Unit 4

Computer Systems and Networks

• 4.1 The Internet
• 4.1.1 Internet Basics
• 4.1.2 Internet Protocols
• 4.1.3 World Wide Web
• 4.2 Fault Tolerance
• 4.3 Parallel and Distributed Computing
• 4.3.1 Sequential Computing
• 4.3.2 Parallel Computing
• 4.3.3 Distributed Computing

Unit 4

• Computer systems and networks facilitate the transfer of data.

Essential Understanding 4

• The Internet is a network that most of you use on a regular basis to:
• look up information
• socialize with "friends"
• complete their school work
• Deep down, you are simply sending and receiving 0s and 1s.
• In this unit, we will learn how computer systems and networks, primarily the Internet, work.

Developing Understanding

• We will learn about how information is transmitted on the Internet and about the safeguards that have been put in place to keep this system from breaking down.
• In addition, we will learn the effect that dividing tasks across multiple computing devices can have on the speed at which processes can occur.

Developing Understanding

• Long, long ago, there were computers that were really big and worked really hard in isolation.

A Little History

Hidden Figures Computer

• Computers were huge and isolated, and research was being completed on how to get computers to communicate with one and other.

A Little History

• As time went on, we developed much smaller computers creating a growing need to become more connected.

A Little History

• We wanted computers to communicate so that data can flow freely through different devices.

Mobile Devices Need Connection

• A packet is a small amount of data sent over a network. Each packet includes the sources and the destination information.

Sending 1s and 0s

• A computer system is a group of computing devices and programs working together for a joint purpose.
• A computer network is a group of interconnected computing devices capable of sending or receiving data.
• How do we get computers to connect and communicate?

Key Terms and Ideas