Application layer - meaning and definition. What is Application layer
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What (who) is Application layer - definition

HIGHEST LAYER OF A NETWORKED COMMUNICATION MODEL
OSI layer 7; Application protocol; Application service; Layer7; OSI Layer 7; Application Layer; Application-layer; Specific application service element

application layer         
<networking> The top layer of the OSI seven layer model. This layer handles issues like network transparency, resource allocation and problem partitioning. The application layer is concerned with the user's view of the network (e.g. formatting electronic mail messages). The presentation layer provides the application layer with a familiar local representation of data independent of the format used on the network. (1994-11-28)
Application-layer framing         
PROTOCOLS CONSTRUCTED AT THE APPLICATION LAYER
Application level framing; Application layer framing
Application-layer framing or application-level framing (ALF) is a method of allowing an application to use its semantics for the design of its network protocols.
Application firewall         
A FORM OF FIREWALL THAT CONTROLS INPUT/OUTPUT OR SYSTEM CALLS OF AN APPLICATION OR SERVICE
Application layer firewalls; Application Layer Filtering; Application-layer firewall; Application-level firewall; Application level firewall; Database firewall; Application layer firewall; Transparent firewall
An application firewall is a form of firewall that controls input/output or system calls of an application or service. It operates by monitoring and blocking communications based on a configured policy, generally with predefined rule sets to choose from.

Wikipedia

Application layer

An application layer is an abstraction layer that specifies the shared communications protocols and interface methods used by hosts in a communications network. An application layer abstraction is specified in both the Internet Protocol Suite (TCP/IP) and the OSI model. Although both models use the same term for their respective highest-level layer, the detailed definitions and purposes are different.