LAN(Local Area Network)

1
????14

• ????
• (?????????????)

2
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• ??????????????????????????????????????????????
• ?????????
• ?????????????
• ????????????????????????
• ?????????????????????
• ??????????????????

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4
?????????

• LAN(Local Area Network)
• ????????????????????
• WAN(Wide Area Network)
• LAN???????????????
• ? ???????

5
????????

• ????
• ADSL(Asymmetric Digital Subscriber
  Line)1Mbps30Mbps
• ISDN(Integrated Services Digital Network)64kbps
• CATV(Cable Television)12Mbps
• FTTH(Fiber To The Home) 100Mbps

6
ADSL

• ????????????????????
• ????????????????????????????????xDSL?????
• ????(asymmetric)?
• ??????1.5?50Mbps
• ??????0.5?12Mbps
• ??????????67km

7
????

• ??????
• 10BASE-2?10BASE-5
• ??????????
• 10BASE-T?100BASE-TX
• ?????????

8
????

• ???????????????????????????????

NTT
????
ADSL???
LAN??
????
9
?????

• ???????????????????????????????????????????OSI????
  ???????????
• OSI (Open Systems Interconnection)????????????(IS
  O)???????????????????????????????????????
• TCP(Transmission Control Protocol)
  ?4?(????????)??????
• IP(Internet Protocol) ?3?(???????)??????
• HTTP(Hyper Text Transfer Protocol)
  ?5?(??????)????????

10
TCP/IP

• ???????????????????????????????????????PC????????O
  S????????????
• TCP????????IP????????????????(HTTP?FTP?SMTP?POP??
  )?????????????
• IP????????????????????(???????)??????????????????
  ???????????(??????)????????????????

11
PPP

• ????????????????????????????????????????????????

12
PPPoE (PPP over Ethernet)

• PPP????Ethernet????????????????
• PPPoE???????LAN??????????IP??????????????????
• ADSL??????????????????????????????????????????????

13
??????

• LAN??????????????
• CSMA/CD(Carrier Sense Multipul Access with
  Collision Detection)????????????????????????????(
  Carrier Sense)????????????????????????????????????
  ??????????????(Collision Detection)
  ??????????1?????????????????????????(Multiple
  Access)???????

14
???????????

• WWW(World Wide Web)
• ???????
• ?????
• ?????
• ????
• ???????
• FTP(File Transfer Protocol)
• Telnet

15
??????????????

• TCP/IP (Transmission Control Protocol/Internet
  Protocol)
• HTTP (Hyper Text Transfer Protocol)
• SMTP (Simple Mail Transfer Protocol)
• POP (Post Office Protocol)
• FTP (File Transfer Protocol)
• DHCP (Dynamic Host Configuration Protocol)
• TELNET

16
HTTP

• Web??????????(Web??????)??????????????????????
• HTML?????????????????????????????????????????????
  ?????????

17
SMTP/POP
SMTP ??????????????????????????????????? POP
??????????????????????????????????
18
FTP

• ??????????????????TCP/IP??????????????????????????
  ???

19
IP????

• ??????????????????????????????????????????????????
  ???????? 32???(4,228,250,625??)?????????8?????????
  10??????????
• ?
• 133.38.51.1
• 10000101 00100110 00110011 00000001

20
????? (2?????)
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.
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16,777,214?
.
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.
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65,534?
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.
???C
254?
???????

• ?????????????IP??????????????????????
• ?????????B133.38.. saitama-u.ac.jp

21
??????(????????)

• IP???????????????????????32???????????????1??????0
  ??????
• 8?????????10??????????
• ???C??
• 255.255.255.0
• ???????? ?????????????????????

22
DNS

• Domain Name System
• IP????????????????????????????????????????????????
  ??????IP??????????????????????????
• ?
• 133.38.51.1?pauli.apc.saitama-u.ac.jp

23
??????????
DNS
DNS
DNS
A
B
C
24
DHCP

• ????????????????????????IP????????????????????????
  ???
• DHCP??????????????????????????????????????????????
  ??
• ??????????????????????????????????????????

25
????????

• ????????
• ????????????????????????????????
• ???
• ??????
• ??????

26
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• ??????????????????????????????????
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• ????????????????????????

27
???????

• ????????????
• ??????????
• ?????????

28
??????

• ??????????????????
• ???web?????????
• ???????????????
• OS??????????????????

29
???????????

• ????
• ????
• ????
• ???

30
?

• ???????????????????????
• 2007/8/23
• ??????????????????????????????????????????????????
  ??????????????????????????????????????????????????
  ??????????????????????????????????????????????????
  ??????????????????
• ??????????????????????????????????????????????????
  ??????????????????????????????????????????????????
  ???????????????????

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31
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• ??1?22?(?)78??
• ?? ????1??206
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• ????
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32
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• 2??????????
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• 16???????????????

33
??????????

• ??????
• ?????????????????IC
• CPU???4004

34
?????????

• ???????5???
• CPU????????????
• ????
• ???ROM?RAM???????????
• ??????????????
• HDD?????????????????????
• ????????????????

35
?????????2

• ???????
• OS(Operating System)
• OS??????
• ????????

36
???????????

• ??????
• ????????????
• ???
• ???(???)

37
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38
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Basic?????????
39
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40
??????????????

• ???????????
• ??????????????
• ???????
• ?????????????
• ????????
• ??????????
• NP??
• NP????

41
????

• ??????
• ?????
• ??????
• ???????????
• ??????????????
• IP????
• ??????????
• DNS
• ????????

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42
??????

• ????X61029
• ????
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