Which of the following is/are example (s) of stateful application layer protocols?
(i) HTTP (ii) FTP
(iii) TCP (iv) POP3
A
(i) and (ii) only
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B
(ii) and (iv) only
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C
(ii) and (iii) only
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D
(iv) only
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Solution
The correct option is B (ii) and (iv) only FTP has control and data connection it requires authorization. HTTP is stateless protocol. TCP is not application layer but it is stateful. POP3 is application protocol and it gets state with help of TCP.