what is Internet?
An international computer network providing e-mail and information from computers in various places such as schools, offices, government services, and etc.
what is Internet infrastructure?
All the hardware and services required to make this web page appear in your browser, or an RSS feed download into your reader, or VOIP calls / emails get to your desktop. All the underlying technologies that are unseen, but ‘make the Internet go’.
TCP/IP protocol (Transmission Control Protocol/Internet Protocol
is the basic communication language or protocol of the Internet. it can also be used in private network as a communications protocol. many Internet user are not really familiar with the term TCP/IP. however, they did not know that they often use the protocols that use TCP/IP to get to the Internet. the examples are FTP (File Transfer Protocol), TELNET which let you logon to remote computers and HTTP (Hyper Text Transfer Protocol)
every machines in the Internet have a very unique number that can be identify easily, which is called IP address. IP refers to Internet protocol, the system to communicate over the Internet. The four numbers in IP adress is called octets. the octets are there for a reason. it is used to differentiate classes in the IP address. IP address is used for two purposes which are network interface identification and location addressing.
there are a few terms that one must know about Internet. they are :
1) DNS (Domain Name System)
a hierarchical, distributed database that contains mappings of DNS domain names to various types of data, such as Internet Protocol (IP) addresses. DNS allows you to use friendly names, such as www.microsoft.com, to easily locate computers and other resources on a TCP/IP-based network. DNS is an Internet Engineering Task Force (IETF) standard.
2) IP address
every machine in a network has a unique identifier. it is also called an Internet address.