What is a Subnet Mask? | CompTIA Network+ N10-009-1.5
на канале: Yasir Ali OT
A subnet mask splits every IP address into two parts — the network and the host. Without understanding this, subnetting, routing, and IP design are impossible to grasp. In this video you'll learn how /24 notation works, how the bitwise AND operation decides where your traffic goes, and how to calculate usable hosts on any subnet.
📌 Chapters
00:00 — Intro: Why Subnet Masks Matter
00:18 — What a Subnet Mask Does (Overview)
00:55 — Network vs Host Portion
02:00 — CIDR Slash Notation (/24, /16, /8)
03:00 — The AND Operation — How It Works
04:00 — Hosts Per Subnet Formula
04:55 — Subnet Reference Table
05:25 — Real World: Home Router Example
05:55 — Summary & Key Takeaways
06:10 — What's Next
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