Stop rogue switches crashing your network: Quick CCNA Drill
What happens when a switch port receives an unexpected BPDU? Test your CCNA switching knowledge and drop your answer below.
The question
What happens when an access port with PortFast and BPDU Guard receives a BPDU?
The answer
A Port goes into err-disable state
BPDU Guard immediately err-disables the port to stop rogue switches from hijacking the root bridge. Don't confuse this with BPDU Filter, which silently drops them instead. Follow for tomorrow's rep.
Exam tip
Read what the question is actually asking before looking at the options. The wrong answers here are ones candidates genuinely pick — each is true of something adjacent, just not of what was asked.