BLOG THREE - SUBNETTING HOMEWORK

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A company has a 190.240.0.0/16 block. They now want to re-organise it into large blocks. They wish to have subnets that can handle at least 1000 hosts each. 

Also, please calculate the following for the second subnet:

·         Subnet mask

·         Subnet address

·         First usable address in that subnet

·         Last usable address in that subnet

·         Broadcast address of that subnet

 

 

190.240.0.0 / 16

190 : 240 : SSSSSSHH : HHHHHHHH

2S = 64 Subnets  ::  256 / 64 = 4

4 Subnet Range
E.g., 0, 4, 8, 12, 16 etc

2H = 1024  ::  Usable 1024 – 2

Number of usable hosts per subnet

CIDR:

22
E.g., (8(190) + 8(240) + 6(SSSSSS))

Number of Subnets:

64

Usable Hosts Per Subnet:

1022

11111111 . 11111111 . 11111100 . 00000000

Subnet Mask:

255.255.252.0

Second Subnet:

190.240.4.0

Second Subnet
First Usable Addresses:
Last Usable Address:


190.240.4.1
190.240.7.254

Broadcast Addresses:

190.240.7.255


 

NMIT has an Internet address of 202.49.18.0 /24. TALOS has been given a 202.49.18.0/26 subnet.

·         What is the subnet addresses of each of the /26 subnets that NMIT can give out?

·         How many external IP addresses (the maximum in its subnet) could TALOS use on its firewall?

 

 

202.49.18.0 / 24

202 : 49 : 18 : SSHHHHHH

2S = 4 Subnets  ::  256 / 4 = 64

4 Subnet Range
E.g., 0, 64, 128, 192

2H = 64  ::  Usable 64 – 2 = 62

Number of usable hosts per subnet

CIDR:

26
E.g., (8(202) + 8(49) + 8(18) + 2(SS))

Number of Subnets:

4

Usable Hosts Per Subnet:

62

11111111 . 11111111 . 11111111 . 11000000

Subnet Mask:

255.255.255.192

First Subnet:

202.49.18.0

First Usable Addresses:
Last Usable Address:

202.49.18.1
202.49.18.62

Broadcast Addresses:

202.49.18.63

Second Subnet:

202.49.18.64

First Usable Addresses:
Last Usable Address:

202.49.18.65
202.49.18.126

Broadcast Addresses:

202.49.18.127

Third Subnet:

202.49.18.128

First Usable Addresses:
Last Usable Address:

202.49.18.129
202.49.18.190

Broadcast Addresses:

202.49.18.191

Fourth Subnet:

202.49.18.192

First Usable Addresses:
Last Usable Address:

202.49.18.193
202.49.18.254

Broadcast Addresses:

202.49.18.255

 

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