Question: a mac address is used on what layer of the osi model

title: OSI model
text: The application layer is the OSI layer closest to the end user , which means both the OSI application layer and the user interact directly with the software application . This layer interacts with software applications that implement a communicating component . Such application programs fall outside the scope of the OSI model . Application - layer functions typically include identifying communication partners , determining resource availability , and synchronizing communication . When identifying communication partners , the application layer determines the identity and availability of communication partners for an application with data to transmit . The most important distinction in the application layer is the distinction between the application - entity and the application . For example , a reservation website might have two application - entities : one using HTTP to communicate with its users , and one for a remote database protocol to record reservations . Neither of these protocols have anything to do with reservations . That logic is in the application itself . The application layer per se has no means to determine the availability of resources in the network .