[darren0]

I find it a bit surprising that classful networks is not common knowledge. I guess it's just a sign that times have changed. This was a basic thing I learn when I first learned about subnets.

[detaro]

I find it a bit surprising in how many teaching materials you find it still, despite being outdated knowledge for a long time now :D

[Lammy]

> outdated knowledge

Personally I never totally 'got' CIDR until I went back and learned what it replaced and why it was needed.