THE INFORMATIONSUPERHIGHWAY

CHAPTER 4SECTION 4

Computer Networks-a group of computers connected by cables or

telephone lines• 2 Types:– Local Area Network (LAN) - A set of

computers connected in one classroom or home–Wide Area Network (WAN) - computers

connected across larger distances

The Internet• A network of host computers that extends

around the world• Began in 1969 as a military communications

system• In 1993, businesses were allowed to sell

Internet connection. These businesses are known as Internet service providers (ISPs)

World Wide Web

• Developed in 1989• Allows people to display and view files, called

pages, on the Internet• Web pages can include text, pictures, video,

and/or sound• Software programs called search engines

allow people to search through the Web

Using Computers Safely• Protect Private Data– Share personal information only on networks that

require authorization and use security software to keep out unwanted users

– Use networks that encrypt information. Encryption is a process of coding information so only the intended user can read it.

Using Computers Safely

• Avoid Viruses–Computer viruses are programs

that interfere with the normal operation of a computer–It can destroy stored data or even

disable a computer

Using Computers Safely• Protect Personal Safety– Never give your name, address, or

telephone number– Chat rooms allow multiple users to

exchange messages simultaneously– However, users are not screened, so you

do not know who you’re chatting with

Using Computers Safely

• Respect Intellectual Property– Intellectual property can be an idea or creative

work, such as a book or musical performance– Governments protect intellectual property by

granting copyrights and patents– Violating copyrights or patents can result in fines

or other penalties

Online Safety

• https://www.youtube.com/watch?v=Cnc4LaevRBw• https://www.youtube.com/watch?v=9waE2A-uIxQ

Review

• What is a computer network?• What are the advantages of computer

networks?• What are three kinds of personal information

that might be shared on a computer network?• What is one way to protect personal

information when using a network?