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Explain services of Application Layer.
Application Layer:
As the highest layer within the OSI reference model, the application layer gives services to the users of OSI environment. The layer gives services as follows:
a. Electronic mail or message handling service
b. Directory services
c. Cost allocation
d. Determination of quality of service
e. File transfer and management
f. Editors and terminal support services
g. Telematic services like videotext.
Explain Yet another Compiler-Compiler. YACC uses for "Yet another Compiler-Compiler": Computer program input usually has some structure; actually, all computer programs which
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