Title: ???(point-to-point)??
1? 4 ? ?????(???)
- 4.1 ??????????
- 4.2 ?????
- 4.3 ?????
- 4.4 ??????????
- 4.5 ??????
- 4.6 ?????
- 4.7 ?????
- 4.8??????????
- 4.9 ?????????
-
24.1 ??????????
- ???????????????????
- ????????????????????????
- ?????????????????????,?????????????????????,??????
??????????????????????
3????? ???(point-to-point)?? ????(?????)??????
??????? ????????,????? ??(broadcasting)?? ????????
??,??????????? ??????,??????????? ?????????????
......
4??????????
?? H1 ? H2 ????
??? R1
??? R3
?? H1
??? R2
?? H2
???
???
???
???
???????????
5??????????( ?)
?? H1 ? H2 ????
??? R1
??? R3
?? H1
??? R2
?? H2
???
???
???
???
?????????????
H1
H2
???
???
R1
R2
R3
???
???
???
???
???
???
???
???
???
???
???
???
???
???
???
???
???
64.1.1 ??????
- ??(link)???????????????,??????????????(????)
- ??????????????????
- ????(data link) ???????,??????????????????????????
????????????,?????????
7- ??????????????(???)??????????????
- ??????????????????????????
8??????????
?? A
?? B
???
IP ???
IP ???
??
??
?? ???
?
?
???
1010 0110
1010 0110
??
(a)
?? A
?? B
??
??
?? ???
??
(b)
9???????????
- ???????????????????????,???????????????????
- ????????????????(procedure)?????????,??????????
10??????????
- (1) ????
- (2) ???
- (3) ????
- (4) ????
- (5) ???????????
- (6) ????
- (7) ??
114.1.2 ??????
- (1) ????
- (2) ????
- (3) ????
121. ????
- ????(framing)???????????????????,?????????????????
- ????????????????????
IP ???
???
???
?? ??
???
??????
???
? MTU
????????
13???????????????
????
????
SOH
?????????
EOT
?
????
??SOH?EOT??????????,????????
142. ????
- ?????????????????????,????????????
- ??????????????????????????,??????????,????????????
??????????????????????????????
152. ????
???EOT
????
????
?? ??
SOH
EOT
EOT
????????????
???? ???????
16????????
- ???????????????????SOH?EOT???????????ESC(???
????? 1B)? - ????(byte stuffing)?????(character
stuffing)?????????????????????????????? - ?????????????,???????????????????????????????????,
???????????
17???????????????
????
????
????
SOH
EOT
SOH
ESC
EOT
SOH
????
????
????
????
SOH
ESC
EOT
ESC
SOH
ESC
ESC
ESC
SOH
EOT
????????????
?? ??
183. ????
- ???????????????1 ????? 0 ? 0 ????? 1?
- ??????,??????????????????????? BER (Bit Error
Rate)? - ??????????????
- ????????????,???????????,?????????????
19?????????
- ???????????,??????????? CRC ??????
- ????,????????????? k ????
- ?????????? M 101001(?? k 6)???? M
????????????? n ?????????
20??????
- ?????? 2 ???? 2n ? M ???,????? M ???? n ? 0?
- ??? (k n) ?????????????? (n 1) ???? P,???? Q
???? R,?? R ??? P ?1 ?,? R ? n ??
21????????
- ?? k 6, M 101001?
- ? n 3, ?? P 1101,
- ???? 2nM 101001000?
- ? 2 ??????? Q 110101,
- ?? R 001?
- ??? R ?????????? M ??????????????2nM R
- ?101001001,? (k n) ??
22???????????
110101 ? Q
(?) P (??) ? 1101 101001000 ? 2nM (???)
1101
1110
1101
0111
0000
1110
1101
0110
0000
1100
1101
001 ? R (??),?? FCS
23????? FCS
- ??????????????????? FCS (Frame Check Sequence)?
- ?????? CRC ?????? FCS?????
- CRC ??????????,? FCS ?????????????
- FCS ??? CRC ??????,? CRC ?????? FCS ??????
24???????????? CRC ??
- (1) ?????? R 0,??????????,???(accept)?
- (2) ??? R ? 0,?????????,????
- ??????????????????????????????
- ?????????,??????????? P,????????????????????
25????
- ???????? CRC ???????????????(accept)?
- ?????????????(????????),?????????? 1
????????????????????? - ?????????????????????????(????????????)?
- ???????(??????????)??????????????
26????
- ????????????????,???????????????????????????,?????
????????????????????
27?????????
????
A
B
? ? ?
ACK
? ? ?
ACK
? ?
