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Computer Networks
Packet Circuit Switching
Q
Which of the following is not an application layer service?
AA. Network virtual terminal
BB. File transfer, access, and management
CC. Mail service
DD. Error control
Correct Answer:
D. D. Error control
Explanation:
Application layer is the topmost layer in the OSI model. Network virtual terminal, mail service, file transfer, access and management are all services of the application layer. It uses protocols like HTTP, FTP, and DNS etc. to provide these services.