Title: Alternating Bit, SDLC
1 ????? ????????? ?? ??????????? Alternating
Bit, SDLC ?? ????????? ????? OpNet ???? ????
037426582 ???? ???? 035834498 ???? ????? ????
2???? ????????
- ????? ?? ????????? ????? OpNet, ???? ??????
- ????,????? ?????? ?????????.
- ????? ?????? ??????????? ??????? ?- OpNet .
- ????? ????????? ???? ??????????? ???????, ???
- ??? ??????? ????????.
3?? ?? OpNet ?
- Optimized Network Engineering Tools
- ??? ???????? ??????, ??? ????? ????? ?????????
???, ??????, ????? ?????? ??????? ??
??????.
- ?????? ???? ?????? ?? ???????? ???????? ???
????, ??? ?? ??????? ?? ?????? ???????.
- ????????? ????? ???? ????????? ????? ????, ?????
?? ???????.
- ???? ???? ?? ??????? ???? ?? ????? ????.
4 (????) OpNet
- ????? ?????? ?-OpNet ?????? ????? ???????
- ??? ??????(process) ???? ?????? ?????.???
?????? ????? ??????? ?????? ?????.
- ??? ????? ??????? ??????? ??????? ???? ??????
??? ?????? ????? ???????? ?"? OpNet ???? ?????
????? .
- ??? ???? ???? ???? ?? ?????? ?????? ?????
?????? ????? ?????.
??? ????
??? ?????
??? ??????
5 Data Link Control ?????????
???? ??????????? - ?????? ????? ????? ??
?????? ??? ??? ?? ??? ??"? ??? ???? ?"?
?????? ?? ?????, ????? ?????? ??????. ????? ????
???? - ????? ?????? ?????? ??????? ?????
(???????? ?????). .FIFO - ????? ??????
??????? ?? ????? ?- - ??? ???? ?????? ?????
???? ????? (?? ?? ????? ???? ????).
6 (????)Data Link Control ?????????
??????????? ??????? ???? ????? - ??? ??????
???????? - ??? ????? ???????.
??? ?????? ???????? - ????? ???? ?????? "?????"
- ?????? ???? ??????. - ????? ???? ?????? ?????
???(?? ???? ???? ???? ???). - ????? ??? ????
????? ?? ????? ????? ????? ???.
??? ????? ??????? - ?????? ?????? ??? ???
????. - ????? ????? ?????.
7 Alternating Bit Protocol
??? ???? ???? ??? ????, ??? ???? ?? b.
????? ?????? ?????
- ????? ????? ???? ??????,????? ?? ?? ??? ????? b
,?????? ?? ??????. - ???? ???? ????????
1. ???? ??? Time-Out , ?????? ????? ??? ??? ??
???? ??? ???? b .
2. ????? ???? ????? Ack , ?? ?? ??? ???? ????
????? ???? ???? ????,?? ????? ???
?????? ????? ????.
3. ????? ???? ????? Ack , ???? ??? ????? ??????
?????? ??? ???? ???? ???? ????,????? ??? ??????
?? ??? ????? ? 1-b ??????? ?????? ?????? ????, ??
??? ????? ????.
8Alternating Bit Protocol
????? ?????? ?????
- ?????? ????? ?????? ?????? ??????
- ????? ???? ??? Time out ????? ????? Ack ?? ???
????? b . - ?? ?????? ?????,?????? ?? ??? ????? ?????? ??????
??? ??? ?????? ?? - - ?? ?? ?????? ?? ?????? ?? ??? ????? b ?- 1-b
??????? ????? Ack ?? ??? ????? ????. - - ???? ?????? ????? Ack ?? ??? ????? b .
9???? ????
10???? ??????
- ??? ???? ?? ????? ?????? ?????? P2P .
11???? ?????? ?? ????? ??????
- ??? ????? ????? ???????
- Init ??? ??????.
- Wait ???? ?? ?????? ???? ??????.
- Send ???? ?? ?????? ????.
- AckWait ??? ?? ???? ????? Ack ?? ?????
TimeOut . - AckChk ???? ?? ?????? ?- Ack ???? ???? ????
