Chap 11. DLC(data link control)

Chap 11. DLC(data link control)

* framing (size - fix(atm,wan), var(char bit) lan)

* char oriented size - flag(esc), byte stuffing (esc)

* bit oriented size - flag = 01*60, bit stuffing (1*5->0)

* flow control(buffer), simple / stop wait / sliding window

* error control ( skip discard )

* connected / non connected

* simple protocol - flow /error x

* stop and wait protocol  -  ack frame / number(seq), ready blocking (state)

* go back n / selective reject

* ENQ/ACK , Poll/Sellect 

* asynchronous / synchronous (char - BSC, bit - SDLC, HDLC)

* HDLC (high level DLC) - nrm, abm 

* primary / secondary 

* i frame, s frame, u frame (rr, rnr, rej, srej)

* field

* point to point protocol <ppp> (framing temperature addr) , (flow control x)

* link control protocol

* authentication protocol (pap chap)

* network control protocol