Application Layer Solved MCQs Questions Answers

By: Prof. Dr. Fazal Rehman | Last updated: May 2, 2025

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1. Who translates internet domain and host names to IP address?



2. Which allows a user at one site to establish a connection to another site?



3. Which will define Application layer protocol?



4. Which one protocol delivers/stores mail to receiver server?



5. ASCII __________ encoding of binary data.



6. __________ is an internet standard protocol.



7. Which DNS client maps an address to a name, especially when required a host?



8. Which one option from following Application-level protocol plays a crucial role in addition to X-500 features?



9. Which of the following intermediaries get involved during the transfer function of an e-mail system?



10. ________ among the below specified illustrations is the category of GUI?



11. Which phase/s of POP3 allow/s a user agent to retrieve the messages for deletion purpose?



12. ___________ URL method of HTTP performs a similar function as that of PUT, an exception of request.



13. ____________ language in WWW specifies a web’s way by three-dimensional objects?



14. Which field of cookie in WWW represents the server’s directory structure?



15. Which of the following among the below mentioned protocols provides a mechanism of acquiring an IP address?



16. Which is the important application of the application layer?



17. The TCP/IP corresponds to the combined session, presentation, and application layers of the OSI model.



18. Which protocol is based on end-to-end delivery?



19. The well-known port of SMTP server is __________.



20. _________ is a summary of the message being sent, which is specified by the sender.



21. In SMTP header field is added by the final transport system.



22. In SMTP mail transaction flow, the sender SMTP establishes a TCP connection.



23. In SMTP mail transaction flow, a message is sent, to which the receiver will identify itself.



24. ___________ is a command-line tool designed for most UNIX-like operating systems.



25. Which are the components of sendmail?



26. The _________ is the interface which a user can read and send mail.



27. The _______ acts like a mail router, accepting messages from both MTAs and MUAs.



28. Which uses a queuing system to manage inbound and outbound mail?



29. _________ sender SMTP establishes a TCP connection with the destination SMTP.



30. _________ is limited to 7-bit ASCII text, with a maximum line length of 1000 characters.



 

which of the following OSI layer is

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