IP classes

Question 1

Class A

Answer 1

first binary digits: 0

decimal range of first octet: 1-126

Question 2

Class B

Answer 2

first binary digits: 10

decimal range of first octet: 128-191

Question 3

Class C

Answer 3

first binary digits: 110

decimal range of first octet: 192-223

Question 4

Class D

Answer 4

first binary digits: 1110
decimal range of first octet: 224-239
used for multicasting

Question 5

Class E

Answer 5

first binary digits: 1111
decimal range of first octet: 240-255
reserved for future use

Question 6

Private IP Addresses

Answer 6

10. 0.0.0 - 10.255.255.255 (a full class A range)
11. 16.0.0 - 172.31.255.255 (16 class B ranges)
12. 168.0.0 - 192.168.255.255 (256 class C ranges)