Check a Cisco switch warranty by grabbing the serial from the chassis or show inventory, then running it through the Cisco Serial Number Info Finder.
EtherChannel presents multiple physical links as a single logical interface to the spanning tree algorithm, eliminating blocked ports and enabling true line-rate redundancy.
Deep dive into VLAN naming conventions, the difference between standard and extended range VLANs, and best practices for VLAN management and deletion on Cisco Catalyst switches.
Master PVST (Per-VLAN Spanning Tree) on Cisco switches — learn configuration, root bridge design, port roles, and common troubleshooting tips.
An SVI stuck in up/down means something is wrong with the underlying VLAN — no active ports, a deleted VLAN, or STP blocking every path. Here is how to diagnose and fix every cause.
Explore the top CCNA network simulators I tested, hands-on insights, pros & cons, and tips to choose the right one for your study lab.
Learn to configure 802.1X port-based network access control on Cisco switches — includes RADIUS setup, switch commands, troubleshooting, and best practices.
Learn how to deploy Cisco HSRP for gateway redundancy, including detailed steps, priority settings, tracking, failover behavior, and verification commands.
Learn why VLAN trunks exist, how 802.1Q tagging works, the difference between ISL and 802.1Q, and how allowed VLAN lists and trunk negotiation function in Cisco networks.
Master Cisco port security techniques to prevent unauthorized devices from joining your LAN — step-by-step commands, violation modes, and best practices included.
