Switch vs Router vs Firewall Explained | L2, L3, NGFW & IPS | CCNA 02

What is the difference between a switch, a router and a firewall? Follow three paths through a small office network: local printing, access to an internal server, and an external HTTPS connection. This CCNA lesson explains Layer 2 MAC learning, VLAN boundaries, Layer 3 switch routing with SVIs, the WAN router, ACL filtering and stateful firewall behavior. We also introduce NGFW capabilities, IPS versus passive IDS, access points and wireless controllers. You will see why a valid route does not guarantee permission, why an Internet-edge firewall does not inspect every internal flow, and why wireless client data does not always pass through the controller. The chosen architecture uses local wireless switching; central switching is shown as a separate comparison. Chapters : 00:00 Three boxes, three different questions 00:51 Meet the office network 01:55 The L2 switch learns where devices are 02:52 A VLAN boundary needs a routing decision 03:49 A Layer 3 switch really does route 04:50 Why keep an edge router? 05:53 A route is not permission 06:56 The firewall remembers a conversation 08:00 NGFW adds context beyond the port 09:13 IPS can stop traffic only on the right path 10:27 The AP connects wireless clients to the LAN 11:40 The controller coordinates, but paths depend on mode 12:56 Trace the path before blaming the box #CCNA #Networking #NetworkSecurity