DoD model
The DoD model (DoD, Department of Defense) is a layered abstract description for communications and computer network protocol design. It was created in the 1970s by DARPA for use in developing the Internet's MAC addresses of the network cards in an Ethernet.
- Layer 2 - internet protocol. This layer defines IP numbers, with many routing schemes for navigating packets from one IP address to another.
- Layer 3 - the host-to-host layer. This is where flow-control and connection protocols exist, such as TCP. This layer deals with opening and maintaining connections, ensuring that packets are in fact received.
- Layer 4 - the process layer. This is where the "higher level" protocols such as SMTP, FTP, SSH, HTTP, etc. operate.
See also
