Networking
Subnetting
- Divding a larger network into multiple smaller networks
References
- Private CIDR ranges
- 192.168.0.0/16
- 172.16.0.0/12
- 10.0.0.0/8
Problem statement 1
- I have to create two subnets for an organizational private network
- Workplace will have 250 device and servers will be 250
- Organizational network
total = 500
2^n - 2 ~= 500
n = 9
N = 32 - 9 = 23
network = 192.168.0.0/23
sip = 192.168.0.0
eip 192.168.00000001.11111111 = 192.168.1.255
SM = 11111111.11111111.11111110.00000000
- Subnet
size = 250
2^n - 2 ~= 250
n = 8
N = 24
N-SM: 11111111.11111111.11111110.00000000
S-SM: 11111111.11111111.11111111.00000000
-------------------------------
X.
S1: 192.168.00000000.00000000/24 = 192.168.0.0/24
S2: 192.168.00000001.00000000/24 = 192.168.1.0/24
Problem Statement 2
-
I have to create two subnets for an organizational private network
- Workplace has 1000 devices and we have 1000 servers
- Organization network size is 2000
2^n - 2 ~= 2000
n = 11
N = 32 - 11 = 21
ip: 10.200.0.0/21
SM: 11111111.11111111.11111000.00000000
- Subnet
2^n - 2 ~= 1000
n = 10
N = 22
N-SM: 11111111.11111111.11111000.00000000
S-SM 11111111.11111111.11111100.00000000
----------------------------------
X
S1-IP: 10.200.00000000.00000000/22 = 10.200.0.0/22
S2-IP: 10.200.00000100.00000000/22 = 10.200.4.0/22
Problem Statement 3
- Organization needs 4 subnets
- Each subnet needs 2000 ip addresses
- Organization size = 8000
2^n - 2 ~= 8000
n = 13
N = 32 -13 = 19
org-cidr = 172.16.0.0/19
SM: 11111111.11111111.11100000.00000000
- Subnet
2^n -2 ~= 2000
n = 11
N = 32 - 11 = 21
NSM: 11111111.11111111.11100000.00000000
SSM: 11111111.11111111.11111000.00000000
-----------------------------------------
XX
S1ip: 172.16.00000000.0/21 = 172.16.0.0/21
S2ip: 172.16.00001000.0/21 = 172.16.8.0/21
S3ip: 172.16.00010000.0/21 = 172.16.16.0/21
S4ip: 172.16.00011000.0/21 = 172.16.24.0/21
Problem statement 4
- Organization needs 4 subnets
- Each subnet needs 100 devices
- Organization size = 400
2^n - 2 ~= 400
n = 9
N = 32 - 9 = 23
ip: 192.168.0.0/23
NSM: 11111111.11111111.11111110.00000000
- Subnet:
2^n -2 ~ = 100
n = 7
N = 25
NSM: 11111111.11111111.11111110.00000000
SSM: 11111111.11111111.11111111.10000000
------------------------------------------
X.X
S1ip: 192.168.00000000.00000000 = 192.168.0.0/25
S2ip: 192.168.00000000.10000000 = 192.168.0.128/25
S3ip: 192.168.00000001.00000000 = 192.168.1.0/25
S4ip: 192.168.00000001.10000000 = 192.168.1.128/25
Relevance of subnets with application architectures
- Three tier architecture
- Highly available three tier architecture
