1. Physical
2. Data link
3. Network
4. Transport
5. Session
6. Presentation
7. Application
Session and Presentation Layers
Protocols at each of the OSI layers govern how they are to talk to each other. Each layer of the OSI model has different responsibilities and they may have multiple protocols that they could use. The sender and receiver in networks must agree on a common ground for communication, which is the protocol. Depending on what you are trying to accomplish there are different protocols at different layers of the OSI model. Basically, you need the two systems to agree on how to do that. That is the role of a protocol.
Gateways work on all seven OSI layers . The main job of a gateway is to convert protocols among communications networks.
FTP uses TCP, which uses IP
Application Presentation Session
upper-layer connection-oriented protocols
International Standards Organization (ISO) developed a proposal for OSI model as a first step towards international standardization of the protocols used in the various layers. The model is known as the ISO OSI (Open Systems Interconnection).The OSI model includes seven layers
an upper-layer, connection-oriented protocol or service
The cake had seven different layers.
The people were told to follow protocols in a crisis.
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design issues of layers are basically dealing with protocols and designing for efficiency.also differentiating between interfaces ,services and protocols is essential.in layered architecture function of each layer should be defined.