???? Wait - ??? ????? ?????? ????????
- ??? ?? ???? ?? ??? ?????? ????????, ????? ?????
?? ?????, ??? ?? ???? ?????? ????? ?????? ?????
??????. ??? ?? ???? ????? ???? ????,???? ?? ??
????? ?????? ????? ??????.
12(No Transcript)
13???? ?????? ?? ????? ??????
- Init ??? ??????.
- Idle ???? ?? ?????? ????,????? ????? Ack
??????. - Disconnected ????? ?? ????? ????? ??????
?????? ???? ?? ??????? ?? ?? ??????
????? ?????? ????.
14 SDLC ????????
- ????? ?????? ?????
- ????? ?????? ???? (??? ????? ????? ????? ?? ??
?????) ????? ???' ??????? ?????? ???? ?? ????
????? ?? ??????? ?????? ?????? ?????. - ????? ??????? ????? ????? ACK ?? ????? ?????? i
???????? ?- ACK ?????? ????? ?? ??????? ??
?????? ?- i ???? ?????? ?? ????? ?????? ?- i .
15???????? SDLC
- ????? ?????? ?????
- ????? ????? ?? ??' ?????? ??????? ???????.
- ???? ????? ??????,???????? ????? ???? ??????? ??
??' ?????? ??????? ???????. - ??????? ????? ????? ????? ACK ?? ?????? ???????
???????.
16???? ?????? ?? ????? ??????
- ??? ????? ????? ???????
- Init ??? ??????.
- Create_Packets ????? ???? ?? ?????? ??????.
- Send ???? ?? ?????? ???? ???? ?????.
- Ack ???? ?? ????? ?- ACK ?????? ?? ?????
?????. - ??? ????? ?????? ????????
- ??? ?? ???? ?? ??? ?????? ????????, ????? ?????
?? ?????, ??? ?? ???? ?????? ????? ?????? ?????
??????. ??? ?? ???? ????? ???? ????,???? ?? ??
????? ?????? ????? ??????.
17(No Transcript)
18???? ?????? ?? ????? ??????
- Init ??? ??????.
- Wait ???? ?? ?????? ????,??? ????? ??? ??????
???? ????? Ack ??????. - Disconnected ????? ?? ????? ????? ??????
?????? ???? ?? ??????? ?? ?? ??????
????? ?????? ????.
19?????? ?????? ???????????
- ?????? ?? ?????? ??? ????? ?-
- ??????? ?????? ?? ???.
- ?????? ???.
- ???? ??????? ????????.
20?????? ??????????
21?????? ?????????? (????)
22????? ???????
????? ??????? ?????? ?? ??? ???? ?? ?????
???????? A.B ????? ????? ?????? ????? ???? ??
?????? ????? ???? ???? ?????????? SDLC ?????
????? ????? ????? ???? ?? ??' ?????? ???? ???? ??
???? ????? ??? ?????? ???? ???? (??????? ?????
?????) ?????? ??????? ???????? SDLC ???? ????
???????? ??????? ??????? ???????? A.B .
23????? ??????? (????)
- ????? ?????? ?? ???
- ?????? ?? ??? ?????? ???? ?? ???????? ?? ????????
A.B. ???? ?????? ?????????? ?? ???? ????? ?????
????? ????? ????? ??? ??????? ????? ?????? ?????
???? ?? ?????? ?? ??? ??? ??? "??" ??? ?????
?????? ??????, ????? ??? ????????? SDLC ??????
??????? ??? ????? ????? ????? ???? ????? ??????
?? ??? ?? ???????? ??? ???? ???? ????????. - ?????????? ????? ????? ??????? ?????? ??????
??????? ????????? SDLC ??? ????? ????? ??? ??????
????????? A.B. - ?????? ????? ???? ????????.
24????? ??????? (????)
- ????? ???? ???????
- ????? ???? ??????? ????? ?? ????? ??? ?????? ????
?????? ???? ?????? ???? ????????? ????? ????
???????????. - ???? ???? ??????? ??? ??????????? ?????? ?????
???? ?????? ???? ??????? ??? ?????? ???????
??????????.
25?????? ??????? !!!
??????? !!!