(a) ????
28??????(auto repeat request)
- ???????????????????????????,?????????????????????
?????????????
29?????? ARQ ????
- ?????? ?
- ????????????,????,???????????????
- ????????,??????????,??? ARQ ????? ARQ?
30?? ARQ ???????
- ??????????,??????????,????????????????
- ????????????????,?????????????
- ?????????,?????????????
31?? ARQ ???????
A
B
ACK1 ?? DATA0
????
? ? ? ? ? ?
ACK2 ?? DATA1
??
DATA2 ??,??
tout
DATA3 ???,??,?? ACK2
DATA4 ???,??,?? ACK2
DATA5 ???,??,?? ACK2
ACK3 ?? DATA2
ACK4 ?? DATA3
????
32????????????
- ?????????????,??????????????????,?????????????????
???(?????) - ?????????????,?????????,?????????????????
- ????????
33 4.1.3 PPP ?????
- ???????????????????????? PPP (Point-to-Point
Protocol)? - ???????????????,?????? PPP ???
34??? ISP ????? PPP ??
????????? ????? IP ??
? ?
????
???
ISP
PPP ??
351. PPP ????????
- ?????????
- ????
- ???
- ???????
- ??????
- ????
- ??????
- ??????
- ???????
- ??????
362. PPP ????????
373. PPP ?????
- 1992 ???? PPP ????? 1993 ?? 1994 ????,??? PPP
?????????????RFC 1661? - PPP ?????????
- ??? IP ??????????????
- ?????? LCP (Link Control Protocol)?
- ?????? NCP (Network Control Protocol)?
38PPPoE????? PPP (point to point protocol over
Ethernet)
- ? ??????PPP??(???????),???????????????,???????????
????,??????????????? - ????,?????????PPPoE????????????????????,??????????
?ADSL ????PPPoE???
39PPPOE???
- ??????-??-gt????????
- ???Internet-????????
- ?????????????
- ??ISP??
- ????
40(No Transcript)
41? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9 ?????????
424.2 ?????
- 4.2.1?????????
- ??????????
- ????????????
- ?????,????,????
434.2.2???????
- ???????????????????????????????????
- ?????????????,???????????????
- ??????????????
444.2.3?????????
451 ???????
???
???
?????
???
???
????
462?????????
- ???(????????)
- ????(????)
- ??
-
47??????
3?????????????
- ??????
- ????
- ????
- ????
- ????
- ????????(????)
- ????
- ???? ,???????(polling),????
48? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
?????????? 4.8 ????? 4.9 ????
494.3 ?????(Ethernet)
- ?????????????(PARC)1975????
- PARC??????????????,??????????????????????????????
???????Smalltalk???????Interpress(PostScript???)?
???????????????????????????
504.3 ?????(Ethernet)
- ????????
- ???????????10Mbps?????
- ??CSMA/CD(???????????????)???
- ?????????,??????????
- ???????,??????????,?????,?????????????
514.3 ?????
4.3.1????????
- 1. ????
- DIX Ethernet V2 ????????????(???)????
- IEEE ? 802.3 ???
- DIX Ethernet V2 ??? IEEE ? 802.3 ?????????,?????
802.3 ?????????? - ????,????????? DIX Ethernet V2 ???????
52- 2?IEEE802??
- IEEE???Institute of Electrical and Electronics
Engineers???,???????????????????????????,?????????
???????IEEE802????????????,???????????(ANSI)??????
??????
53IEEE 802???????????????(???????????),?????????????
????,????????????????????????????? ??IEEE
802???????????????????????????????????
54IEEE802.12------100VG-AnyLAN???????????? IEEE
802.14 ????????(HFC)??????????????????? IEEE
802.15?????????,??????zigbee? IEEE 802.16????
MAN ?? - WiMAX IEEE 802.17?????(RPR)??? IEEE
802.18????????????(Radio Regulatory) IEEE
802.19?????????????? IEEE 802.20????????(MBWA)??
?
553. ???? IEEE802?OSI???????,????????????,??????
??????????????? ??????MAC????????LAN?????????????
? ??????LLC??????MAC?????????,?????LLC??,?????????
?????
56- ?????? LLC (Logical Link Control)??
- ?????? MAC (Medium Access Control)???
- ???????????????? MAC??,? LLC ??????????,????????
????? LLC ????????? ?
57LLC ????? ??????
???
???
?? ???
? ? ?
???
???
?? 1
?? 2
58(No Transcript)
59??????? LLC ??
- ?? TCP/IP ??????????? DIX Ethernet V2 ??? 802.3
?????????,???? 802 ?????????????? LLC(? 802.2
??)????????? - ??????????????? MAC ????? LLC ???
