Turbocharge Your IT Journey: Ace the Cisco Certified Network Pro Test 2025 – Network Ninja Style!

The command that enables Loop Guard globally on a Cisco switch is aptly identified as "spanning-tree loopguard default." When this command is executed, it activates Loop Guard for all switch ports that participate in a spanning tree. Loop Guard is a feature that helps prevent loops in a spanning tree topology by detecting situations where a port that should be in a designated state becomes designated as blocking due to a failure in receiving Bridge Protocol Data Units (BPDUs). By enabling Loop Guard globally, you ensure that the switch continuously monitors the topology and protects against potential loops that can disrupt network stability.

The other options focus on different aspects of spanning tree configuration. For instance, "spanning-tree bpduguard enable" is utilized to protect ports from receiving BPDUs which might cause them to transition to a forwarding state when they should not, while "spanning-tree portfast bpduguard default" applies settings specifically to PortFast-enabled ports. The command "spanning-tree guard loop" pertains to per-port configuration rather than a global setting, making it less applicable in this context. Understanding these distinctions is crucial for effectively managing spanning tree protocols and enhancing network reliability.