X.25, ATM and IP are three layers of the protocol, the difference is that IP is not connected, X.25 and ATM are connected to the connection2, frame relay X.25 is evolved from the X.25, FR remove the check is FR3, ATM and frame relay difference is: ATM is asynchronous transmission, FR is synchronous transmission4, Ethernet is our most common, with the work of the MAC address, and the frame relay switch is DLCI, Ethernet at the interface is RJ45, while the frame relay is a serial port Serial
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