Page 128 - Web Applications (803) Class 11
P. 128
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.
Do You Know?
• Internet bots and viruses account for 62% of all website traffic, or roughly two-thirds.
• Approximately 1.7 trillion euro dollars are spent on the internet.
• It takes approximately 2 billion electrons to create an email.
• Every year, online dating generates about $1 billion in revenue.
126 Touchpad Web Applications-XI

