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Network Introduction - PowerPoint PPT Presentation

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Network Introduction

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  1. Network Introduction

  2. Packet Switch Network IP IP IP client IP IP IP IP TCP Data Ether Server

  3. OSI 7 Layer v.s. TCP/IP Protocol Stack

  4. application: supporting network applications FTP, SMTP, STTP transport: host-host data transfer TCP, UDP network: routing of datagrams from source to destination IP, routing protocols link: data transfer between neighboring network elements PPP, Ethernet physical: bits “on the wire” application transport network link physical Internet protocol stack

  5. Demultiplexing application application application application ICMP IGMP TCP UDP ARP IP RARP Ethernet incoming frame

  6. Protocol Encapsulation Ethernet 封包格式 Data Upper layer Data TCP Header Data TCP layer IP layer IP Header TCP Header Data 46 ~1500 bytes Ethernet Header IP Header TCP Header Data Ethernet Trailer Ethernet layer 6-byte 6-byte 2-byte 4-byte Destination MAC Source MAC Frame Type CRC-32 0800: Data is IP packet 0806: Data is ARP packet