604.?????
- ?????????????(adapter)?????? NIC (Network
Interface Card),???? - ???????
- ????/?????
- ????????
- ??????????????????
- ????????
61???????????????
???
? ? ? ?
????? (??)
CPU
???
????
????
I/O ??
????
62????????????????
????
IP ??
???
??? (??)
CPU ? ???
????
?? ??
????
??????? ???????
???????? ???????
634.3.2????????/????CSMA/CD
- ????????????????????????????????????????,?????????
???
????(????????????)
????
?? D ?? B ?????
D
A
E
B
C
B? D ????
???
???
???
??
64??????????
- ?????????????????? B ????????
- ??????? D ????????????????,???? D ?????????
- ????????(A, C ? E)???????????????,????????????????
?? - ????????????????????
65????????????????????
- (1)???????????????,??????????????????
- ???????????????,???????????
- ?????????????????,?????????????????
66????????
- ???????????????,??????????
- ???????????????????,????????????????????
- ??????????????????,????????????????,??????????????
?
67(2)???????????????(Manchester)??
??
1
1
1
1
1
0
0
0
0
0
??????
??????
?????? ????
68????????/???? CSMA/CD
- CSMA/CD ?? Carrier Sense Multiple Access with
Collision Detection? - ????????????????????????????
- ???????????????????????????????????????,???,????
?????,??????? - ????????????????????????????????
69????
- ????????????????????????????
- ???????????????,???????????????(????)?
- ????????????????????????,???????????????????,?????
??? - ??????????????????????????
70??????
- ??????,????????????????,??????????????
- ???????????,????????????,????????,??????????,?????
???????????
71????????/???? CSMA/CD
- ????,????
- ????,????
- ????,?????
72????
- ?? CSMA/CD ??????????????????????????(?????)?
- ?????????????????,????????????
- ??????????????????????????????????
73??????
- ??????? 9.6 ?s,??? 96 bit ??????
- ??????????????,???? 9.6 ?s ?????????
- ??????????????????????????,???????????
74????????
- ???????? ????????????????????,?????????????????
???????,???????? - ???? ??? CSMA/CD ??????
- ????? ???????????
754.3.3??????????
- ????????????????
- ??(?????)
- ??(???)
- ??
- ??,??????????????
76???????????????
???
???
???
??
DB-15 ???
???
?????
RJ-45 ??
BNC ??? ??
???
??? ???
MAU
???
MDI
???
BNC T ???
????
??????
77??????????
?? 1
?? 3
???
???
750 m
250 m
???
???
?? 2
78? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9 ?????????
794.4??????????
4.4.1 ??????????
- ???????????????,?????????????????,????????????????
??? - ???????????,?????????????????????,?????(hub)
80??? 10BASE-T
- ??????????????
- ??????????????????????,?????(hub)?
- ???????????????,????????????????????
81????????????
??
???
RJ-45 ??
?????
82?????????????
- 10BASE-T ???????,????????????? 100 m?
- ?? 10 Mb/s ???????????????,??????,????????
-
- 10BASE-T ?????????,???????????????????,???????????
?????????????
83????????
- ?????????????????????,??????????????????????
-
- ????????????????????,????????? CSMA/CD
??,?????????? - ??????????????,???????
84??????????
? ? ?
???
??
??
??
???
???
???
85??????
?????
86??????
????
874.4.2 ???? MAC ?
4.4??????????
1? MAC ??????
- ?????,???????????,? MAC ???
- 802 ??????????????????????????
- ?????????????? 48 bit ???????
8848 ?? MAC ??
- IEEE ??????? RA ?????????????????(??? 24 ?)?
- ???????????(??? 24 ?)???????,???????,?????????????
????? - ?????????224????????? 48 ????? MAC-48,???????EUI-4
8? - MAC???????????????????EUI-48?
89? 6 ??
? 1 ??
??????? EUI-48 ?? AC-DE-48-00-00-80
?????? EUI-48 ??
?????
??????? OUI
????
? 1
? 2
? 3
? 4
? 5
? 6
802.5 802.6
802.5 802.6
????
10101100 11011110 01001000 00000000 00000000
10000000
???
???
??? ????
??? ????
I/G ??
????
? 1
? 2
? 3
? 4
? 5
? 6
802.3 802.4
????
00110101 01111011 00010010 00000000 00000000
00000001
???
???
??? ????
??? ????
I/G ??
90????????
???????????????, ????????????????
1A-24-F6-54-1B-0E
00-00-A2-A4-2C-02
???
