19- The two layers not found in the Internet protocol stack (TCP/IP):

presentation: Allow applications to interpret meaning of data, e.g., encryption, compression, machine-specific conventions.

session: Synchronization, check pointing, recovery of data exchange.

Internet stack “missing” these layers!

These services, if needed, must be implemented in the network layer.

Question

19- The two layers not found in the Internet protocol stack (TCP/IP):

presentation: Allow applications to interpret meaning of data, e.g., encryption, compression, machine-specific conventions.

session: Synchronization, check pointing, recovery of data exchange.

Internet stack “missing” these layers!

These services, if needed, must be implemented in the network layer.

BlackTom AI · Accepted Answer

The statement that the presentation and session layers are not found in the Internet protocol stack (TCP/IP) is true. The TCP/IP model, which is the foundation of the Internet, consists of four layers: the application layer, transport layer, internet layer, and network interface layer. Unlike the OSI model, which has seven layers including the presentation and session layers, the TCP/IP model does not explicitly define these two layers.

The presentation layer in the OSI model is responsible for translating data between the application layer and the network format, handling tasks such as data encryption, compression, and translation of machine-specific conventions. The session layer manages sessions between applications, providing synchronization, checkpointing, and recovery of data exchange. In the TCP/IP model, these functionalities are typically handled by the application layer or within specific applications themselves, rather than being defined as separate layers.

Therefore, the statement is false because it incorrectly suggests that these services must be implemented in the network layer. Instead, they are typically implemented at the application layer or by the applications themselves, not the network layer. The network layer in the TCP/IP model is primarily concerned with routing and forwarding packets across the network, not with data interpretation or session management. This is why the correct answer is 'False', as the statement misattributes where these functionalities should be implemented.

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