OSI%20????

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??????

• ?????

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????

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

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????????? OSI ???????

• ? OSI ?????, ??????????????, ?? 9-48
  ????????????? OSI ????????

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????

• ???? (Ethernet) ?1960????1970????? (Xerox)
  ??????????????????????????????????,
  ????????10Mbps (???? 1Gbps) , ????????????????????
  ????, ??? 9-49 ???

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?????

• ????? (token ring) ?1980???, ?IBM????????????????
  ??????? 4Mbps (????100Mbps), ???????????????????
• ????????????????? ?????? , ??????????????

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?????????
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????

• ??????????????????, ?????????????????????????????
  ?????, ??????????????? (Carrier Sense Multiple
  Access/Collision Detect, CSMA/CD)
  ????????????????????, ?????, ?????????????

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TCP/IP

• TCP/IP (Transmission Control Protocol/Internet
  Protocol, ??????/??????) ???????????? ARPANET
  ????????????
• TCP ?????????????
• IP ?????????? IP ?????????????

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TCP/IP
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TCP/IP ? OSI ??
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?? TCP/IP ??????
?????

• ? Windows ?????, ?????????????/ MS-DOS ???
  (?????/????/??????/??????? ??, ???????)
  ???????????????????????????

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

• ping???????????????????????????, ????????????
  "ping www.edu.tw", ??????? WWW ????????????
• ipconfig???????IP????????????
• tracert????????????????????????????

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

• telnet???????????, ???? "telnet
  bbs.mgt.ncu.edu.tw", ???????????? BBS ????
• ftp?????????????????, ???? "ftp
  ftp.nctu.edu.tw", ?????????????? FTP ????
• ???? Windows 98 ?????, ? ipconfig ??? "winipcfg"
  ???

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??????

• IP
• DNS (Domain Name Server)
• DHCP(Dynamic Host Configuration Protocol )
• NAT(Network Address Transform )
• ?????Proxy

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IP ??

• IP ?????????? Internet ??????, ???????????????????
  IP ?? (IP Address)?IP ???????? 256 ??????, ??
• ? 203.66.88.89 ??????, ???????????? IP
  ??202.43.195.52 ?? Yahoo!??? IP ???

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??IP ???IP

• ??IP
• 10.0.0.0 10.255.255.255
• 172.16.0.0 172.31.255.255
• 192.168.0.0 192.168.255.255
• ???????????????
• ??????????????????,???? Internet ???
• ???????????,??????????

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??????

• ?????? IP ????????, ???????????, ?????????? ?
  ?????? (FQDN, Fully Qualified Domain
  Name)?????????????????????, ????????, ????????
  WWW ???????????www.flag.com.tw? , ????????? (www)
  ????? (flag.com.tw)
• ? 2 ???

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??????

• ???? (domain name)
• ???? (flag.com.tw) ????????? (flag)????? (com)
  ????? (tw) ?????

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??????

• ????
• ?????????????????????, ?? microsoft (????)?flag
  (????)?ncku (????) ??
• ????
• ????????????????????, ? ?edu? ?????????,?com?
  ????????????

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??????

• ????
• ????????????????????, ????????????????????? tw
  ????jp ????au ?????

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DNS

• DNS????Domain Name System???????????URL???www.hotm
  ail.com????????????DNS?????????????www.hotmail.com
  ?IP???????209.185.243.135??????????????????????IP?
  ???(????0?1?)???www.hotmail.com?????????????

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?????

• ?? IP ?????????????, ??????, ?????????????????????
  ??????? (DNS, Domain Name Server)
  ?????????????????, ???????????? IP ???

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DNS???
?aerosol.ev.ncku.edu.tw
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??????

• ????????? IP ???, ???? Internet
  ??????????????????????????, ?????????????????????
  ??????, ?????????????????????, ????????????,
  ??????????????????

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??????

• ????????????, ????????????????????????????????
  mail.flag.com.tw ??, ????? service,
  ?????????????????????

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??????

• ???_at_??????????(???? ?at?), ?????????????? ??
  mail.flag.com.tw ?????, service ????????

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DHCP(Dynamic Host Configuration Protocol )

• ??????????????????? Ethernet Address ??, ? DHCP
  server ???? ip, netmask, default gateway, dns
  ???.

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DHCP(Dynamic Host Configuration Protocol )
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NAT(Network Address Transform )

• NAT ???????????????? Client ?????? Header ? IP
  ??????? IP ,??? Client ??? Internet ?????!

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?? IP?DNS?DHCP
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?????Proxy

• Proxy Server (???????????)?? User
  ??????????????,????????????,?????,????????????
  Proxy ????,??????????? Proxy Server,? Proxy
  Server ?????????,?????????,???????????????

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Proxy???
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Proxy???
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?A PC??www.edu.tw??????
A
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??????

• ?????

?????