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Name 7 layers of OSI models and define their functionality. 7 Layers of OSI Architecture
1. Application Layer
2. Presentation Layer
3. Session Layer
4. Transport Layer
5. Network Layer
6. Link Layer
7. Electrical/Physical
1. Application Layer
Responsible for END-USER friendly protocols, like HTTP, FTP, TELNET etc. Software developers directly interact with this layer of protocol to write programs. 2. Presentation Layer
Responsible for isolating different Data formats from each other. Ex.: Encryption process involves the AUTOMATIC conversion of application data format to network format & vice-versa. 3. Session Layer
Responsible for maintaining a REGISTRY of all currently active connections from various HOSTS (computers).
4. Transport Layer
Responsible for TRANSPARENT flow of data between HOSTS (Computers), without due consideration to HARDWARE details. This layer is not concerned as to which applications are sharing data; rather it is only concerned with TRANSFERRING DATA PACKETS FROM ONE POINT TO ANOTHER. 5. Network Layer
Responsible for providing LOGICAL paths for data packets to pass through. It basically provides SWITCHING & ROUTING facilities. 6. Link Layer
Responsible for encoding & subsequent decoding of data packets at various network points. 7. Electrical/Physical
Responsible for defining various electrical standards, like standardized cables, Bit Stream Standards etc, to be used while communicating between HOSTS (computers).
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