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This is what the ip version 4 header looks like. The top row shows the number of bits taken for each field.
Each feild is decribed in the dictionary.
IPv4 Header
| 4 bits |
4 bits |
8 bits |
3 bits |
13 bits |
| Version |
HLen |
TOS |
Length |
| Ident |
Flags |
Offset |
| TTL |
Protocol |
Checksum |
| SourceAddr |
| DestinationAddr |
| Options(variable) |
Pad(variable) |
IP placement in the OSI model
| Layer |
Name |
Protocols / Terms |
Devices that operate in this layer |
Addresses are called... |
| 3 |
Network |
IP, IPX, AppleTalk |
Routers |
Network Addresses |
| 2 |
Datalink |
Ethernet, Token Ring, PPP, SLIP, HDLC |
Bridges, Switches, Repeaters, Hubs |
Datalink, or MAC* addresses |
| 1 |
Physical |
Unshielded Twisted Pair, Shielded Twisted Pair, Coax, Twinax, Serial cable |
Modems, CSU/DSUs |
N/A (cables don't have addresses) |
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