20-60-8C-C7-75-2A
08-00-20-47-1F-E4
20-60-8C-11-D2-F6
91???? MAC ??
- ??????????? MAC ????????? MAC ??? MAC ??.
- ????????????,???????????
- ????????,??????????
- ?????????????
- ??(unicast)?(???)
- ??(broadcast)?(????)
- ??(multicast)?(???)
92 ???????????????MAC??,?????????????????(PR
OM)??
Ipconfig /all
MAC?????
93(No Transcript)
942. MAC ????
- ??????MAC????????
- DIX Ethernet V2 ??
- IEEE ? 802.3 ??
- ???? MAC ????? V2 ????
95???? MAC ???
IP?
??
46 1500
6
6
2
4
MAC ?
????
???
??
? ?
FCS
MAC?
??
??? MAC ?
???
8 ??
7 ??
1 ??
10101010101010 10101010101010101011
??? ???
????
962 ?MAC ???
?????? 6 ??
IP ?
MAC ?
???
MAC ?
97????? 6 ??
IP ?
MAC ?
???
MAC ?
98???????????????????, ?????? MAC ????????????????
???? 2 ??
IP ?
MAC ?
???
MAC ?
99?????????? MAC ?????? ???? 64 ?? ? 18 ????????
?????????
???? 46 1500 ??
IP ?
MAC ?
???
MAC ?
100?????????? 1?10?8 ?, MAC ????????????? 1?10?14?
FCS ?? 4 ??
IP ?
MAC ?
???
MAC ?
?????????? 46 ???, ????????????????????, ???????
MAC ????? 64 ???
101???????? 8 ?????????? 7 ???, ?????,?????? MAC
??????? ????????????,?????????MAC ??
IP ?
MAC ?
???
MAC ?
????????, ??????????? ?? MAC ??? 8 ???
102??? MAC ?
- ?????????????????
- ???????????
- ????????? FCS ?????
- ????????? 46 1500 ?????
- ??? MAC ???? 64 1518 ?????
- ???????? MAC ?????????????????????
103? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9?????????
1044.5 ??????
??????????????????????
4.5.1 ?????????
??? ???
??
?? ?????
?? ?????
105???????????????
????????
???
???
???
??
??
??
106????????????????????
????????
?????
???
??
??
??
107?????????
- ??
- ???????????????????????????????
- ??????????????
- ??
- ??????,???????????
- ????????????????,?????????????????
1084.5.2???????????
- ?????????????????
- ??????????,??? MAC ????????????????
- ????????????????????,?????????????,?????????? MAC
??,????????????????
109 1????????
??
???
??
??
1
?
1
?
?
1
2
?
???? ??
???? ??
2
?
?
2
?? 1
?? 2
??
??
?? B
?? A
?
?
?
?
?
?
110???????????????
B2
B1
???
???
???
A
B
C
D
E
F
111?????????
- ??????
- ????????
- ???????
- ??????????? MAC ???????(?10 Mb/s ? 100 Mb/s
???)?????
112?????????
- ??????????
- ?MAC ????????????
- ???? MAC ????????????????
- ????????????(??????)???????????,??????????????????
?????????????????
113?????????????????
A
B
???
???
?
?
?? 1
?? 2
IP
IP
?
?
R
R
MAC
MAC
MAC
DL
DL
?
?
?
?
???
???
???
???
???
???
LAN1
LAN2
?
????
? ?
? ?
IP-H
? ? ? ?
MAC-H
MAC-T
?
PPP-H
PPP-T
??????????????
114??????(????)??
- ????????,???????????
- ???????????? CSMA/CD ???
- ???????????,?????????????
- ??????????????????????????
1152?????
- ???????????????(transparent bridge)?
- ????????????????????????????,???????????????
- ?????????????,???? IEEE 802.1D?
1163. ?????
- ????????,????????????
- ???(source route)???????????????????????
- ??????????????????????,???????????????
- ???????????????????????????????,??????????????????
??????????????????,??????????????????
1174????????????
- 1990 ??????????(switching hub),?????????????
- ???????????????(switch)???????(??????????????)?
- ??????????????????,???????????????????,???????????
???
118?????????
- ???????????????????,??????????????
- ??????????????,??????????????????????,???????????
- ????????????????????,?????????
119?????????
- ???? 10 Mb/s ???????,??? N ???,?????????????????(1
0 Mb/s)? N ???? - ?????????,??????????????? 10 Mb/s,????????????????
?????????????????,?????? N ???????????? N?10
Mb/s?????????????
120????????????
??? ???
???
100 Mb/s
????
100 Mb/s
??? ???
