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By: blahmed
September 23, 2015

An Unforgettable Trick to Remember the OSI Model 7 Layers

By: blahmed
September 23, 2015
blahmed s profile image
By: blahmed
September 23, 2015
It's easy to remember the sequence of OSI Model 7 Layers using this simple sentence: "All people seem to need data processing."

All = Application Layer
People= Presentation Layer
Seem = Session Layer
To = Transport Layer
Need = Network Layer
Data = Data Link Layer
Processing = Physical Layer

Let's look at the layers more closely...

Application Layer (DATA)
Application Layer provides Interface between users and machines.Protocols of this layer are: HTTP, HTTPS, FTP, TFTP, Telnet, SNMP, DNS, Rlogin, SMTP, POP3, IMAP, and LDAP

Presentation Layer (DATA)
This layer facilitates the presentation of Data to the upper layer. Mainly, Provide Encoding Scheme & Encryption formation.Protocols of this layer: JPEG, BMP, GIF, TIF, PNG, MP3, MIDI, ASCII & ANSI etc.

Session Layer (DATA)
This layer provides virtual agreement between two end communication devices.Functions of this layer: Establishment, Management & TerminationThe best example to explain this layer is telephone call in which first you established the connection, then exchange a message and finally terminate the session.Protocols of this layer: SIP, NFS, SQL, ASP, RDBMSThe above three layers are known as the software layer.




Transport Layer (SEGMENT)
This layer is responsible for Control of Data flow and, if an error occurs, reconnect the data and re-transmit.Functions of this layer: Handshaking, Acknowledgement and SequencingProtocols of this layer: TCP, UDP, SPX

Network Layer (Packet)
This layer is used for communication to remote networks.Functions of this layer: Sorting, Filtering and DistributionProtocols of this layer: Routed Protocol: IP/IPX/Apple talkRouting Protocol: IGP, EGP, BGP, EBGP, IBGP, RIP, IGRP, RIP, OPSF, IS-IS

Data Link Layer (Frame)
Function of this layers: Error Detection and Control of DataUniqueness of this layer: MAC addressProtocols of this layer: PPP, HDLC, ATM, Frame Relay, SLIP, Ethernet


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Physical Layer (Binary)
This involves media, move bits between devicesMAC Address: Information DeliveredIP Address: Carrier of InformationThese four layers are Data Flow Layers.

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