VLSM Explained — Variable Length Subnet Masking | CCNA 200-301 | Packet Tracer Lab

VLSM — Variable Length Subnet Masking — explained and applied in Cisco Packet Tracer. CCNA 200-301. Learn how to allocate different-sized subnets to different network segments to avoid wasting IP addresses. The efficient subnetting method used in real networks and tested directly on the CCNA exam.

⏱️ Timestamps:
00:00 What is VLSM and why it matters
00:20 Topology overview — New York and Toronto sites
01:30 Assigning the largest subnet first (VLSM rule)
03:53 Let's solve the second largest subnet
06:40 Working through all subnets step by step

Topology used:
192.168.1.0/24 — Toronto LAN A (45 hosts) · New York LAN B (29 hosts)
R1 and R2 connected via point-to-point link

VLSM design steps:
1. List all segments largest to smallest
2. Assign the first available block to the largest segment
3. Next available block to the next segment — no gaps
4. Point-to-point links always use /30 (2 usable hosts)

📌 Subnetting Part 1 (watch first) → https://youtu.be/L19uhrQMiE0
📌 Full CCNA playlist → https://www.youtube.com/playlist?list=PLHKWHbrWcT6gdgZrKIECIZx9dSKCuDlly

🔗 Free structured CCNA sessions → https://packetmentor.com

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