Which of the following layers is an addition to OSI model when compared with TCP IP model?

Category: Miscellaneous Indian Gk

Hint: Consider the layers unique to the OSI model.

Correct Answer: D) Session and Presentation layer.

Exam Relevance: UPSC, SSC, Banking, Railways

Difficulty: Moderate

Explanations:

Application Layer: This layer is responsible for providing network services to applications, such as file transfer, email, and web browsing.

Presentation Layer: This layer is responsible for data representation and encryption. It ensures that the data sent from the application layer is in a format that can be understood by the receiving application.

Session Layer: This layer is responsible for establishing, maintaining, and terminating connections between applications. It manages the dialogue control and synchronization between the applications.

Transport Layer: This layer is responsible for end-to-end data transfer. It ensures that data is transmitted reliably and in the correct order.

Network Layer: This layer is responsible for routing data between different networks. It determines the best path for data to travel from the source to the destination.

Data Link Layer: This layer is responsible for transmitting data over a physical link. It ensures that data is transmitted without errors and in the correct order.

Physical Layer: This layer is responsible for the physical transmission of data over a medium, such as copper wire, fiber optics, or wireless signals.

Application Layer: This layer is responsible for providing network services to applications, similar to the OSI model.

Transport Layer: This layer is responsible for end-to-end data transfer, similar to the OSI model.

Internet Layer: This layer is responsible for routing data between different networks, similar to the Network Layer in the OSI model.

Link Layer: This layer is responsible for transmitting data over a physical link, similar to the Data Link Layer and Physical Layer in the OSI model.

Option Analysis:

Option A: Incorrect. The Application layer is present in both the OSI and TCP/IP models, so it is not an addition unique to the OSI model.
Option B: Incorrect. The Presentation layer is unique to the OSI model, but it is not the only layer that is not present in the TCP/IP model.
Option C: Incorrect. The Session layer is unique to the OSI model, but it is not the only layer that is not present in the TCP/IP model.
Option D: Correct. The Session and Presentation layers are unique to the OSI model and do not have direct equivalents in the TCP/IP model.

Mnemonic: OSI has more layers: "Some People Have Coffee Before Lunch" (Session, Presentation, etc.)

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