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Questions and Answers
Which layer is responsible for breaking down messages into smaller units called Segments?
Which layer is responsible for breaking down messages into smaller units called Segments?
Which layer helps to move packets from one node to another and defines the path they will follow?
Which layer helps to move packets from one node to another and defines the path they will follow?
What is the primary function of the Data Link Layer?
What is the primary function of the Data Link Layer?
Which layer is responsible for providing end-to-end data delivery among hosts?
Which layer is responsible for providing end-to-end data delivery among hosts?
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What is the responsibility of the Physical Layer?
What is the responsibility of the Physical Layer?
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What is the purpose of Segmenting in the Transport Layer?
What is the purpose of Segmenting in the Transport Layer?
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What is the primary purpose of the OSI model?
What is the primary purpose of the OSI model?
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Which layer of the OSI model is responsible for data representation and reformatting?
Which layer of the OSI model is responsible for data representation and reformatting?
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What is the main function of the Session Layer?
What is the main function of the Session Layer?
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What is the primary function of the Transport Layer?
What is the primary function of the Transport Layer?
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What is the payload in the OSI model?
What is the payload in the OSI model?
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Which layer of the OSI model is responsible for providing services to a user?
Which layer of the OSI model is responsible for providing services to a user?
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What is the primary benefit of using the OSI model?
What is the primary benefit of using the OSI model?
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How many layers does the OSI model have?
How many layers does the OSI model have?
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Study Notes
OSI Model Overview
- Developed by ISO in the 1980s to categorize communication layers
- A seven-layer architecture that defines a complete communication system
OSI Model Features
- Provides a big picture of communication over a network
- Shows how hardware and software work together
- Helps understand new technologies as they are developed
- Eases troubleshooting by separating networks
- Enables comparison of basic functional relationships on different networks
OSI Layers
Layer 7: Application Layer
- Describes the interface between two applications on separate computers
- Protocols provide services to users (e.g., browser and Web server) or system (e.g., SNMP for network traffic monitoring)
- Payload: data passed between applications/utility programs and the OS
Layer 6: Presentation Layer
- Helps understand data representation in one form on a host to another host
- Reformat, compress, and/or encrypt data for the receiving application
Layer 5: Session Layer
- Manages and synchronizes conversation between two applications
- Transfers data from source to destination, avoiding data loss
- Streams of data are marked and resynchronized properly
Layer 4: Transport Layer
- Responsible for transporting Application layer payloads
- Functions include multiplexing, segmenting, and splitting data
- Breaks messages into smaller units for efficient handling by the Network layer
Layer 3: Network Layer
- Helps move messages from one node to another
- Defines the path for packets to reach the destination
Layer 2: Data Link Layer
- Takes raw transmission data and makes Data Frames
- Checks for transmission errors and corrects them
- Sends Data Frames to the upper layer and vice versa
Layer 1: Physical Layer
- Deals with hardware technology and actual communication mechanisms
- Converts digital/analog bits into electrical or optical signals
- Performs data encoding
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Description
Learn about the Open Systems Interconnection (OSI) reference model, a seven-layer architecture developed by ISO for categorizing communication layers. Understand its features and how it enables communication over a network.
