8`网桥（8` Bridge）.docVIP

8`网桥（8` Bridge） 8` bridge.Txt bridge The bridge (Bridge) as an intelligent repeater. The repeater receives signals from a network cable into the amplification, a cable. In comparison, the bridge down from the level of information upload more sensitive. The bridge connects the two similar network, and manage the network data flow. It works at the data link layer, not only can the distance or range expansion of the network, but also can improve performance, reliability and security of network. Networks 1 and 2 through the bridge connection, the bridge receives 1 network packets sent, check the data packet in the address, if the address belongs to the network 1, it will give up, instead, if it is 2 network address, it will continue to be sent to the network 2. using bridge isolation divides the network information. Into many segments, isolated security network, to prevent other network users illegal access. Because the network segments, each segment is relatively independent, fault does not affect a segment to another segment of the operation. The bridge can be specialized hardware equipment, bridge software can also be realized by the computer to install, then the computer will install multiple network adapters (NIC). A bridge function The bridge function in extending the network span similar to the repeater, but it can provide intelligent connection service, according to the address of the frame in which the end point for forwarding and filtering network. Bridge on the site is on the understanding of self-learning. When using a bridge connecting two sections of LAN, from 1 MAC to the bridge network frame, first check to the end point. If the frame is sent to the 1 segment on a station, the bridge is not forwarded to the 2 frame segment, and to filter out; if the frame is sent to the 2 segment on a station, the bridge will forward it to the segment 2, this shows that if LAN1 and LAN2 have a pair of users communicate simultaneously in this segment, apparently can be ac