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Consider the following application layer services: (a) Domain names to IP Address mapping (b) Data Communication over World Wide Web (c) Electronic mail transmission  (d) Retrieve e-mail from a remote server (e) Transfer files from one host to another host Which one of the following order of application layer protocols is correct for the above services?

Consider the following application layer services: (a) Domain names to IP Address mapping (b) Data Communication over World Wide Web (c) Electronic mail transmission  (d) Retrieve e-mail from a remote server (e) Transfer files from one host to another host Which one of the following order of application layer protocols is correct for the above services? Correct Answer DNS, HTTP, SMTP, POP, FTP

The correct answer is option 3.

Concept:

a) Domain names to IP Address mapping:

The Domain Name System (DNS) converts hostnames to IP addresses so that they can be used in a network.  DNS provides host name-to-IP address mapping via domain name servers, which are network server hosts.

b) Data Communication over World Wide Web:

Hypertext Transfer Protocol (HTTP) is the protocol that enables communication online, transferring data from one machine to another. This data communication happens over the World Wide Web.

c) Electronic mail transmission:

Simple mail transfer protocol (SMTP) is the protocol for transferring electronic mail. SMTP has a dedicated well-known port number 25.

d) Retrieve e-mail from a remote server

Post Office Protocol (POP) is used for email retrieval purposes and starts by accessing email from a remote server.

e) Transfer files from one host to another host

File Transfer Protocol (FTP) is a file transmission protocol that allows users to transfer files between one host to another host server or computer.

Hence the correct answer is DNS, HTTP, SMTP, POP, FTP.

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