application layer functionality
someone please throw some light on this sentence in todd-lammle book regarding the functionality of the application layer:
"application layer is responsible for identifying and establishing the availability of intended connection partner and determines that whether the essential resources for the intended communication are available or not!"
i couldnt get it as how the application layer even has any idea regarding what the resources will be used at any lower layer!!!
please explain it to me.
thanks and regards.