Azure Classroom Series – 21/Aug/2021

Exercise

  • Exercise: Create a private network with 3 subnets

    • Each subnet requires 25000 devices to be connected
  • Total devices

2^n ~= 70000
host id bits = 17

network id bits = 15
  • We have 3 private cidr ranges
192.168.0.0/16 => min size for network id = 16 max size for host id = 16
    => we cannot use this range
172.16.0.0/12 => min size for network id = 12 max size for host id = 20
10.0.0.0/8 => max size for host id =>24
  • Lets choose 172.16.0.0
network => 172.16.0.0/15

IP: 10101100.00010000.00000000.00000000
SM: 11111111.11111110.00000000.00000000

IP: 10101100.0001000x.xxxxxxxx.xxxxxxxx

Each subnet has 25000 devices 
2^n ~= 25000 n = 15

NETWORK IP: 10101100.0001000x.xxxxxxxx.xxxxxxxx
SUBNET  IP: 10101100.0001000x.xyyyyyyy.yyyyyyyy

Possibilities:

SUBNET1 : 10101100.00010000.0yyyyyyy.yyyyyyyy => 172.16.0.0/17
SUBNET2 : 10101100.00010000.1yyyyyyy.yyyyyyyy => 172.16.128.0/17
SUBNET3 : 10101100.00010001.0yyyyyyy.yyyyyyyy => 172.17.0.0/17
  • Exercise:
    • We need a network with 8 subnets and each subnet requires 500 devices.
    10.10.0.0/20
    
    subnet1: 10.10.0.0/23
    subnet2: 10.10.2.0/23
    subnet3: 10.10.4.0/23
    subnet4: 10.10.6.0/23
    subnet5: 10.10.8.0/23
    subnet6: 10.10.10.0/23
    subnet7: 10.10.12.0/23
    subnet8: 10.10.14.0/23
    

Networking Basics

  • Devices with in a network can communicate with each other i.e. Devices with Same network id can communicate with each other directly Preview
  • If we need to communicate b/w two devices in different network they will not be able to communicate directly
  • For the communication to happen i.e. for packets to travel from one network to other network we need a router Preview
  • Traceroute (tracert (Windows) traceroute (linux)) will show the hops to reach to the desired device Preview

First Network in Azure

  • In Azure we create resources and the network which we are trying to create is also a resource.
  • Every resource in Azure has to belong to some resource group.
  • Generally for almost all the resources we need to specify the region

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