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12.4. MAC Bridging

A home router sometimes can have more than one means to connect to PCs. A home router can have a built-in Ethernet hub and a built-in wireless Ethernet access point as shown in Figure 12.16. PCs connected to either Ethernet or wireless Ethernet can share not only the ADSL broadband access service but also files (over a peer-to-peer network), if the MAC bridge function (as defined by the IEEE 802.1D standards [7]) is included in the home router. All LANs (defined under the IEEE 802 standards document group) have similar but different frame formats. A MAC bridge reframes a received packet from one port of a LAN and forwards it to a destination node through another port connected to a different LAN. Sometimes the recalculation of FCS is also necessary because different LANs might use different FCS methods.

Figure 12.16. A Home Router with Ethernet Hub and Wireless Ethernet Access Point



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