Borland C Builder (BCB)

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Ethernet ?? ?????
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IEEE 802

• ??OSI???????????
• IEEE 802.1 IEEE 802.19
• IEEE 802.3EtherNet
• IEEE 802.4Token Bus
• IEEE 802.5Token Ring

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EtherNet

• ????????????
• DIX (EtherNet 2.0) ? IEEE 802.3????
• ???????CSMA/CD??
• CSCarrier Sense ????
• MAMultiple Access ????
• CDCollision Detection ????

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CSMA/CD ????

• ?????,???????????????,?????????
• CSMA/CD ???????????????, ??????????????, ????????
• ??????????(CS)???????,??????????, ???????????

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????(Collision)

• ?????????????, ????????(Collision)?
• ?????, ??????????? ( Backoff ) ?????(CD)?
• ?????2???, ?????????????, ??16????????

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CSMA/CD??
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EtherNet?? 4 ???

• ?????
• ???????
• ?????
• ?????

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MAC ?????

• ??????????(Broadcast)???????
• ???????, ????????, ?????????, ????????
• ??????????????????????, ???? Ethernet
  ??????????????MAC ( Media Access Control ) ????

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MAC ?????

• ??????????? MAC ??????? MAC ????
• ????????? MAC ????, ????????????????
• ???????, ?????????????, ?????????

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MAC ?????

• ??? Ethernet ??????, ???? MAC ???????? ROM ?
  EEPROM ??
• MAC ??? 6 Bytes ??, ? 3 ? Bytes
  ?????,?3?Bytes???????
• ??????????????????? MAC ???
• Ipconfig/all

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EtherNet 2.0??????
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EtherNet????
????
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Preamble (??)

• ? 7 ? Byte ???101010???????,?????????
• ? 8 ? Byte(? 802.3 ????? SFD ??)????10101011,?????
  ??????,???????(???????????)????????????

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Destination Address (????)

• ???????? MAC ???
• ? 3 Bytes ?????, ? 3 Bytes ?????
• ?0xFFFFFFFFFFFF?(?? Bit ?? 1)??????????????,
  ?????????????????

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Source Address (????)

• ???????? MAC ???
• ???????????? MAC ??, ?????????

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Type (????)

• ???????(???)???????
• ??0x0800??IP?0x8137 ?? IPX?
• ?????????? TCP/IP?IPX?NetBeui ?????,
  ????????????????????

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Data (??)

• ??? Payload?
• ??? 46 Bytes ? 1500 Bytes?
• ??46 Bytes??0
• ??1500 Bytes?????????

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FCS(Frame Check Sequence, ??????)

• ??????(???)????? CRC (Cyclic Redundancy Check) ??
• ??????????, ?????? CRC ?, ????? CRC ?????,
  ????????????

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802.3 ???????
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?????????????

• ????????, ??????????????????????
• ????????????
• ? Windows 2000 ??, ?? IP ? ARP, ?????? Ethernet
  2.0 ? 802.3 ???????, ??? NetBIOS?AppleTalk ???
  802.3 ??????

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Ethereal??
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EtherNet 2.0 ???????