Subnetting Numerical || Network Part & Host Part of an IP address !!

In this video I have explained how to know network and host part of any class of IP address.
This video also contains different Numerical questions related to Subnetting like calculating:
1. Total number of subnets
2. Block size of subnets
3. valid subnets
4. Network ID/ address of each subnet
5. Broadcast ID/ address of each subnet
6. total number of hosts per subnet
7. total number of valid hosts per subnet

You can access the note in the video by the link below:
https://drive.google.com/drive/folders/1nTRYV506QYuz0_xreWV4W8d6WSFDn87j

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ip address