chapter 7

1.what is the internet
The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic and optical networking technologies.
source:http://en.wikipedia.org/wiki/Main_Page
2.what is internet protocol?(ip adress)
The Internet Protocol (IP) is a protocol used for communicating data across a packet-switched internetwork using the Internet Protocol Suite, also referred to as TCP/IP
.source:en.wikipedia.org/wiki/Internet_Protocol
3 what is OSI model?

is a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a way of sub-dividing a communications system into smaller parts called layers. A layer is a collection of conceptually similar functions that provide services to the layer above it and receives services from the layer below it. On each layer an instance provides services to the instances at the layer above and requests service from the layer below
source:http://en.wikipedia.org/wiki/OSI_model
4-what is internet infrastructure
is a collective term for all hardware and software systems that constitute essential components in the operation of the Internet.
Physical transmission lines of all types, such as wired, fiber optic and microwave links, along with routing equipment, the accompanying critical software services like the Domain Name System (DNS), Email, website hosting, authentication and authorization, storage systems, and database servers are considered critical Internet components^[1][2]. If any of these systems and services were to be interrupted for a significant period of time "[t]he Internet...as we know it would collapse
source:http://en.wikipedia.org/wiki/Critical_Internet_infrastructure
5-what is domaine names
A domain name is an identification label that defines a realm of administrative autonomy, authority, or control on the Internet, based on the Domain Name System (DNS)
source:http://en.wikipedia.org/wiki/Domain_names
6-what is world wide web? and its services
A-World Wide Web, WWW, web (computer network consisting of a collection of internet sites that offer text and graphics and sound and animation resources through the hypertext transfer protocol) source:
http://wordnetweb.princeton.edu/perl/webwn?s=world%20wide%20web
B-