Question

which osi layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?

Answer 1

The Application Layer is the OSI layer that serves as the link between the programs used to communicate and the network over which messages are sent (Layer 7).

The Application Layer is in charge of offering services that help user applications directly. It specifies the protocols and interfaces that applications use to connect to network services, and it lets applications running on different hosts talk to each other from end to end.

At the Application Layer, some common protocols are HTTP (Hypertext Transfer Protocol) for browsing the web, SMTP (Simple Mail Transfer Protocol) for sending and receiving emails, and FTP (File Transfer Protocol) for sending and receiving files.