DQ revision

DQ revision

1. computational thinking

   • By one of the many definitions, computational thinking is the thought processes involved in formulating a problem and expressing its solution(s) in such a way that a computer—human or machine—can effectively carry out.

2. binary

   • The base-2 numeral system is a positional notation with a radix of 2. Each digit is referred to as a bit. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used by almost all modern computers and computer-based devices.

3. character sets

   • The base-2 numeral system is a positional notation with a radix of 2. Each digit is referred to as a bit. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used by almost all modern computers and computer-based devices.

4. secondary storage

   • Alternatively referred to as external memory, secondary memory, and auxiliary storage, a secondary storage device is a non-volatile device that holds data until it is deleted or overwritten. Secondary storage is about two orders of magnitude cheaper than primary storage

5. CPU

   • central processing unit

6. RAM

   • Random-access memory

7. Types of Networks: LAN, WAN, WLAN, MAN, SAN, PAN, EPN & VPN. There are so many different types of computer networks in existence, it can be hard to understand the differences between them, particularly the ones with very similar-sounding names.

8. network security

   • The network security key is the password or pass phrase that you use to authenticate with your home network. In order to establish a secure connection with your wireless router, you have to provide the key to prove that you are authorized to do so.

9. connection types

   • Analog: Dial-up Internet Access. Also called dial-up access, an analog Internet connection is both economical and slow. Using a modem connected to your PC, users connect to the Internet when the computer dials a phone number (which is provided by your ISP) and connects to the network