3 Easy Steps Subnetting

By David Rupu Xiao CCIE #24177


Simple, easy, fast way of the CCNA subnet training

 3 Easy Steps Subnetting
Question:

If PC1’s ip address is : 10.1.1.149/30 or 10.1.1.149 255.255.255.252

what could be PC2’s ip address?

Answer:

Step 1: What is the SIZE of each subnet ?

we have 2 bits for host parts, so the SIZE of each subnet is 4

Step 2: List all the subnets, the SIZE of each subnet is 4

subnet: 10.1.1.0 ~ 10.1.1.3

subnet: 10.1.1.4 ~ 10.1.1.7

subnet: 10.1.1.8 ~ 10.1.1.11

subnet: 10.1.1.12 ~ 10.1.1.15

subnet: 10.1.1.140 ~ 10.1.1.143

subnet: 10.1.1.144 ~ 10.1.1.147

subnet: 10.1.1.148 ~ 10.1.1.151 ( PC1 10.1.1.149 is here )

subnet: 10.1.1.152 ~ 10.1.1.155

Step 3: Get PC2’s address

We must put PC2 in the same subnet as PC1

Three IPs we can not use for PC2:

We can not use 10.1.1.148, which is the first ip –> the Network ID

We can not use 10.1.1.149, which is used by PC1

We can not use 10.1.1.151, which is the last ip –> the Broadcast address

Any other ip in the range 10.1.1.148 ~ 10.1.1.151 is good for PC2

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Question:

If PC1’s ip address is : 10.1.1.149/29 or 10.1.1.149 255.255.255.248

what could be PC2’s ip address ?

Step 1: size is 23 = 8

Step 2: subnets list

10.1.1.0 ~ 10.1.1.7

10.1.1.8 ~ 10.1.1.15

10.1.1.148 ~ 10.1.1.155 10.1.1.149 falls in this range !

10.1.1.156 ~ 10.1.1.163

Step 3:

PC2 ‘s IP could be any of: 10.1.1.150 ~ 10.1.1.154

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Question:

If PC1’s ip address is : 10.1.1.149/28 or 10.1.1.149 255.255.255.240

what could be PC2’s ip address ?

Step 1: size is 24 = 16

Step 2: subnets list

10.1.1.0 ~ 10.1.1.15

10.1.1.16 ~ 10.1.1.31

10.1.1.128 ~ 10.1.1.143

10.1.1.144 ~ 10.1.1.159 10.1.1.149 falls in this range !

Step 3:

PC2 ‘s IP could be any of: 10.1.1.145 ~ 10.1.1.158 except 10.1.1.149

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Question:

If PC1’s ip address is : 10.1.1.149/27 or 10.1.1.149 255.255.255.224

what could be PC2’s ip address ?

Step 1: size is 25 = 32

Step 2: subnets list

10.1.1.128 ~ 10.1.1.159 10.1.1.149 falls in this range !

Step 3:

PC2 ‘s IP could be any of: 10.1.1.129 ~ 10.1.1.158 except 10.1.1.149

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Question:

If PC1’s ip address is : 10.1.1.149/26 or 10.1.1.149 255.255.255.192

what could be PC2’s ip address ?

Step 1: size is 26= 64

Step 2: subnets list

10.1.1.128 ~ 10.1.1.191 10.1.1.149 falls in this range !

Step 3:

PC2 ‘s IP could be any of: 10.1.1.129 ~ 10.1.1.190 except 10.1.1.149

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Question:

If PC1’s ip address is : 10.1.1.149/25 or 10.1.1.149 255.255.255.128

what could be PC2’s ip address ?

Step 1: size is 27= 128

Step 2: subnets list

10.1.1.128 ~ 10.1.1.255 10.1.1.149 falls in this range !

Step 3:

PC2 ‘s IP could be any of: 10.1.1.129 ~ 10.1.1.254 except 10.1.1.149

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Question:

If PC1’s ip address is : 10.1.1.149/24 or 10.1.1.149 255.255.255.0

what could be PC2’s ip address ?

PC2 ‘s IP could be any of: 10.1.1.1 ~ 10.1.1.254 except 10.1.1.149

Given ip address: 149.149.149.149/23

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.254.0 Ip address Range: 149.149.148.0 ~ 149.149.149.255

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Given ip address: 149.149.149.149/22

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.252.0 Ip address Range: 149.149.148.0 ~ 149.149.151.255

—————————————–

Given ip address: 149.149.149.149/21

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.248.0 Ip address Range: 149.149.144.0 ~ 149.149.151.255

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Given ip address: 149.149.149.149/20

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.240.0 Ip address Range: 149.149.144.0 ~ 149.149.159.255

—————————————–

Given ip address: 149.149.149.149/19

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.224.0 Ip address Range: 149.149.128.0 ~ 149.149.159.255

—————————————–

Given ip address: 149.149.149.149/18

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.192.0 Ip address Range: 149.149.128.0 ~ 149.149.191.255

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Given ip address: 149.149.149.149/17

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.128.0 Ip address Range: 149.149.128.0 ~ 149.149.255.255

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Given ip address: 149.149.149.149/16

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.255.0.0 Ip address Range: 149.149.0.0 ~ 149.149.255.255

—————————————–

Given ip address: 149.149.149.149/15

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.254.0.0 Ip address Range: 149.148.0.0 ~ 149.149.255.255

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Given ip address: 149.149.149.149/9

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 255.128.0.0 Ip address Range: 149.128.0.0 ~ 149.255.255.255

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Given ip address: 149.149.149.149/2

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 192.0.0.0 Ip address Range: 128.0.0.0 ~ 191.255.255.255

—————————————–

Given ip address: 149.149.149.149/1

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 128.0.0.0 Ip address Range: 128.0.0.0 ~ 255.255.255.255

—————————————–

Given ip address: 149.149.149.149/0

What is the subnet mask ?

What is the ip address range for this subnet ?

Answer: subnet mask: 0.0.0.0 Ip address Range: 0.0.0.0 ~ 255.255.255.255

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