100 Mb/s
???? ???
??
??
??
???
???
???
10BASE-T
121(No Transcript)
122? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9?????????
1234.6 ?????
4.6.1????????
- ????? VLAN ????????????????????????
- ??????????????
- ??? VLAN ????????????,????????????????? VLAN?
- ??????????????????????,????????????
124??? ???
C3
B3
A4
VLAN3
VLAN1
VLAN2
??? ???
C2
B2
A3
C1
??? ???
B1
A2
A1
??? ???
??????? VLAN1, VLAN2 ? VLAN3 ???
125??? ???
C3
B3
A4
VLAN3
VLAN1
VLAN2
??? ???
C2
B2
A3
C1
??? ???
B1
A2
A1
??? ???
? B1 ? VLAN2 ???????????, ??? B2 ? B3 ??????????
??????? VLAN1, VLAN2 ? VLAN3 ???
126??? ???
C3
B3
A4
VLAN3
VLAN1
VLAN2
??? ???
C2
B2
A3
C1
??? ???
B1
A2
A1
??? ???
B1 ?????,??? A1, A2 ? C1 ????? B1 ????????
??????? VLAN1, VLAN2 ? VLAN3 ???
127??? ???
C3
B3
A4
VLAN3
VLAN1
VLAN2
??? ???
C2
B2
A3
C1
??? ???
B1
A2
A1
??? ???
???????????????????,???? ????????????(?????)????
????
??????? VLAN1, VLAN2 ? VLAN3 ???
1284.6.2?????????
- ?????????????????????? 4 ??????,?? VLAN
??(tag),???????????????????????
129?????
- ????????????????????,??????????????????????????,??
???????????????,????????,????? - ???????????????????????????,???????????????,??????
??? - ?????????,?????????????????,??????????????????????
???VLAN?
130????????????
???
???????
???
?????
HUB
10Mbps UTP
1000Mbps Fiber
100Mbps UTP (?????)
100Mbps UTP
131? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9 ?????????
1324.7 ?????
- ??????? 100 Mb/s ????????????
- ??????? 100 Mb/s ????????????,??? IEEE 802.3
?CSMA/CD ???100BASE-T ???????????(Fast Ethernet)?
4.7.1 100BASE-T ???
133100BASE-T ??????
- ???????????
- MAC ?????? 802.3 ??????
- ????????,???????????????? 100 m?
- ?????????? 9.6 ?s ????? 0.96 ?s?
- ????
134??????????
- 100BASE-TX
- ?? 2 ? UTP 5 ???????? STP?
- 100BASE-FX
- ?? 2 ????
- 100BASE-T4
- ?? 4 ? UTP 3 ??? 5 ???
1354.7.2 ??????
- ??? 1 Gb/s ???????????????
- ?? 802.3 ?????????
- ????????? CSMA/CD ??(?????????? CSMA/CD ??)?
- ? 10BASE-T ? 100BASE-T ???????
136??????????
- 1000BASE-X ??????????
- 1000BASE-SX SX?????
- 1000BASE-LX LX?????
- 1000BASE-CX CX????
- 1000BASE-T
- ?? 4? 5 ?? UTP
137?????
- ????????????????(?????????????????),?????????????
138???????????
?????
??? ?? ???
100 Mb/s ??
1 Gb/s ??
???????????
1394.7.3 10 ???????100 ??????
- 10 ??????? 10 Mb/s,100 Mb/s ? 1 Gb/s ????????????
- 10 ?????????? 802.3 ???????????????,?????
- 10 ???????????????,????????,???? CSMA/CD ???
14010 G?????????
- 10GBASE-SR ??,300 m,????(0.85 ?m)
- 10GBASE-LR ??,10 km,????(1.3 ?m)
- 10GBASE-ER ??,40 km,????(1.5 ?m)
- 10GBASE-CX4 ??,15 m,4 ???????(twinax)
- 10GBASE-T ??,100 m,4 ? 6A ?UTP ???
14140GB/100GB ?????????
? ? ? 40GB ??? 100GB
??? ?????? ????1 m 40GBASE-KR4 ?????? ????
7 m 40GBASE-CR4 100GBASE-CR10 ???????
??100 m 40GBASE-SR4
100GBASE-SR10 ??????? ??10 km
40GBASE-LR4 100GBASE-LR4 ??????? ??40 km
100GBASE-ER4
142?????????
- 10 ?????????,??????????????(???????)??????????,???
???????????? - ??????????
- ?????
- ??????
- ????????????????
- ???????????????
143???? 10 Mb/s ?100 Gb/s ???
