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Internet 1
 What is an Internet?

The Internet is a worldwide, publicly accessible series of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP). It is a "network of networks" that consists of millions of smaller domestic, academic, business, and government networks, which together carry various information and services, such as electronic mail, online chat, file transfer, and the interlinked web pages and other resources of the World Wide Web (WWW).

 What is its Terminology?

The Internet and the World Wide Web are not one and the same. The Internet is a collection of interconnected computer networks, linked by copper wires, fiber-optic cables, wireless connections, etc. In contrast, the Web is a collection of interconnected documents and other resources, linked by hyperlinks and URLs. The World Wide Web is one of the services accessible via the Internet, along with various others including e-mail, file sharing, online gaming and others described below. However, "the Internet" and "the Web" are commonly used interchangeably in non-technical settings.

 What is Internet Information Services?

Internet Information Services (IIS) 7.0 is a powerful Web server that provides a highly reliable, manageable, and scalable Web application infrastructure for all versions of Windows Server 2003. IIS helps organizations increase Web site and application availability while lowering system administration costs. IIS 7.0 supports the Microsoft Dynamic Systems Initiative (DSI) with automated health monitoring, process isolation, and improved management capabilities. Thinking of upgrading? Read this: Should I Upgrade to IIS 7.0?

 What is the Common uses of the Internet?
The Common uses of Internet is given below:-
[1] Email
[2] World Wide Web
[3] Remote Access
[4] Collaboration
[5] File Sharing
[6] Streaming Media
[7] Voice Telephony
 What is VoIP and How it Works?

VoIP (Voice over Internet Protocol) is simply the transmission of voice traffic over IP-based networks.
The Internet Protocol (IP) was originally designed for data networking. The success of IP in becoming a world standard for data networking has led to its adaptation to voice networking.

 Why VoIP is better ?

The number one reason to switch to VoIP technology for telephone service is cost reduction. VoIP has become popular largely because of the cost advantages to consumers over traditional telepone networks. VoIP slashes your monthly phone bill by a whopping fifty percent. Let's put some light over these claims.
It offers cheaper international long distance rates which are generally one-tenth of what is charged by traditional phone companies. Its portability makes it a very good option and one could avoid expensive hotel phone charges and cell phone roaming charges. What one requires is just a high speed connection where one could plug the adapter into and people could reach you at your local number irrespective of your location.

Most Internet connections are charged using a flat monthly fee structure. Using the Internet connection for both data traffic and voice calls can allow consumers to get rid of one monthly payment. In addition, VoIP plans do not charge a per-minute fee for long distance.

By making VoIP calls using internet enabled cell phones one could avoid wireless roaming fees and long distance rates which generally touch north. Most of the times in-network calls to other VoIP service subscribers are free even if the calling parties are located in different parts of the world.

 How does it work?

Just to confuse people, there are many kinds of VoIP. Using voice chat in MSN , G Talk or Yahoo messenger could be regarded as VoIP, so could the highly publicised Skype; but these are all proprietary systems. To talk to someone using MSN, the person at the other end also needs MSN. The same applies to Yahoo and, to a great extent, to Skype. They use their own special system that isn't open and won't connect to other systems easily.
True VoIP should really be based on the SIP system which is the recognized standard. Any SIP compatible device can talk to any other; you don't even use a PC. Any SIP telephone can call another right over the internet, you don't need any additional equipment or even a phone provider. Just plug your SIP phone into the internet connection, configure it and then dial the other person right over the internet.
In all VoIP systems, your voice is converted into packets of data, like little files, and then transmitted to the recipient over the internet and decoded back into your voice at the other end. To make it quicker, these packets are compressed before transmission, a bit like zipping a file.

 What is a Class D IP address?

Ip Address Ranges:
Class A: 0-126. : For about >256 Subnets and >16777214 hosts per subnet For Proper Configuraions of TCP/IP.
Class B: 128-191: for about >65536 Subnets and >65534 hosts per subnet
Class C: 192-223: For about >16777214 networks and 254 hosts per subnet
Class D: 224-239 : these addressess are for Scientific researches ..
Class E: 240-255. : these are kept for Future Use


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