MultiCloud Classroom notes 23/Feb/2024

Expanding CIDR Ranges

• 10.10.0.0/15

ip:       10.0000101x.xxxxxxxx.xxxxxxxx
min: 10.10.0.0
max:      10.00001011.11111111.11111111 => 10.11.255.255
SM: 11111111.11111110.00000000.00000000

Subnetting

• Dividing a network into multiple smaller networks
• Lets create two subnets from a network 192.168.0.0/24 of 250 devices, each subnet needs a network to connect approximately 100 devices
  
• solution

Network CIDR: 192.168.0.0/24

Network SM: 11111111.11111111.11111111.00000000

# subnet requrires 100
2^n ~= 100
n = 7
N = 32 - 7 = 25

Network SM: 11111111.11111111.11111111.00000000
Subnet SM:  11111111.11111111.11111111.10000000
    ------------------------------------------------
                                      .x
                             192.168.0.x0000000
                             192.168.0.00000000 = 192.168.0.0/25
                             192.168.0.10000000 = 192.168.0.128/25

* private cidr ranges

192.168.0.0/16
10.0.0.0/8
172.16.0.0/12

• We are asked to create a network to host 1000 devices. This requires 4 subnets of approximately 200 devices

Network:

2^n ~= 1000
n = 10
N = 22

Network: 172.16.0.0/22
Network SM: 11111111.11111111.11111100.00000000

Subnet: 

2^n ~= 200
n = 8
N = 24
Network SM: 11111111.11111111.11111100.00000000
Subnet SM:  11111111.11111111.11111111.00000000
----------------------------------------------------
                                    xx
                       172.16.00000000         => 172.16.0.0/24
                       172.16.00000001         => 172.16.1.0/24
                       172.16.00000010         => 172.16.2.0/24
                       172.16.00000011         => 172.16.3.0/24

• We are asked to create 4 subnets in a network. Each subnet needs approximately 2000 devices

Network:

2^n ~= 8000
n = 13
N = 19

network: 192.168.0.0/19

Subnet:

2^n ~= 2000
n = 11
N = 21
Network SM: 11111111.11111111.11100000.00000000
Subnet SM:  11111111.11111111.11111000.000000000
          ---------------------------------------
                      192.168.000xx000.
                      192.168.00000000.            = 192.168.0.0/21
                      192.168.00001000.            = 192.168.8.0/21
                      192.168.00010000.            = 192.168.16.0/21
                      192.168.00011000.            = 192.168.24.0/21


Network: 192.168.0.0/19
subnet 1: 192.168.0.0/21
subnet 2: 192.168.8.0/21
subnet 3: 192.168.16.0/21
subnet 4: 192.168.24.0/21


network: 10.10.128.0/19

Network SM: 11111111.11111111.11100000.00000000
Subnet SM:  11111111.11111111.11111000.000000000
          -----------------------------------------
                        10.10.100xx000
                        10.10.10000000 = 10.10.128.0/21
                        10.10.10001000 = 10.10.136.0/21
                        10.10.10010000 = 10.10.144.0/21
                        10.10.10011000 = 10.10.152.0/21 

• I want to create 4 subnet of size 100 each

Network:
2^n ~= 400
n = 9
N = 23
network: 192.168.0.0/23

Subnet:
2^n ~ =  100
n = 7
N = 25

Network SM: 11111111.11111111.11111110.00000000
Subnet SM : 11111111.11111111.11111111.10000000
            -------------------------------------
                      192.168.0000000x.x0000000
                      192.168.00000000.00000000  = 192.168.0.0/25
                      192.168.00000000.10000000  = 192.168.0.128/25
                      192.168.00000001.00000000  = 192.168.1.0/25
                      192.168.00000001.10000000  = 192.168.1.128/25