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Questions and Answers
What is the main purpose of dividing a network process into small tasks in a layered architecture?
What is a key principle in designing a layered architecture?
What are the basic elements of a layered model?
What is the main purpose of the Open Systems Interconnection (OSI) model?
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What is an open system in the context of the OSI model?
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When was the Open Systems Interconnection (OSI) model first introduced?
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What is the primary purpose of the OSI model?
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How many layers are in the OSI reference model?
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What is the function of the transport layer (Layer 4)?
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What is the term for the process of adding headers or trailers to the data unit at each layer?
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What are the three subgroups that the OSI layers can be divided into?
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At which layer is the trailer commonly added?
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Study Notes
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.
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Description
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.
