While reviewing my old handwritten notes from my ISC² CC exam prep, I found a section where I had written out subnet ranges for Class C networks. It reminded me of late-night study sessions and the challenge of memorizing network and host address ranges.
I realized this was a good chance to refresh my memory and practice subnetting in a hands-on way. I decided to turn those notes into a full, structured report—a reference I could use for future labs, exercises, and real-world projects.
From Handwritten Notes to Subnet Reference
Focus: Class C subnets /25–/29
My report includes a complete table of subnet addresses, usable hosts, and broadcast addresses for the 192.168.1.0/24 network. The math follows standard formulas:
- Subnet increment = 2n
- Usable hosts per subnet = 2n – 2
- Note: n = number of host bits
Each subnet now has a network address, first and last usable hosts, and broadcast address—making it easy to reference when designing networks or completing exercises.
Handwritten Notes
I wanted to include my original ISC² CC exam prep notes. These images show how I manually calculated and wrote out the subnets.
Key Takeaways
- Reviewing old notes can spark useful exercises and refresh critical skills.
- Subnetting isn’t just memorization; structured practice helps reinforce understanding.
- Creating formal documentation from practice exercises builds knowledge and portfolio assets.