Global MCQ Practice

Part of: Miscellaneous Indian Gk set 200

The number of layers in ISO OSI reference model is .....

Category: Miscellaneous Indian Gk

Hint: Recall the standard model used in computer networking.

Correct Answer: B) 7

Exam Relevance: GATE, GRE, CAT, UPSC

Difficulty: Easy

Explanations:
  • Physical Layer (Layer 1): This layer is responsible for the physical transmission of data over a communication channel. It deals with the electrical, mechanical, and functional specifications for the transmission medium, such as cables, connectors, and signal types.
  • Data Link Layer (Layer 2): This layer ensures that data is transmitted error-free from one node to another over a physical link. It handles the framing of data, error detection, and flow control.
  • Network Layer (Layer 3): This layer is responsible for the routing of data between different networks. It determines the best path for data to travel from the source to the destination, using routing protocols and addressing schemes.
  • Transport Layer (Layer 4): This layer ensures the reliable transmission of data between end systems. It handles segmentation, reassembly, flow control, and error recovery.
  • Session Layer (Layer 5): This layer manages the establishment, maintenance, and termination of sessions between applications. It provides mechanisms for synchronization and checkpointing.
  • Presentation Layer (Layer 6): This layer is responsible for the representation of data. It handles data encryption, decryption, compression, and decompression.
  • Application Layer (Layer 7): This layer provides services to end users and applications. It includes protocols for email, file transfer, and web browsing.
    • Option Analysis:
    • Option A: This option is incorrect. The ISO OSI reference model has 7 layers, not 5. The 5-layer model is often confused with the TCP/IP model, which has fewer layers.
    • Option B: This option is correct. The ISO OSI reference model consists of 7 layers, each serving a specific function in the communication process.
    • Option C: This option is incorrect. The ISO OSI reference model has 7 layers, not 10. The 10-layer model is not a standard in computer networking.
    • Option D: This option is incorrect. The ISO OSI reference model has 7 layers, not 6. The 6-layer model is not a standard in computer networking.

    Mnemonic: Seven layers: Physical, Data Link, Network, Transport, Session, Presentation, Application.

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