Alternatively, if the device is employing a
full-duplex mode (i.e., it can transmit and receive simultaneously??”the most common
scenario in today??™s networks), there is no such protocol employed and transmission is
fairly straightforward (just successive frames are sent after an Inter Frame Gap (IFG)
to ensure no collisions).
The receiving device (the printer, in this case) will observe the incoming frame, identify
the destination address on the frame as being the same as its own MAC address, and
make sure the frame has not been corrupted. If everything is fine, the receiving device
accepts the frame and sends it to the upper layer. This process is the same independent
of whether the device??™s MAC is half-duplex or full-duplex.
If a frame has to be broadcast to all devices on the network, then an address of all
1s is inserted in the DA. The transmission is the same, however, and every receiving
device will receive a frame as if it is the destination device.
An Ethernet LAN typically operates in its own domain or segment. Every DTE in a
segment shares the same physical medium and receives all transmitted frames (but,
as mentioned, will accept only those destined for it).
Pages:
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103