7 Layers of OSI Architecture1. Application Layer2. Presentation Layer3. Session Layer4. Transport Layer5. Network Layer6. Link Layer7. Electrical/Physical1. Application LayerResponsible
for END-USER friendly protocols, like HTTP, FTP, TELNET etc. Software
developers directly interact with this layer of protocol to write
2. Presentation LayerResponsible
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 LayerResponsible for maintaining a REGISTRY of all currently active connections from various HOSTS (computers).4. Transport LayerResponsible
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 LayerResponsible
for providing LOGICAL paths for data packets to pass through. It
basically provides SWITCHING & ROUTING facilities.
6. Link LayerResponsible for encoding & subsequent decoding of data packets at various network points.
for defining various electrical standards, like standardized cables,
Bit Stream Standards etc, to be used while communicating between HOSTS