Chapter 1: Binary Systems and Hexadecimal
What is the ASCII code for w?
%77
What is Hex digit A in denary?
10
What is the value of a full byte (11111111)?
255
How is Blue represented in Hex?
#0000FF
What is a MAC Address?
A number which uniquely identifies a device on the internet.
What are the 2 main components of HTML?
Structure (tags) and Presentation (.css files)
What is a Locally Administered Address?
The address changed to from UAA
What are Transistors?
Tiny switches that can either be on (1) or off (2)
How is Hex used in HTML?
To represent the colours of text
What is a Kilobyte?
2^10 bytes
What is a Megabyte?
2^20 bytes
What is a Gigabyte?
2^30 bytes
What is a Terabyte?
2^40 bytes
What is a Petabyte?
2^50 byte
What is a Nibble?
4 bits
What are the for 4 bases of 16 in descending order?
4096, 256, 16, 1
What is Denary or Decimal?
Base 10
What is Binary?
Base 2
What is a use of a register?
Control systems in the movement of a robotic device
What is a Network Interface Card (NIC)?
Each device that can access the internet has this which directly addresses the mac address
What is an Universally Administered Address?
Fixed, Set by manufacturer, most common
How do Web Addresses use HEX?
Hex digits are used to represent a web address or URL
What is Python and C# an example of?
High-level languages
What is an identity Number?
Identity number of the manufacturer of the device and the 1st half of the address (NN)
What are the Properties of a MAC Address?
Rarely changes, usually made of 48 bits but can have 64
What are the 3 colours used in HTML?
Red, Green, Blue
What are the 2 types of MAC Addresses?
UAA and LAA
What is an URL?
Uniform Resource Locator
What is a Memory dump?
When the contents of a computer's memory are outputted to a monitor or a printer
What are the advantages of using Hex in Assembly code?
coding is much faster, prone to less errors, takes up less memory space
What are 5 main uses of Hexadecimal?
Memory dumps, HTML, MAC Addresses, Web addresses, Assembly code and Machine code
What is the Format of a MAC Address?
NN:NN:NN:DD:DD:DD
What are the advantages of using Hex in a memory dump?
* Hex numbers can store larger values in very little digits. * More manageable * Easier debugging and fault-tracing
What are the disadvantages of using Hex in a memory dump?
* debugger requires considerable knowledge of computer architecture to interpret the results
What is Hexadecimal?
Base 16
What is A Register?
A group of bits that stores information
What is an ASCII?
American Standard Code for Information Interchange. Every character on the keyboard has an ASCII code.
What are Machine Code and Assembly code examples of?
Low-level languages
What is a Serial Number?
The serial number of the device and the 2nd half of the address (DD)
What is a Byte?
The smallest unit of memory storage in a computer
What are the disadvantages of using Hex in Assembly code?
only people who understand certain computer architecture could help fix errors, less universal