CIDR & Subnet Prefixes Explained | /24, /25, /26, /27 & /28 | Networking for Cybersecurity #11

What do /24, /25, /26, /27, and /28 actually mean? 🌐 In Day 11 of Networking Fundamentals for Cybersecurity, we break down CIDR (Classless Inter-Domain Routing) and subnet prefixes in a simple, beginner-friendly way. You'll learn: 🔹 What CIDR means 🔹 What a subnet prefix is 🔹 What /24 actually represents 🔹 How /25, /26, /27, and /28 work 🔹 How CIDR prefixes affect subnet size 🔹 How many addresses each prefix provides 🔹 Why larger prefixes create smaller subnets 🔹 How CIDR is used in real networks and Internet routing 🔹 Why CIDR matters in cybersecurity 📌 Quick Reference: /24 → 256 total addresses /25 → 128 total addresses /26 → 64 total addresses /27 → 32 total addresses /28 → 16 total addresses 🔐 Cybersecurity Connection: CIDR appears everywhere in cybersecurity — from firewall rules and network scanning to access-control policies, IP allowlists/blocklists, security monitoring, and incident response. Understanding CIDR helps you work with IP ranges instead of thinking about every IP address individually. 🎯 Learning Path: Networking → Systems → Cybersecurity → Ethical Hacking & Defense 📚 Series: Networking Fundamentals for Cybersecurity 📌 Day 11: CIDR & Subnet Prefixes — /24, /25, /26, /27 & /28 ▶️ Next: Day 12 — CIDR to Subnet Mask: How to Convert /24, /26, /27 & /28 Follow RootX and build your cybersecurity knowledge from the ground up. #Networking #Cybersecurity #CIDR #Subnetting #IPv4 #NetworkSecurity #CCNA #ComputerNetworking #NetworkingForCybersecurity #CybersecurityForBeginners #NetworkFundamentals #RootX