1. MAC Address Your Computers Drivers License By Christy Kushner
Hand out the worksheet of questions so the students can follow along.
MAC Address
Your Computers Drivers License
By Christy Kushner

2. Media Access Control AKA Hardware Address of Physical Address
Whiteboard: Ask the students why they have a SSN. Write their responses on the board. Circle the reasons that apply to a MAC address

3. 2 Parts to a MAC Address 38-D5-47 -A4-00-B8 38-D5-47 A4-00-B8
ID Number of the manufacture
A4-00-B8
Serial Number of the adapter
The first 3 bytes are the manufacture ID. The second 3 bytes are the serial number.
This is similar to the SSN up until 2007 when the first 3 digits of the SSN represented where you were born or filed for SSN.

4. Who is the Manufacturer?
MAC Address
Manufacturer
9C-8E E
CC:46:D6:7A:86:7B
00-0C-6E-14-DC-B3
28:5A:EB:DE:68:61
Hewlett Packard
Cisco Systems
ASUSTek COMPUTER INC.
Apple Inc.
Conduct a search using google or other search engine to find the manufacturer of the IP address.

5. Serial Number The serial number is assigned by the manufacture.
Each company may have a different system for assigning serial numbers.

6. Format of the MAC Address
Written with dash (-) or colon (:)
7E-B0-C2-C6-DE-C3
74:81:14:40:83:17
Note: Sometimes to save space the manufacturer will drop – or :

7. Is this a MAC Address
Question 1:
3C-B

8. 6C*19*8F*77*60*5E Is this a MAC Address Question 2:
The correct answer would have – instead of *

9. 08:CD-9B:14:DC-B3 Is this a MAC Address Question 3:
A MAC address either uses colon or a dash; not both.

10. Format of the MAC Address
Written with dash (-) or colon (:)
7E-B0-C2-C6-DE-C3
74:81:14:40:83:17
6 Groups (6 bytes, 48 bits) of 2 characters
7E = = 8 bits = 2 Nibbles = 1 byte

11. 456-D8-5601 Is this a MAC Address Question 4:
This is spaced similar to a SSN and does not contain 6 groups (bytes) of 2 characters.

12. Is this a MAC Address
Question 5:
A4:81:EE:78:F5:B0

13. 94~51~BF~F4~34 Is this a MAC Address Question 6:
This has a tilde separating the groups.

14. 2C:8A:72:D8:56:01:7E Is this a MAC Address Question 7:
Too many groups (bytes).

15. Is this a MAC Address
Question 8:
98:FF:D0:4C:A3:DD

16. Format of the MAC Address
Written with dash (-) or colon (:)
7E-B0-C2-C6-DE-C3
74:81:14:40:83:17
6 bytes (groups, 48 bits) of 2 characters
Characters consist of
Numbers 0-9
Letters A-F

17. Is this a MAC Address
Question 9:
1C:7B:21:3C:BC:59

18. DF:DG:0F:68:9A:97 Is this a MAC Address Question 10:
This contains the letter G. MAC addresses only use letters A-F.

19. C4-E0-32:8H-3F Is this a MAC Address Question 11:
This has multiple issues. Contains 5 bytes (groups), the letter H, and mixes dash and colon.

20. Is this a MAC Address
Question 12:
D4-5C-70-7A-86-7B

21. 38:E0:8E:1L:78:B9 Is this a MAC Address Question 13:
This has the letter L.

22. Base 10

23. Decimal or Base 10
10 Symbols used to describe numbers

24. Numbers 0 - 9
For most people using increments of 10 is easier to understand.
Count from 0 – 9.
The chart on the right shows the position to number comparison.
Position
Number 1 2 3 4 5 6 7 8 9 10

25. Base 10 Pattern of 10 repeats Based on the power of 10
Place Value: The number to the left is 10x greater
Larger numbers are built using smaller increments
10 1s = 10; 10 10s = 100; s = 1000

26. Calculating Base 10
Take 82 10 1 8 2 80 82
101 10 4 42 40 82

27. Base 10 Math Question 1: How many ways can you make 56? Ten One 5 6 416 3 26 2 36 1 46 56
You can think of this as blocks or money

28. Base 10 Math Question 1: How many ways can you make 132? 100s 10s 1s7 62 6 72 5 82 4 92 3
102 2
112 1
122
132
100s
10s 1s
100s
10s 1s 1 3 2 13 12 11 22 10 32 9 42 8 52

29.
Base 2 (Binary)
There are 10 types of people who in the world: those who understand binary and those who don’t.

30. Bit Bit stands for Binary Digit Binary digit has a value of 0 or 1
Based on the power of 2.
The smallest unit of data in a computer is a bit

31. bit
Binary Digit has 2 values On
Off 1

32. Binary Definitions 1 bit = 1 character 4 bit = 1 nibble
8 bits = 2 nibbles
2 nibbles = 1 byte
1 byte is written in 8 binary characters
2 bytes = word
4 bytes = double word
6 bytes = 48 bits

