MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Summary. The application layer is the topmost layer of the protocol hierarchy. It is the layer where actual communication is initiated. It uses the services of the transport layer, the network layer, the data link layer, and the physical layer to transfer data to a remote host.

Detailed explanation-2: -The Application Layer enables the user, whether human or software, to access the network. It provides user interfaces and support for services such as e-mail, shared database management and other types of distributed information services.

Detailed explanation-3: -Explanation: The services provided by the application layer are network virtual terminal, file transfer, access and management, mail services, directory services, various file and data operations.

Detailed explanation-4: -The application layer sits at Layer 7, the top of the Open Systems Interconnection (OSI) communications model. It ensures an application can effectively communicate with other applications on different computer systems and networks.