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Post Office Protocol (POP)

                 POP3 is a protocol for receiving emails. POP3, or Post Office Protocol 3, is the third iteration of a widely used email
                 delivery protocol that accepts and retains email for an individual until they pick it up. SMTP has the drawback of not
                 being able to receive mail if the destination machine is offline.
                 As a result, the SMTP server receives mail on behalf of each host, and each host then communicates with the SMTP
                 server to retrieve messages via the POP3 client-server protocol.

                 Telnet
                 Telnet is the most used internet protocol for connecting to a distant computer. It enables you to connect to remote
                 computers (also known as remote hosts) via a TCP/IP network (such as the Internet). Once your telnet client establishes
                 a connection to the distant host, it transforms into a virtual terminal, allowing you to communicate with the remote
                 host from your computer with whatever privileges you’ve been granted to that host’s specific program and data.

                 Internet Relay Chat

                 The IRC protocol is utilised for chatting. It allows you to talk with a group or two
                 people at the same time. It is built on the client/server architecture.

                 Ð ÐThe IRC client communicates with an IRC server by sending and receiving
                   messages.  The  message  is  sent  from  one  client  to  another  over  the  IRC
                   server.

                 Ð ÐThe IRC server is connected to a network of other IRC servers. Every user
                   on the IRC server is identified by a unique nickname. If numerous talks are
                   going on at the same time, each user is given their own channel.

                                             Voice over Internet Protocol (VoIP)

                                             It allows voice to be transferred over a packet-switched network instead of a public
                                             switched  telephone  network.  Phone  calls  can  be  made  utilising  a  normal  internet
                                             connection and VoIP software. Because the Telecommunication Company’s service is
                                             not used, this technique of making phone calls is far less expensive than the traditional
                                             method.  Today,  there  are  three  major  types  of  VoIP  services  in  use,  which  are
                                             as follows:

                 Analog-to-digital conversion (ATA)

                 It is used to link the computer to the telephone equipment. The phone’s analogue transmissions are converted to
                 digital signals via this device. These digital signals are capable of being sent via the internet. Some service providers
                 additionally include ATAs as part of their package.

                 IP Phones

                 IP phones have the appearance of a regular phone or a cordless phone. They are connected directly to the router or
                 LAN. They have all of the essential hardware and software onboard to handle the IP call. IP phones are also known as
                 VoIP phones, SIP phones, and soft phones.
                 Computer-to-Computer

                 It is the most easy and straightforward method of using VoIP. Computer, Internet, Speakers, and Microphone are the
                 most basic hardware requirements. The sole expense associated with computer-to-computer VoIP is the monthly
                 Internet service provider subscription.


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