May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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156 Data Communications and Computer Networks
Poll: When the primary node is ready to receive data, it polls or asks all the secondary nodes in a
round-robin fashion to determine if they have any data to transmit. The primary node sends a mes-
sage to a secondary node by specifying the maximum number of frames the secondary node can
send. The secondary node can respond with either negative acknowledgement (NAK) or positive
acknowledgement (ACK). If the response is NAK, the primary node polls the next secondary node.
This process goes on in a cyclic manner until any secondary node responds with an ACK. Once a
positive response is received, ...
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