Subnets.txt

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1. What is the subnet mask for a /25 network segment?
255.255.255.128
2. What is the Class A Private IP range?
10.0.0.0 – 10.255.255.255

or

10.0.0.0/8 (255.0.0.0)
3. What is the Class B Private IP range?
172.16.0.0 – 172.31.255.255

or

172.16.0.0/12 (255.240.0.0)
4. What is the Class C Private IP range?
192.168.0.0 – 192.168.255.255

or

192.168.0.0/16 (255.255.0.0)
5. Name the power of 2's range 1-4
• 1- 2
• 2- 4
• 3- 8
• 4- 16
6. Name the power of 2's range 5-8
• 5- 32
• 6- 64
• 7- 128
• 8- 256
7. Name the power of 2's range 9-12
• 9- 512
• 10- 1024
• 11- 2048
• 12- 4096
8. Name Class A First Octet Values

Total Networks
1 - 126

126
9. Name Class B First Octet Values

Total Networks
128 - 191

16,384
10. Name Class C First Octet Values

Total Networks
192 - 223

2,097,152
11. Name Class D First Octet Values (Multi-Cast)
224 - 239
12. What are the rules for writing Subnets as
32bit binary numbers?
The value must not interleave 1s and 0s

If 1s exist, they are on the left

If 0s exist, they are on the right
13. What are the two parts of a subnet mask?
Prefix and Host
14. What are the 3 parts of a classful IP subnet?
How are the written in Binary?
• Network Subnet Host
• 1111... 1111... 0000.....
15. List some functions of a Subnet Mask
Defines the size of the Prefix

Defines the size of the host part of the addresses in the subnet

Can be used to calculate the number of hosts in the subnet

Provides a means for the network designer to communicate the design details to the devices in the network

Under certain circumstances can be used to calculate the number of Subnets in the entire network.

Can be used in binary calculations of both the subnet ID and the subnet mask
16. What is the concept of Classless addressing?
The concept that an IPv4 address has two parts- the prefix part plus the host part as defined by the mask with no consideration of the class.
17. What is the concept of Classfull addressing?
The concept that an IPv4 address has three parts- network, subnet, and host as defined by the mask and the class.
18. What is the decimal equivalant of this octet:

.1000000.
128

19. What is the decimal equivalant of this octet:

11000000
192

20. What is the decimal equivalant of this octet:

11100000
224

21. What is the decimal equivalant of this octet:

.11110000.
240

22. What is the decimal equivalant of this octet:

.11111000.
248

23. What is the decimal equivalant of this octet:

.11111100.
252

24. What is the decimal equivalant of this octet:

.11111110.
254

25. What is the decimal equivalant of this octet:

.11111111.
255