Cisco Certified Network Professional 2026 – 400 Free Practice Questions to Pass the Exam

The command to enable extended bridge ID format is accurately identified as "spanning-tree extend system-id." This command modifies the spanning-tree protocol behavior by extending the bridge ID format, which is crucial for supporting larger Layer 2 networks.

When the extended bridge ID format is enabled, it incorporates the VLAN ID into the bridge ID, effectively allowing for more unique bridge identifiers. This is especially important when dealing with networks that utilize numerous VLANs, as it helps prevent issues related to bridge ID collisions and enhances the stability and scalability of the spanning tree topology.

It's worth noting that the other options do not represent valid commands for enabling the extended bridge ID format. They either misstate the command syntax or use terminology that isn't recognized in the context of Cisco's spanning-tree configuration.