Watch the labs, then run them.
18 full-length Cisco Packet Tracer walkthroughs — no music, no fluff, just the CLI and the topology. Every lab you can watch here you can also open and break yourself on the free labs page.
Subnetting & IP fundamentals
Binary, decimal, subnetting, VLSM — the arithmetic every CCNA question rests on.
Decimal to Binary Conversion — CCNA 200-301 | Subnetting Prep Method
Subnetting — CCNA 200-301 | IP Classes, Binary, Public vs Private, First Subnets
VLSM Explained — Variable Length Subnet Masking | CCNA 200-301 | Packet Tracer Lab
Switching, VLANs & Layer-2 security
VLANs, trunks, inter-VLAN routing, port security, DHCP snooping, DAI.
VLANs and Trunking Full Lab — CCNA 200-301 | Packet Tracer Walkthrough
Inter-VLAN Routing Explained, Router on a Stick Lab | CCNA 200-301 | Packet Tracer
DHCP Snooping + Dynamic ARP Inspection Lab — CCNA 200-301 | Cisco Packet Tracer
Routing & OSPF
Single-area, multi-area, adjacency troubleshooting, and CCNP redistribution.
OSPF Configuration Lab — CCNA 200-301 | Cisco Packet Tracer Full Walkthrough
OSPF Adjacency Down Troubleshooting Walkthrough | CCNA Lab Practice
Multi-Area OSPF & LSA Types Masterclass | CCNA 200-301 Full Lab Walkthrough
IP services (DHCP, NAT)
Address handout and translation — the plumbing behind every real network.
DHCP Configuration Lab | CCNA 200-301 | Cisco Packet Tracer Full Walkthrough
ACLs & filtering
Standard, extended, and the "why is my ACL not matching?" fix-it lab.
Standard ACL Lab — CCNA 200-301 | Cisco Packet Tracer Full Walkthrough
Extended ACL Lab — CCNA 200-301 | Source + Destination + Port Filtering
ACL Not Working? How to Fix Failing Rules & Modify Cisco ACLs | CCNA 200-301
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