33. Conversions
Base 2 (Binary) and Base 10

34. Base 2 Everything is multiplied by 2
Only 1 digit is allowed in the empty box.
1 or 0 are the only allowed digits. 27 26 25 24 23 22 21 20
128 64 32 16 8 4 2 1

35. Converting Base 10 to Base 2
128 64 32 16 8 4 2 1
Take the Base 10 number “5”.
In Row 1, the numbers are multiplied by 2
Since 1 = On, it also means we are using it
Place 1 in the boxes that add up to 5
1 + 4 = 5, place a one in the 4 and 1 box
All other boxes receive a 0

36. Base 10 to Base 2 Exercise Exercise 1 Base 10 128 64 32 16 8 4 2 1 3 53 5
Base 10
128 64 32 16 8 4 2 1 3 5

37. Base 10 to Base 2 Exercise Exercise 2 Base 10 128 64 32 16 8 4 2 1 522
107
159
255
Base 10
128 64 32 16 8 4 2 1 5 22
107
159
255

38. Converting Base 2 to Base 10
128 64 32 16 8 4 2 1
Take the Base 2 byte
In the box above
Write the a bit in each box
Each number is written in sequential order
Add the base 10 numbers up
8 + 2 = 10

39. Base 2 to Base 10 Exercise Exercise 3 Base 2 128 64 32 16 8 4 2 1 2323
112
207
248
Base 2
128 64 32 16 8 4 2 1 23
112
207
248

40. Base 2 to Base 10 Exercise Exercise 3 Base 2 128 64 32 16 8 4 2 1 5050
100
200
255
Base 2
128 64 32 16 8 4 2 1 50
100
200
255

41. Base 16
Hexadecimal

42. Common uses for hexadecimal
MAC Addresses 00-1A-11- B5-7F-23
Uniquely identifies a device on the network
Color Codes FF-FF-FF
Representation of #s often in webpage languages HTML and CSS
Assembly Code
Tells the computer what to do
A computer can read this quickly
Memory Dumps
A list containing the items in the computers memory
Machine language is the binary version of assembly code
High level languages are programming languages such as python, C#, HTML and others
Assembly code is a low level programming language

43. Hexadecimal Based on the number 16 Hexa means 6 Decimal means 10
Add Hexa (6) + Decimal (10) = Hexadecimal (16)
Increase by a power of 16

44. Compare Base 2, 10,16
If you used 10 instead of A the computer may think you mean a 1 and a 0 instead of a 10.
Binary
Base 10
Base 16
0000
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
binary
Base 10
Base 16
1010 10 A
1011 11 B
1100 12 C
1101 13 D
1110 14 E
1111 15 F

45. Hex to Binary Each hexadecimal digit is 4 bits long
Take the letter D in hexadecimal
In base 10, D means 13
Convert 13 Binary
_ _ _ _ =
binary
Base 10
Base 16
1010 10 A
1011 11 B
1100 12 C
1101 13 D
1110 14 E
1111 15 F

46. Hex to Binary Exercise 1 Base 16 Base 10 Base 2 8 4 2 1 3 A 10 F 153 A 10 F 15
Base 16
Base 10
Base 2 8 4 2 1 3 A F

47. Hex Each hexadecimal digit is 4 bits long 2 nibbles is a byte
Also known as a nibble
2 nibbles is a byte
1 byte is 8 bits
1 byte contains 2 hex values
For numbers larger than 16 use multiple nibbles

48. Base 16 – 2 digits Exercise 2 Base 16 Separate Base 10 Base 2
Binary Representation 8 4 2 1 18 7A 7 A 10 9B 9 B 11
Base 16
Base 10
Base 2
Binary Representation 8 4 2 1 18 7A 7 A 9B 9 B

49. Base 16 Conversions Exercise 3 Base 16 Separate Base 10 Base 2
Binary Representation
Dotted Decimal 8 4 2 1 D4 20 BA
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1 D4 D 13
212 20 32 BA B 11
186 A 10 27 26 25 24 23 22 21 20
128 64 32 16 8 4 2 1

50. MAC Address Conversions
B4:99:BA:5D:87:F3
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1 B4 B 11
180 99 9
153 BA
186 A 10 5D 5 91 D 13 87
135 7 F3 F 15
243 3
Exercise 4

51. MAC Address Conversions
90:94:E4:3B:76:D4
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1 90 94 E4 3B 76 D4
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1 90 9
273 94
148 E4 E 14
228 3B 3 59 B 11 76 7
118 6 D4 D 13
180
Exercise 5

52. MAC Address Conversions
2C-AB E1-5F
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1 2C AB 00 77 E1 5F
Base 16
Separate
Base 10
Base 2
Binary Representation
Dotted Decimal 8 4 2 1 2C 44 C 12 AB A 10
171 B 11 00 77 7
119 E1 E 14
225 5F 5 95 F 15
Exercise 6