NetGod

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NetGuru by NetSmooth Corporation
PART I TCP/IP????????/?NetGuru??
??? ????
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Overview

• ????
• ???? (Topology)
• ????????
• ?????TCP/IP??
• ????(Ethernet)??

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????
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????

• ???????,???????????(?????????)???????,?????(??????
  ??CPU ?????????)??????

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??????(Connectivity)

• ????
• ??( link )
• ?????????
• ??( node )
• ????????????(??)
• ????
• ???( point-to-point )????
• ????( multiple-access)????

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• ????
• ???( point-to-point )????(????)
• ?????(End-to-End)????(?????)

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????

• Unicast (????)
• Multicast (??)
• Broadcast (??)

broadcast
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????(Switched Network)

• ???? (circuit-switched)
• ?????????
• ???? (packet-switched)
• ????
• ???????????(packet)??,???????????
• store-and-forward

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??(Multiplexing)

• ??????(Time-Division Multiplexing, TDM)
• ????(Frequency-Division Multiplexing, FDM)

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?????????
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Internet internetwork

• ????( Internet )
• ???TCP/IP????
• ????( internetwork )
• ???????(???)???????????

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???? (Topology)

• ??? ( Bus ) ??
• ?? ( Star ) ??
• ?? ( Ring ) ??

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??? ( Bus ) ??
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??? ( Bus ) ??
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?? ( Star ) ??
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?? ( Star ) ??
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?? ( Ring ) ??
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?? ( Ring ) ??
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????????
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????????,?ADSL ??
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???????????,???Internet???
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?????????????
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?????????????(T1???)
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??????
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??VPN ????
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NetGuru????????
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NetGuru???????
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?????TCP/IP??
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OSI 7 Layer Reference Model

• ISO ? OSI 7 Layer Reference Model ??????????????
• ISO ? International Organization for
  Standardization ????????
• OSI ??Open System Interconnection,OSI 7 Layer
  ??????????,??TCP/IP ???????????????????
• OSI Model ? TCP/IP???
• ?????????

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OSI 7 Layer ? TCP/IP Protocol Stack
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??(Layering)???

• peer-to-peer??(???????)
• ????,????
• service interface(?????)
• ??????????????header(Protocol),??????(Encapsulatio
  n)
• ?TCP/IP ??? TCP ? Packet ??

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Peer-to-Peer ??
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????Layer 1???
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????Layer 2 ?????
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????Layer 3 ?????
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TCP/IP Suite ???
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????(Ethernet)
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??

• ????????????
• ??????(Media)
• 10BaseT ? 100BaseT ?? 8 ?(4 ??)?UTP (Unshielded
  Twisted Pair ??????)???
• ??? RJ-45,??? TIA/EIA 568A ?????? EIA/TIA 568B
  ??(Crossover)??

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Category 5?????
???Ethernet ???????,??????????????,?????????????,?
??????????????????,????????RJ-45??,???????????,??
?????,????100?
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Category 5?????

• EIA/TIA
• ??
• ???568A 568A / 568B 568B
• ??? Hub / Switch ???
• ??568A 568B / 568B 568A
• ???? Hub / Switch ????????????

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?????????

• ??White-Orange ??Transmit (??) ,Orange
  ??Transmit- (??-),? White-Green ??Receive (??),
  Green ??Receive- (??-)?
• ????-??????????(Differential Circuit)
  ?-,??????????(Common Mode Noise)
• ??????TX ????RX,??TX- ????RX-
• ????HUB (?Uplink Port),?HUB ??HUB ???Uplink
  Port??EIA/TIA 568B ?????????????? HUB Port??1,2 ?
  RX,RX-? 3,6 ? TX,TX-
• ???????????Uplink Port, ?HUB ??HUB??Uplink
  Port,??????EIA/TIA 568A Crossover ??

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??HUB???(Straight)?????
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??Crossover?????
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??????
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??? ??? (Physical Layer)

• ???????????????????
• ????(Cable) ???(Fiber)????(Twisted
  Pair)????????,?????????????????

??
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??? ????? (Data Link Layer)

• ????????(node-to-node)??????????????

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• ??????????????????????????(Frame),????????????????
  ???????????????????? (Flow Control)?
• ??Ethernet???????? 48 bits???,???????? (MAC
  Address ?? Physical Address)
• ?? MAC ?? Media Access Control (?????? ??????)?

??
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??? ??? (Network Layer)

• ?????Packet ??? (Routing) ????? (Route),?????
  (Fragmentation) ??
• ?????????,???????????TCP/IP??IP(Internet
  Protocol,????????)?
• ??????,??????????IP Address?IP ????????IP ?
  123.132.211.1 ????????
• ??????,???????????,?????best effort??????,????????
  ,?????(???TCP/UDP)???

??
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??? ??? (Transport Layer)

• ??????? (Connection Establishment /Tearing Down)
• ?TCP (Transmission Control Protocol)
• ????? (End-to-End)????? (Flow Control)
• (??Node-to-Node Flow Control)
• ???? (Congestion Control)

??
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??? ??? (Session Layer)

• ??Layer 5?????????????????????????? (Logical
  Link)
• ??Microsoft NetMeeting?MSN ??????Session ???
• ???????OSI 7 layer??reference Model,???Microsoft
  NetMeeting?MSN ????? H.323,SIP (Session
  Initiation Protocol, RFC 3261),???????
  (??SIP),?????OSI Session Layer
• ??Session ??????????Session??????????????????????
  ???????????

??
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??? ??? (Presentation Layer)

• ???????????????????
• ???????? (Character Sets),???????????
  Base64?Uuencode?MIME type,???????? (File
  Structure)???????????
• ??????????,?????????????????
• XDR (External Data Representation) ???????????
  NFS (Network File System) ??????????????,?????????
  ???Presentation Layer????????? (Local) ????? ?

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??? ??? (Application Layer)

• ?????????,??????,????????????Layer 7 ???????
  Layer 7 ???
• ??E-mail (SMTP-Simple Mail Transport Protocol,
  POP 3 ) FTP (File Transfer Protocol)?Vo IP (Voice
  over IP)??
• ??? Application ????,??????(?????????????)????????
  ?????

??