Table T-2: TCP/IP Protocol Suite OSI Layer ARPA Layer Protocol 7 Application Process/ FTP SMTP SNMP TELNET Application File Transfer Simple Simple Net- Telecommunications 6 Presentation Protocol Mail Transfer work Manage- Network 5 Session Protocol ment Protocol 4 Transport Host-to-Host TCP UDP Transmission Control Protocol User Datagram Protocol 3 Network Internet ARP ICMP IP Address Resolution Internet Control Internet Protocol Protocol Message Protocol 2 Data Link Network LAN, MAN, WAN Network Interface Card (NIC) Interface 1 Physical Transmission Media 74570c20.qxd 9/12/07 12:44 AM Page 479 |