, - . - SDLC - Synchronous Data Link Control - , IBM SNA. ISO HDLC - High level Data Link Control. HDLC X.25 LAP - Link Access Procedure. LAPB.
. . .
.3.24 . , . - .
Control , .
Data . , , .
Checksum - CRC .
01111110 . : Information, Supervisory, Unnumbered. control .3.25. Seq 7 . Next . , . - .
P/F . , P. , , P. , , F.
Supervisory . 0 - (RECEIVE READY). , .
1 - (REJECT) - . Next , .
2 - RECEIVE NOT READY. , Next. , - . RECEIVE REDAY, REJECT .
3 - SELECTIVE REJECT - , Next. LAPB SDLC .
- Unnubered. , .
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DISConnect - . SNRM SABM - , , . FRMR - (, , ).
SLIP - Serial Line IP.
SLIP - . 1984 Rick Adams SUN . RFC 1055. : - IP .
TCP IP , . RFC 1144.
- , . , IP . , Internet - .
, IP . IP , IP .
, - . .
, , .