- ???? 10 Mb/s ? 100 Gb/s ??????????
- ????(? 10 Mb/s ? 100 Gb/s)?
- ???(????????/??????/??)?
- ?????
- ?????
1444.7.4 ?????????????
- ????????????? 1 10 Gb/s ,????????????????????,??
???????????????????? - ??????????????????????,???????????????????????
- ???????????????????,??????????????????????????????
???????
145???????????? FTTB
????? GigaPoP
10 M
1 Gb/s
10 M
??????
??????
100 M
1 Gb/s
100 M
?????????FTTx??PPPoE???
146? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9 ?????????
1474.8 ??????????
- 4.8.1 100VG-AnyLAN ???
- ?????? 100 Mb/s ?????
- 4.8.2 ????????? FDDI
- (Fiber Distributed Data Interface)
- ????????????????
- 4.8.3 ??????? HIPPI
- (HIgh-Performance Parallel Interface)
- ????????????????(?????????????)?????
- 4.8.4 ????(Fibre Channel)
148? 4 ? ?????(???)
4.1 ?????????? 4.2 ????? 4.3 ????? 4.4
?????????? 4.5 ?????? 4.6 ????? 4.7
????? 4.8?????????? 4.9 ?????????
149???????
4.9 ?????????
- ???????
- ????????
- ???????????????????
- ???????????,????????
- ??????????
- ??????
- ???? (???,??????)
1504.9.1 ?????WLAN
??Wireless Local Area Network????
????????????????? ????????????
???????????,?????????
???????? ???????????????????????????
1514.9.1 ????????
1??????????????(IEEE802.11)
AP1
AP2
152??????? BSS ?????????????, ?????? BSS
?????????, ???? BSS ??????? , ????? BSS ????
AP1
AP2
153?????????????? AP (Access Point) ?????????
???????? AP ?,???? AP ?? ????? 32 ????????? SSID
??????
AP1
AP2
154?????????????,??????? AP ??????????? DS
(Distribution System), ??????????????,?? ??????ESS
(Extended Service Set)?
AP1
AP2
155ESS ????????(portal)??????? ?? 802.11
?????(??,????? ????)??????????????????
AP1
AP2
156??? A ???????????? ????????(? A?
???), ??????????? B ?????
AP1
AP2
157???? AP ????(association)
- ????????????????? BSS,??????????? AP,???????????
- ?????????????????? AP ?????,???? AP ????????????
- ????? AP ????????????,?????????????? AP
?????????????
158??(hot spot)
??802.11???????? Wireless-Fiedlity (?????)
- ??????,??????????????????????????????????? Wi-Fi
??????????????? - ?????? AP ???????????(hot zone)??????????????
- ???????????????? WISP (Wireless Internet Service
Provider)?????????????????? WISP,????????????????
159 PCI?????? ?????????????????????????????????????
,????,???????????????????????????????????????????
160 PCMCIA?????? ????????????,?????????????PC?????
???????,????????????PCMCIA?????
161??AP(AP,Access Point,????????????????)??????????,?
????????????(??AP),?????????(??????????)??????????
AP??????????????????,???????????????????,?????????
????,???????802.11???
162?????AP
- ??????????,???????????????????AP????????????????
????,??AP?????,?????????????????,????????????????,
???????????????????,????AP?????????500??
???????AP?????????,??DNS?DHCP?Firewall????????????
??????????????
163???AP
- ????????????,?????????,??????AP????????????DHCP???
??????? ????????AP???????AP,?????AP??,??????????
????????????????????,??????????????????!!
???????AP?????????????,????????????
164????????
- WEPWired Equivalent Privacy,?????????????????????
?????????,?????????????????? - WPAWi-Fi Protected Access,???????????(Wi-Fi)?????
,???????????????????(WEP)???????????????? - WPA2??? Wi-Fi ?????? IEEE 802.11i ????????
1652? ????????????(ad hoc network)
- ?????????????(??? AP)?????????????????????????????
?????????
????
????
????
C
B
D
????
????
E
A
F
???
166???????????
- ??????,????????????????????????????
- ????????????????????????,???????????????
- ????????,????????????????????????????
167??????? WSN (Wireless Sensor Network)
- ????????????????????????
- ??????????????????????????,???????????,???????????
????,????????? - ???????????????,????????????????
- ??????????????????????????????????????
168????????(a)???(b)
?? ???
CPU
??
???
??? ??
(a)
(b)
169??????????????
- ???????(?????????????)
- ???????????????????????
- ????????????????
- ????????(????????)??????
- ?????????????/??/??????
170????????? IP ????
- ?? IP ??????????????????????
