Intro to internet
- 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.