,
.
.
,
. ,
.
. , ,
, .
. ,
, .
– .
, ,
. ,
. ,
( . 6.17). LLC (Logical Link Control)
, . .
MAC (Media Access Control) .
. 6.3.
,
. ,
. .
. 6.17.
– ,
.
– .
, , .
.
.
.
, ,
.
, ,
. ,
,
,
.
, : .
.
. ,
, .
,
,
.
BSC (Binary Synchronous Communication), IBM.
: .
, – (
, ). BSC :
, , .
. , ,
. .
. ,
)
).
,
.
.
, .
– . , –
.
,
. ,
. , , ,
.
,
.
HDLC (High-level Data Link Control – ) .
HDLC ,
. . , HDLC
– .
, , , , ,
.
.
.400 ( ) FTAM (File Transfer, Access and Management – ,
).
.
.21 .21- .
HDLC , .25/3.
. ,
– (IEEE – Institute of Electrical and Electronics Engineers).
IEEE 802 , (ISO)
. :
802.1 – ;
802.2 – (LLC);
802.3 – (CSMA/CD – Carrier Sense Multiple Access with Collision Detection –
);
802.4 – ;
802.5 – ;
802.6 – .
. 6.18.
, .
. . ,
.
, ,
.
.
(
Norton Commander).
:
;
;
;
.
:
;
;
.
. – LANServer (IBM), Windows NT Server 3.51 4.0 NetWare (Novell).
.
, :
, , .
, ( . 6.19).
. – .
, , .
.
. 6.19.
–
– 0,25 - 1 .
( ),
.
. 6.20)
,
10-50 . :
.
, . .
, , .
. 6.20.
- ( . 6.21).
.