May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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136 Data Communications and Computer Networks
extended frame format in which the control field is of 16-bits is used then N(S) field becomes larger.
The next single bit after N(S) is the P/F bit where P stands for poll and F stands for fina . If P/F bit is
set to one, it means poll, that is, frame has been sent by a primary station to a secondary station. On
the other hand, if P/F bit is zero, it means final, that is, frame has been sent by a secondary station to
the primary station. The last three bits in control field comprise the N(R) subfield that defines an ACK
number corresponding to received frame, which has been piggybacked on the ...
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