NIELIT O Level Exam

How many layers are there in OSI?

How many layers are there in OSI?

OSI में कितनी परतें होती हैं?

A. 5

B. 4

C. 7

D. 6




Correct Answer is :

C. 7



Explanation

The OSI (Open Systems Interconnection) model consists of seven layers. These layers, from the bottom to the top, are:

  • Physical Layer: Deals with the physical connection between devices and the transmission of raw data over a physical medium.
  • Data Link Layer: Responsible for creating a reliable link between two directly connected nodes, addressing, and error detection.
  • Network Layer: Manages the routing of data packets between devices on different networks, including logical addressing and routing.
  • Transport Layer: Ensures reliable end-to-end communication, including error detection, flow control, and retransmission of lost or corrupted data.
  • Session Layer: Manages sessions or connections between applications, allowing them to establish, maintain, and terminate communication sessions.
  • Presentation Layer: Handles data format translation and encryption/decryption, ensuring that the data sent from the application layer of one system can be understood by the application layer of another.
  • Application Layer: Provides network services directly to end-users or applications, including communication protocols and interfaces for network-aware applications.
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