Edward Mooney

How to Troubleshoot a Cisco STP Blocking Port Spanning Tree Protocol (STP) prevents Layer 2 loops by placing redundant ports into a blocking state. This is normal behavior in a switched net...

Configuring a DHCP Relay Agent on Cisco IOS Routers In many enterprise networks, DHCP servers are centralized in a data center while client devices exist across many different subnets...

Protecting Your Network with Cisco DHCP Snooping DHCP Snooping is a Layer 2 security feature available on Cisco switches that prevents unauthorized DHCP servers from distributing IP a...

Troubleshooting Cisco DHCP Relay with ip helper-address In many enterprise networks, DHCP servers are located in a centralized server VLAN while clients exist in many different subnets. Sin...

How to Troubleshoot Cisco EtherChannel Problems EtherChannel allows multiple physical interfaces to operate as a single logical link. It improves bandwidth and redundancy, but it only works...

Configuring VLANs and Trunk Links on Cisco Switches VLANs allow administrators to segment networks logically while using the same physical infrastructure. Create VLANs...

Practical Cisco VLAN Troubleshooting Using IOS Commands Virtual LANs (VLANs) are fundamental to network segmentation in enterprise enviro...

Diagnosing Cisco Trunk Port Mismatches Using IOS Trunk links connect switches and carry traffic for multiple VLANs using IEEE 802.1Q tagging. When trunk ports are misconfigured, VLAN traffi...