Concept of layering
What is Concept of layering?
A distinct level in a hierarchical system, each performing a specific function in network communication.
Key points
- Understand the rationale behind network layering.
- Identify the functions of different layers in standard models (OSI, TCP/IP).
- Explain the process of data encapsulation and decapsulation.
- Appreciate the benefits of a layered architecture.
Common exam trap
Confusing the order of layers between OSI and TCP/IP models.
Definitions
- Term
Layer
- Meaning
A distinct level in a hierarchical system, each performing a specific function in network communication.
- Term
Protocol
- Meaning
A set of rules governing the exchange or transmission of data between devices.
- Term
Encapsulation
- Meaning
The process of adding control information (headers) to user data as it passes down the protocol stack.
- Term
Decapsulation
- Meaning
The process of removing control information (headers) from received data as it passes up the protocol stack.
Learning objectives
Understand the rationale behind network layering.
Identify the functions of different layers in standard models (OSI, TCP/IP).
Explain the process of data encapsulation and decapsulation.
Appreciate the benefits of a layered architecture.
Prerequisites
Basic understanding of data transmission.
Familiarity with the concept of protocols.
Common mistakes
Confusing the order of layers between OSI and TCP/IP models.
Not understanding the role of encapsulation and decapsulation.
Assuming a layer needs to know about all other layers.
Overlooking the importance of interfaces between layers.
Keywords
Layering
OSI Model
TCP/IP Model
Protocol Stack
Encapsulation
Decapsulation
Network Architecture
Abstraction
Practice preview
In the context of the OSI model, which layer is primarily responsible for logical addressing and routing of packets?…
easy
What is the main benefit of using a layered architecture in network protocols?…
medium
When data is passed down from the Application Layer to the Physical Layer in the OSI model, what typically happens?…
medium