Does the Ethernet physical layer protocol represent open?or closed?loop operation?
What will be an ideal response?
Electrically, the Ethernet physical layer protocol is open?ended. A transmitter injects data into the Ethernet. There
is neither a data available nor a data acknowledge signal. The Ethernet physical layer protocol is called CSMA/CD
(carrier sense multiple access/collision detect). A potential transmitter first listens to the Ethernet to see if anyone
else is transmitting. If the Ethernet is free, it goes ahead and sends a message. While transmitting, it also monitors
the bus (Ethernet) and stops transmitting if some other node has started sending a message. That might happen if
two devices are waiting to use the bus, hear that it is free, and go ahead and transmit at the same time.
The loop is closed in the sense that an acknowledgement is transmitted by the receiver. The physical layer level
transmission is open?ended, but the data link layer mechanism is closed?loop.
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