It’s not that kind of CIDR
Classless Inter-Domain Routing – CompTIA Network+ N10-006 – 1.8
When we switched from classful subnetting to CIDR, we created a new way to design and configure our networks. In this video, you’ll learn about classless inter-domain routing and how we were able to easily customize our subnet masks.
TCP/IP Subnets – CompTIA A+ 220-801: 2.3
Our TCP/IP networks are separated into many subnets. In this video, you’ll learn about the fundamentals of IP subnetting and how legacy class-based and modern classless subnetting is used to connect the worldwide Internet.
CompTIA Network+ N10-005: 1.3 – Classless Inter-Domain Routing
CIDR-block addressing has added new flexibility to IP subnetting. In this video, you’ll learn about classless inter-domain routing and the notation used to designate a CIDR-block address.