3 hours ago
You are correct that if another switch with a lower priority were added, it could take over as the root. But the task is for the current network, not what might happen later on.
The same logic applies even if we set SW10 to priority 0. If another switch with priority 0 shows up, the MAC address still decides the root, so that’s not an absolute guarantee either.
In real networks, the root primary command is the recommended and cleaner way to set the root bridge. It follows Cisco best practices, works with the existing topology, and meets the requirement without being overly aggressive.
The same logic applies even if we set SW10 to priority 0. If another switch with priority 0 shows up, the MAC address still decides the root, so that’s not an absolute guarantee either.
In real networks, the root primary command is the recommended and cleaner way to set the root bridge. It follows Cisco best practices, works with the existing topology, and meets the requirement without being overly aggressive.