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• Name 7 layers of OSI models and define their functionality.

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1. Submitted By: Fish25 — October 6, 2006 +11 votes   + -

   Layer# name Functionality
   7 Application program-to-program communication
   6 Presentation Manages Data representation and conversions
   5 Session Establishing and maintaining communications channels
   4 Transport end-to-end integrity of data transmission
   3 network Routes data from one node to another
   2 data link physically passes the data from one node to another
   1 physical putting the data on the network media and taking the data off

3. Submitted By: sandeepthool — October 6, 2006 +6 votes   + -

   7 Layers of OSI Architechture
   —————————–

   1. Application Layer
   2. Presentation Layer
   3. Session Layer
   4. Transport Layer
   5. Network Layer
   6. Link Layer
   7. Electrical/Physical

   7. Electrical/Physical
   ———————-
   Responsible for defining various Electrical
   standards, like standardized Cables, Bit
   Stream Standards etc, to be used while
   communicating between HOSTS (Computers).

   6. Link Layer
   ————-
   Responsible for Encoding & subsequent
   De-Coding of Data Packets at various
   Network points.

   5. Network Layer
   —————-
   Responsible for providing LOGICAL paths for
   Data packets to pass through. It basically
   provides SWITCHING & ROUTING facilities.

   4. Transport Layer
   ——————
   Responsible for TRANPARENT 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-

   3. Session Layer
   —————-
   Responsible for maintaining a REGISTRY of
   all currently active connections from
   various HOSTS (Computers).

   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.

   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.

4. Submitted By: Aditi — October 15, 2006 +12 votes   + -

   I have one interesting line to remember all these layer names,hope this will help!! :-

   Please (Physical)
   Do (Data Link)
   Not (Network)
   Touch (Transport)
   Steve’s (Session)
   Pet (Presentation)
   Alligator (Application)

5. Submitted By: Stuart Forbes — April 11, 2007 +2 votes   + -

   We were given the saying “Please Do Not Throw Sausage Pizza Away,” Physical, Data link, Network, Transport, Session, Presentation, Application. Having it relate to food seemed to help.

6. Submitted By: rama — July 9, 2007 not yet rated   + -

   a short cut way to remember the 7 layers

   Please (Physical)
   Do (Data Link)
   Not (Network)
   Trust (Transport)
   Sales (Session)
   Persons (Presentation)
   Advise (Application)

7. Submitted By: s.nithya lakshmi — August 2, 2007 not yet rated   + -

   physical layer-to program communication

8. Submitted By: Rupinderjitsingh — November 5, 2007 not yet rated   + -

   For all punjabi Guys

   A-nu
   P-reet
   S-ingh
   T-ruck
   N-aal
   D-elhi
   P-ahuncheya

10. Submitted By: Jim — May 1, 2008 not yet rated   + -

    Here’s one that worked for me
    Application = All
    Presentation = People
    Session = Should
    Transport = Transport
    Network = Network
    Data= Data
    Physical = Physically

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