Routing

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

• Routing

?????? ???? e-mail prakai_at_nec.rit.ac.thHomepag
e http//www.nec.rit.ac.th/staff/prakai ?????????
??????? ?????????????????????? ???????????????????
??????????
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Routing ???????

• ?????????????????????????????????????????????????
  ???????????????
• ??????????????????? ???????? (Router)
• ?????????????? 3 ??????????? OSI ???? TCP/IP

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IP Routing

• ?????????????????????????????? IP RoutingRouter
  ??? IP ???????????????????????????????????????????
  ????? ??????????
• ????????????????? IP

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

• ?????????????????????? LAN
• ?????????????????????? WAN

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

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

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?????????????????????? Internet ???????????

• ISOC Internet Society. ?????????????????????????
  ???????????????? Internet ????????????????????????
  ??
• IAB Internet Architecture Board.
  ????????????????? ?????? ISOC
• IETF Internet Engineering Task Force.
  ????????????????????????????????????????????????
  Internet
• IRTF Internet Research Task Force.
  ??????????????????????????????????????????????????
  ?????

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?????????????? Internet

• DDN (Defense Data Network) ?????????????????????
  ?? ???????????????????????????????? Internet
• DDN NIC (Network Information Center)
• IANA (Internet Assigned Numbers Authority)
• NOC (Network Operations Center)

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??????????????????????
RFC
Internet Draft
ProposedStandard
Draft Standard
Official Standard
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??????????????????? Internet

• ????????????????? Internet ???????????????????????
  ??? 5 ?????
• Required
• Recommended
• Elective
• Limited use
• Not recommended

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????????? Internet

• RFC (Request For Comment)
• STD (Standard)
• FYI (For Your Information)

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

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

Application
Application
Presentation
Session
Transport
Transport
Internet
Network
Network
Data Link
Physical
Physical
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?????????? TCP/IP

Application
FTP TELNET SMTP TFTP NFS NTPSNMP
NNTP DNS BOOTP DHCPHTTP X-windows
Transport
TCP
UDP
Internet
IP
Network
Network Driver Software
Physical
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??????????????????????????????

• ????????????????????????????????? ???????????? 2
  ??????
• Connection-oriented ????????????????????????????
  ????????????????????????????? (TCP)
• Connectionless ?????????????????????????????????
  ???????????????????????????? (UDP)

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

• ??????????????????????????????????????????
• FTP 20, TELNET 23, SMTP 25, HTTP 80
• ????????????????????????????????
• 0 ??????
• 1-255 ??????????????????????????????????????????
  
• 256-1023 ????? ???????????????
• 1024-65535 -- ??????????????????????
• ?? Unix ??????????????????????????? /etc/services

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?????