Subnet Mask Explained | Network vs Host Portions | Day-8 #cybersecurity #networking #ccna #hacker

Day 8 of Networking Fundamentals for Cybersecurity. A subnet mask tells your devices which part of an IPv4 address is the network and which part is the host. In this episode we break it down clearly so you finally understand: • What a subnet mask actually does • Network portion vs Host portion • Why 255.255.255.0 is written as /24 • How devices know if traffic stays local or needs a router • Why subnet masks matter for cybersecurity & network segmentation Perfect for beginners who want to build a strong foundation before learning subnetting. ⏱️ Timestamps: 00:00 – Hook: Network or Host? 00:45 – What is a Subnet Mask? 01:40 – Simple Example (192.168.1.10 + 255.255.255.0) 02:50 – Why We Need Subnet Masks 03:40 – 255.255.255.0 in Binary & /24 04:50 – Multiple Devices on the Same Network 05:50 – Network Address vs Hosts vs Broadcast 07:00 – How Subnet Masks Affect Routing 08:00 – Cybersecurity Connection (Segmentation) 09:20 – Important Distinction (Subnetting ≠ Security) 10:20 – Real-World Example 11:20 – Recap 12:00 – Next Episode Teaser Next episode → Day 9: Subnetting – Dividing a Network Series Path: Networking → Systems → Cybersecurity → Ethical Hacking & Defense Follow RootX for the full series. #SubnetMask #Networking #Cybersecurity #IPv4 #CIDR #NetworkSecurity #EthicalHacking #RootX