Network Layered Architecture

Network Process and Layered Architecture

• Dividing a network process into small tasks enhances modularity and simplifies problem-solving by isolating functionality.
• Layered architecture promotes separation of concerns, minimizing interdependencies between layers.

Key Principle of Layered Architecture

• A fundamental principle is to ensure that each layer serves a specific function, allowing for easier updates and maintenance.

Basic Elements of a Layered Model

• The basic elements include layers, protocols, and interfaces, which define interactions and data flow between layers.

Open Systems Interconnection (OSI) Model

• The OSI model serves as a conceptual framework to standardize communication functions in telecommunication or computing systems.
• Its main purpose is to facilitate interoperability between diverse system architectures.

Open System in OSI Context

• An open system refers to a system that adheres to internationally accepted standards to enable communication and data exchange with other systems.

Introduction of the OSI Model

• The OSI model was first introduced in 1984 by the International Organization for Standardization (ISO).

Primary Purpose of the OSI Model

• The primary purpose is to provide a universal standard for network communication, ensuring different systems can work together seamlessly.

Layers in the OSI Reference Model

• The OSI reference model consists of seven layers, each with distinct responsibilities.

Transport Layer (Layer 4) Function

• The transport layer is responsible for end-to-end communication, error recovery, and flow control between devices.

Process of Adding Headers or Trailers

• The term for adding headers or trailers at each layer is "encapsulation," which prepares the data for transmission between layers.

OSI Layers Subgroup Division

• The OSI layers can be divided into three subgroups: application, transport, and network layers, each serving different aspects of networking.

Trailer Addition Layer

• Trailers are commonly added at the data link layer (Layer 2), ensuring error detection and control at the link level.

Test your knowledge on the layered architecture of network models, where each task is assigned to a dedicated layer to reduce design complexity and ensure independence of layers.