- ?? IP ??????????????????????????????????
- ????????????????????????,??????????????,??????????
??
171???????
- ????(fixed access)?????????,??????????????
- ????(mobility access)???????????????????????????
,????????? - ????(portable access)???????????,???????????????
??????,?????????? - ????(nomadic access)????????????????????????????
??????,???????????????????
1724.9.2 802.11 ???????
- 802.11 ????????????????
- ???????????? 802.11b,?????(802.11a ?
802.11g)????????? - 802.11 ?????????????
- ?????? DSSS
- ?????? OFDM
- ???? FHSS (????)
- ??? IR (????)
173????? 802.11 ?????
?? ?? ???? ???
???
802.11b 2.4 GHz ??11 Mb/s ??
???????,????,
????????,??????
802.11a 5 GHz ??54 Mb/s OFDM
???????,??????????,
????,????????,?????
802.11g 2.4 GHz ??54 Mb/s OFDM
???????,??????????,
????????,??????,
???802.11b?
802.11n 2.4 GHz ??600 Mb/s MIMO
??????????????????? 5 GHz
OFDM ???,???????(40 MHz)????
?600 Mb/s
1744.9.3 802.11 ???? MAC ???
- ???????????? CSMA/CD ?
- ????????????
- CSMA/CD ??????????????????,???????????,???????????
????????????? - ???????????????,????????????????????,?????????????
?
175??????????
??????????????????? ???????(hidden station
problem)
A ?????
C ?????
A
B
C
D
? A ? C ?????????,??? B ????, ???? B ????,???????
176??????????
?? B ? A ???????? C ? D ???? ????????(exposed
station problem)
C ?????
B ?????
?
A
D
C
B
B ? A ????,? C ??? D ??? C ?????????,?????? D
?????
177CSMA/CA ??
- ????????? CSMA/CD,???????? CSMA ???
- ??????? CSMA ????????(Collision Avoidance)???
- 802.11 ??? CSMA/CA ??????? CSMA/CA
???,???????????? - ????? 802.11 ? MAC ??
178802.11 ? MAC ?
MAC ???????????????? BSS ? ????????????????????
?????(??)
???? (????)
????? PCF (Point Coordination Function)
MAC ?
?????? DCF (Distributed Coordination
Function) (CSMA/CA)
???
179DCF ?????????? CSMA ??????????,???????????????????
DCF ?????????
?????
????
????? PCF (Point Coordination Function)
MAC ?
?????? DCF (Distributed Coordination
Function) (CSMA/CA)
???
180PCF ????????????????????????????????????
?????
????
????? PCF (Point Coordination Function)
MAC ?
?????? DCF (Distributed Coordination
Function) (CSMA/CA)
???
181CSMA/CA ?????
- ?????????????? 802.11 ??????????????????????????
- ????????????????????????????????????????????
- ?????????? MAC ??,????????,???????? DIFS ??????
1824.9.4 802.11 ???? MAC ?
- 802.11 ???????,?????????????
- ????????????
MAC ??
MAC ??
?? 2 2 6
6 6 2 6
0 2312 4
???
???
?? 1
?? 2
?? 3
????
?? 4
???
FCS
? 2 2 4
1 1 1 1
1 1 1 1
?? ??
??
???
?? AP
?? AP
?? ??
??
?? ??
?? ??
WEP
??
183802.11 ????????
- MAC ??,? 30 ???????????????
- ???,?????????,???2312 ??????????????????????
802.11 ?????????? 1500 ??? - ????? FCS ???,? 4 ??
1841. ?? 802.11 ??????
- 802.11 ????????????????????? 4 ???????????????????
??
? DS ? DS ?? 1 ?? 2 ?? 3 ?? 4
0 1 ???? AP ?? ???
1 1 AP ?? ??? ????
185(No Transcript)
186??????????????????
- ??????? 16 ?,???????? 12 ?,?????? 4 ??
- ?????? 16 ??
- ???????? 11 ?????
- ????????? 0?
- ???????????????????
- ???????? 1 ???????????????????
- ???????? WEP ? 1 ??? WEP 1,?????? WEP ?????
1874.9.5 ??????? WPAN (Wireless Personal Area
Network)
- ????????????????????????????????,???????? AP?
- ?????????? 10 m ???
- ??????? WPAN ?????? PAN (Personal Area
Network)??????,?? PAN ?????????????
188WPAN ? WLAN ?????
- WPAN ??????????????????,??????????????????????????
?????WPAN ???? 2.4 GHz ? ISM ??? - ? WLAN ?????????????????,?????????????????????
