Trick to remember OSI Model 7 Layers unforgettable shortcut name

 

The OSI (Open Systems Interconnection) Model is a foundational concept in networking that defines how data moves through a network in seven distinct layers. While understanding the functionality of each layer is crucial, remembering the correct order—from Layer 1 (Physical) to Layer 7 (Application)—can be challenging for beginners and even professionals.

 

This article provides easy and unforgettable mnemonics to remember the OSI model layers in both top-down and bottom-up directions. Perfect for students, IT professionals, and job seekers preparing for certifications like CompTIA Network+, Cisco CCNA, or CEH.

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




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.

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Session Layer (DATA)

This layer provides virtual agreement between two end communication devices.

Functions of this layer: Establishment, Management & Termination

The 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, RDBMS

The 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 Sequencing

Protocols 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 Distribution

Protocols of this layer: Routed Protocol: IP/IPX/Apple talk

Routing 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 Data

Uniqueness of this layer: MAC address

Protocols of this layer: PPP, HDLC, ATM, Frame Relay, SLIP, Ethernet



Physical Layer (Binary)

This involves media, move bits between devices

MAC Address: Information Delivered

IP Address: Carrier of Information

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Why Is It Important to Remember the OSI Model?

• Helps in troubleshooting network issues efficiently
• Essential knowledge for networking interviews and IT exams
• Useful in understanding how protocols and devices interact
• Required for certifications and hands-on network configurations

The 7 Layers of the OSI Model (Top to Bottom)

1. Application
2. Presentation
3. Session
4. Transport
5. Network
6. Data Link
7. Physical

Shortcut Mnemonics to Remember OSI Layers

From Layer 7 to Layer 1 (Top to Bottom)

Mnemonic:
"All People Seem To Need Data Processing"

• A – Application
• P – Presentation
• S – Session
• T – Transport
• N – Network
• D – Data Link
• P – Physical

From Layer 1 to Layer 7 (Bottom to Top)

Mnemonic:
"Please Do Not Throw Sausage Pizza Away"

• P – Physical
• D – Data Link
• N – Network
• T – Transport
• S – Session
• P – Presentation
• A – Application

These mnemonics are easy to memorize and widely used in classrooms, corporate training, and tech communities.

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Layer Summary Table

OSI Layer	Layer Number	Mnemonic Initial	Description
Application	7	A	User interface and services
Presentation	6	P	Data formatting, encryption, compression
Session	5	S	Session control and management
Transport	4	T	End-to-end communication, reliability
Network	3	N	Routing and logical addressing
Data Link	2	D	MAC addressing, framing, error detection
Physical	1	P	Physical media and binary data transfer

 

 

Who Should Learn These OSI Mnemonics?

• Students studying networking and computer science
• Job seekers preparing for technical interviews
• Professionals working in tech support, system administration, or cybersecurity
• Educators teaching network fundamentals and certifications

 

 

Benefits of OSI Mnemonics

Benefit	Description
Easy to Memorize	Mnemonics are short, catchy, and intuitive
Exam-Ready Knowledge	Useful for passing networking certification exams
Enhances Understanding	Reinforces the layer-by-layer architecture of data communication
Boosts Troubleshooting Speed	Quickly identify layer-specific network issues
Ideal for Beginners and Experts	A consistent memory tool for all skill levels

 

Top 5 FAQs About Remembering OSI Model Layers

Question	Answer
What is the best way to remember the OSI model?	Use mnemonics like "All People Seem To Need Data Processing".
Do I need to know the OSI model for IT certifications?	Yes, it's a key topic in exams like CompTIA Network+ and CCNA.
Are there other mnemonics for OSI model?	Yes, many exist. Choose one that's easy for you to recall.
Is the OSI model used in real-world networks?	Yes, it's a theoretical model, but helps in design and troubleshooting.
What layer does IP operate at in OSI?	IP operates at Layer 3 – the Network Layer.

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