Networking Contd

• Exercise: Lets create a network of 400000 (4 lakh devices) with 16 subnets of approximately 25000 devices.

Network: 
2^n ~= 4 lakhs
n = 19
N = 32-19 = 13

cidr network: 172.16.0.0/13
Network SM:   11111111.11111000.00000000.00000000

Subnet Size ~= 25000
2^n ~= 25000
n = 15
N = 32-15 = 17

Network SM: 11111111.11111000.00000000.00000000
Subnet  SM: 11111111.11111111.10000000.00000000
------------------------------------------------
                 172.00010xxx.x0000000.0/17
                 172.00010000.00000000.0/17 => 172.16.0.0/17
                 172.00010000.10000000.0/17 => 172.16.128.0/17
                 172.00010001.00000000.0/17 => 172.17.0.0/17
                 172.00010001.10000000.0/17 => 172.17.128.0/17
                                            => 172.18.0.0/17
                                            => 172.18.128.0/17
                                            => 172.19.0.0/17
                                            => 172.19.128.0/17
                                            => 172.20.0.0/17
                                            => 172.20.128.0/17
                                            => 172.21.0.0/17
                                            => 172.21.128.0/17
                                            => 172.22.0.0/17
                                            => 172.22.128.0/17
                                            => 172.23.0.0/17
                                            => 172.23.128.0/17

DHCP and DNS

• To allocate an IP to the device that is connected to network, we have two options
  • static
  • dynamic
• To assign ip addresses of your cidr rnage to a device connected to a network DHCP Server is used.
• DNS Server maintains records, most popular being
  • Domain Name to ip
  • Alias to Domain

Azure Global Infrastructure

• Azure infrastructure is logically seperated as
  • Regions:
    • Region with zones
    • Region without zones
• All the regions in Azure are connected using Azure Backbone Network.