1891. ????(Bluetooth)
- ????? WPAN ? 1994 ?????????????,???? IEEE
802.15.1 ? - ??????? 720 kb/s,????? 10 ????
- ???? TDM ??????? FHSS ????????????(piconet)?
190???(piconet)
- Piconet ???????,?????????????????
- ????????????(Master)???7???????(Slave)?
- ???????????,????????????,????????????(scatternet)?
- ???????????????????????????
191?????????????
???
M
S
S
P
??? 2
S
M
??? 1
S
P
S
S
S
M
???
S
???
P
?????
1922. ?? WPAN
- ?? WPAN ??????????????????????,???? 2 250 kb/s?
- ?? WPAN ???? IEEE 802.15.4?????????? IEEE
802.15.4-2006? - ?? WPAN ??????? ZigBee?
- ZigBee ????????????(???????????)???????,??????????
?(10 80 m),???????,???????
193ZigBee ???
- ??????????,???????????????,ZigBee
????????,????????????????????? 1
???,???????????10 ?? - ???????? ZigBee ????????255 ???,????????,?????????
????????,???????????? 64000 ????
194ZigBee ???
- ? IEEE 802.15.4 ???????????
- ?? ZigBee ???? 802.15.4 ???
- IEEE 802.15.4 ????? ZigBee ?????????(???? MAC
?),??????(???????)??? ZigBee ??????
195ZigBee ????
???
ZigBee ????
???
ZigBee ???
MAC ?
IEEE 802.15.4 ??
???
196ZigBee ???????????????,??????
???????? FFD ????????? ZigBee ??????????????????
RFD ???
???
RFD
FFD
???
FFD
FFD
???
FFD
FFD
FFD
FFD
1973. ?? WPAN
- ?? WPAN ?????????????????,??11 55 Mb/s????,???
802.15.3, ? - IEEE 802.15.3a ?????????????????????? WPAN,??????
UWB ??? - UWB ????? 3.1 10.6 GHz ????,????????????????????
???????? 25 ??,?????????? 500 MHz? - ??????????????,??? 100 400 Mb/s
????,?????????????? DVD ???????????
1984.9.6 ????? WMAN(Wireless Metropolitan Area
Network)
- 2002 ? 4 ???? 802.16 ???????????? ETSI
????????????? HiperMAN? - WMAN ???????????????(???????????)?
- ??????,???????????????????,???????????????
199802.16 ?????????????
2004.9.7???????
- ???????
- ???????????????????????????,????????????,?????30?
?,????????200?? - ?????????????????????? ?
- ?????????????????????,???????????????????????
2014.9.7???????
- ???????
- ??????????????????????????????????????,???????
???,????????????????,????????????????,????????
2024.9.7???????
- ???(1G)????????????????? FDM ???
- ???(2G)??????????????(????),???????????? GSM ???
- 2.5G ???? 2G ????(3G)????????,? GPRS ? EDGE ??
2034.9.7???????
- 3G ?????????????????,??? IP ?????????????(????????
?),?????????????(?????????,???????,????,???????),?
CDMA2000,WCDMA ? TD-SCDMA?
204GSM ?????????????
????
?? ????
?? ???
?????
BSC
MSC
?? MSC
??
GPRS ??????
SGSN
GGSN
???
??
???
??
?? GPRS ????
205?? IP
- ???????????????,???????? IP ???
- ?? IP ??????,???????????????????????
206?? IP ????????
???? 131.8.0.0/16
???? 15.0.0.0/8
???? 131.8.6.7/16
A
??? A
???? 131.8.6.7/16
?
?
???
????
???? 15.5.6.7/8
????
?
?
??? B
2074.9.8?????????
?? ???
1 Gb/s 100 Mb/s 10 Mb/s 1 Mb/s 100 kb/s 10
kb/s
Wi-Fi
802.15.3 ???
4G ????
802.11n
WiMAX
802.11g, a
802.16
802.11b
802.15.1 ??
3G ????
802.15.4 ZigBee
2G ????
????
PAN LAN
MAN WAN
2081G?2G??????????????
- 1G(first generation)???????????,?????????????????,
?????????????,???????
- 2G,???????????????,?????????????
209- 3G???3rdGeneration???,????????????????????????????
????????????????????????????????????,?????????????
???????????????IP?????????????(?????????)?
- 4G???????????????,??3G?WLAN???????????????????????
?????????????????
210LTE(Long Term Evolution,????)
- LTE???????FDD-LTE?TDD-LTE,?????LTE???????LTE?? ?
- 4G??
- LTE
- LTE-Advanced
- WiMax
- Wireless MAN