OSI Model
| TCP/IP Model (sometimes referred to as the “Internet model” or the “DOD model” |
OSI Model (OSI/RM) References to James Bond Meets The 7 Layer OSI Model are italicized |
Protocols & Hardware |
|---|---|---|
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TCP/IP stack layer 4 Application Maps to OSI model layer 7 Application, OSI model layer 6 Presentation & OSI model layer 5 Session |
OSI model layer 7 Application Bond receives message from No. 1 |
FTP (21), Telnet (23), SMTP (25), DNS (53), DHCP (67, 68), HTTP (80), POP3 (110), NNTP (119), NTP (123), SMB, TFTP, SNMP, BOOTP, Gopher |
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OSI model layer 6 Presentation Message translated, compressed & encrypted |
Gateway server (sometimes said to operate on all 7 layers of the OSI model) |
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OSI model layer 5 Session Security checks for message completeness |
NetBIOS | |
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TCP/IP stack layer 3 Transport Maps to OSI model layer 4 Transport & OSI model layer 5 Session |
OSI model layer 4 Transport Message broken into smaller packages, combined with others |
TCP, UDP SPX NWLink, NetBEUI AppleTalk Layer 4 Switch |
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TCP/IP stack layer 2 Internet Maps to OSI model layer 3 Network |
OSI model layer 3 Network Bond advised on fastest route |
IP, ICMP, EGMP, ARP, RARP IPX RIP, OSPF, IGRP, EIGRP, EGP, BGP NWLink, NetBEUI AppleTalk Router,Brouter,Routing Switch |
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TCP/IP stack layer 1 Network Access Maps to OSI model layer 2 Data Link & OSI model layer 1 Physical |
OSI model layer 2 Data Link (divided into LLC [top] & MAC [bottom]) Messages placed in special pouch |
IEEE 802.3 Ethernet, IEEE 802.5 TokenRing, X.25, FDDI, ATM LocalTalk Modem, NIC, Bridge, Brouter, LAN Switch |
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OSI model layer 1 Physical Bond gets into his Aston Martin |
Cable, Hub, Repeater, Switching Hub, CSU/DSU, Patch Panel |