Episode 51: CIDR Notation — Reading and Writing Network Ranges
This episode introduces Classless Inter-Domain Routing (CIDR) notation, the shorthand system used to represent IP address ranges with a suffix indicating the subnet mask. For example, 192.168.1.0/24 means the first 24 bits represent the network portion, leaving 8 bits for host addresses. CIDR is a core skill tested on the exam because it simplifies network representation and is the standard used in modern routing tables.
You will also learn how to interpret CIDR ranges quickly, calculate the number of hosts supported, and recognize how they relate to subnet masks. Practical examples include understanding why /30 subnets are used for point-to-point links and how /16 subnets can represent larger private networks. Troubleshooting scenarios highlight issues such as mismatched masks between devices or incorrectly summarized routes. By mastering CIDR, you’ll be able to read, write, and apply network ranges confidently in both exam and professional environments. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your certification path.
