Layer2

• May 26, 2026 CCNA: Ethernet and Switching Fundamentals

  A comprehensive deep-dive into Ethernet and Layer 2 switching — MAC address learning, the CAM table, flooding vs forwarding, broadcast domains, duplex and autonegotiation, Cisco IOS switching commands, and how a frame actually traverses a switched network.

• May 26, 2026 CCNA: Spanning Tree Protocol — STP, RSTP, and Why Layer 2 Loops Are Catastrophic

  A complete guide to Spanning Tree Protocol for CCNA candidates and working engineers: why STP exists, the bridge election process, port states, RSTP improvements, PortFast, BPDU Guard, and full Cisco IOS configuration with annotated CLI output.