Lesson

Binary data is base 2 as in 1's or 0's

a bit is 1 number, 4 bits are a nibble and 8 bits are a byte

Kilobyte=1024 bytes because it is 2^10

          128,64,32,16,8,4,2,1

132=      10000100

96=        01100000

10=        00001010

254=      11111110

67 =       01000011

102=      01100110

59 =       00111011

            128,64,32,16,8,4,2,1

00101111 = 47

01111110 = 126

11111111 = 255

11011101 = 29+192 = 223

11001000 = 8 + 192 = 200

           8,4,2,1

0101+         1010+       0010+   1100+       1110+

0110            0100        0011      0001         0010

_____           ____         _____     ____          ____

1011 = 11   1110=14   0101=5 1101=13  10000=16 (stack overflow)

1                                     1                          111

128,64,32,16,8,4,2,1

10000000+            00111110+         011000010+

00100000              00110010           000000100

_________              _________          ___________

10100000    =160  01110000=112  011000110=102

                                 11111          

8,4,2,1  012346789ABCDEF

01101010 =   6A

11111110 =    FE

00100000 =   20

00100010 =    22

A1= 161

DF= 208+15= 223

79= 112+9=121

33= 51

C4= 196

7B=123

Gigabyte=1024^2 kilobytes

Petabyte=8*1024^5

Yotta=8*1024^6

6). What is base 10 base 2 and base 16? Denary, binary, hexadecimal

7). Hexadecimal is used to convert binary because each character represents a nibble

8). Write a simple Python program that works out bits/bytes or converts binary to denary or hexadecimal

 

Domain name system

The DNS server would convert the domain name into the IP adresses that your computer uses to transfer data on the website so you can use it. The domain name may seem unnecessary because it is just the IP adress that is needed but it means that people who use the sight regularly can remember the domain name and access the site more easily. It also means that search engines can find the sites related to what you want to find because IP adresses don't give any information about the sight.

However, the domain name system has some problems, it means that the Internet is centralised around the DNS servers so if the DNS breaks down like it almost did a few years ago then the whole internet could crash.

As a company controls it, it can be controlled by the laws of the countries it is based in so could mean that not everyone can share information online which was what the Internet was made for.

Powtoons

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