virtual circuits ...
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... a frame and either forwards this frame onto the next LAN or does not. • The bridge examines the source address in a frame and places this address in a routing table, to be used for future routing decisions. ...
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Network tap

A network tap is a 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 tap"" may be the best way to accomplish this monitoring. The network tap has (at least) three ports: an A port, a B port, and a monitor port. A tap inserted between A and B passes all traffic through unimpeded, but also copies that same data to its monitor port, enabling a third party to listen.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. Taps are used in security applications because they are non-obtrusive, are not detectable on the network (having no physical or logical address), can deal with full-duplex and non-shared networks, and will usually pass through traffic even if the tap stops working or loses power.
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