Which of the following protocols resides in the Application TCP/IP Architecture layer?

(A) SMTP
(B) TCP
(C) Ethernet
(D) IP

Answer:

SMTP is the correct answer. The TCP/IP application layer protocol provides services to the application software running on a computer. The application layer does not define the application itself, but it defines services that applications need. In short, the application layer provides an interface between software running on a computer and the network itself.