2. It is a computer-based worldwide information network.
It is composed of a large number of smaller
interconnected networks and international computer
network linking together thousands of individual networks
at military and government agencies, educational
institutions, nonprofit organizations, industrial and
financial corporation’s of all sizes, and commercial
enterprises (called gateways or service providers) that
enable individuals to access the network. The most
popular features of the Internet include electronic mail (e-
mail), discussion groups (called newsgroups or bulletin
boards, where users can post messages and look for
responses on a system called Usenet), on-line
conversations (called busy), adventure and role-playing
games, information retrieval, and electronic commerce (e-
commerce).
3. Importance of the Internet
Information
Communication
◦ Effective communications with people around the
world
◦ Inexpensive communication
4. Client – user, subscriber = Information
Receiver
Server – provider = information provider
5. Downloading – The process of retrieving files
from a remote server to users terminal.
Hypertext – Interlinked system of documents
Hyperlink – Portions of the hypertext
documents that are linked to other related
documents.
6. Dedicated access – the computer is directly
connected to the internet via router using
cable, as a router.
Dial-up access – a computer connects to the
internet with a temporary connection.
7. Packet – small units of information.
Modem – a device that converts the electronic
signals from a computer into signal that can be
transmitted via telephone lines.
TCP/IP – Transmission Control Protocol/ Internet
Protocol
Internet Protocol (IP Address) – is a numerical
value assigned to each computer and printer,
participating in a computer network that uses the
internet protocol for communication.
Network Address – is a variable for a node or
network interface of a telecommunications
network.
URL – Uniform Resource Locator
Bandwidth – the amount of data that a computer
network can transmit
8. Network – is the techniques, physical connections
and computer programs used to link two or more
computers.
3 Components of a Network
Application Software – consists of computer
programs that interface with network users and
permits sharing of information. EX. Windows,
DOS
Network Software – consists of computer
programs that establish protocols or rules, for
computers to talk one another. EX. UNIX.
Network Hardware – physically component that
connect computer. Ex. Modem, telephone lines,
NIC card, UTP cable.
