350-601 Security Practice Question
Exhibit
interface Ethernet1/1 description Server-01 switchport mode trunk switchport trunk allowed vlan 10,20,30 spanning-tree port type edge trunk no shutdown
Refer to the exhibit. A server connected to Ethernet1/1 is experiencing intermittent connectivity. The server sends BPDUs, causing the switch to place the port into a blocking state. Which configuration change should be made to prevent this while maintaining rapid convergence?
⚠ Common exam trap
Cisco often tests the distinction between BPDU guard and BPDU filter, where candidates mistakenly choose BPDU guard (which errdisables the port) instead of BPDU filter (which silently ignores BPDUs) when the goal is to maintain connectivity while preventing spanning-tree disruption.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add 'spanning-tree bpdufilter enable' on the interface.
Enabling BPDU filter on the interface prevents the switch from processing BPDUs received from the server, which stops the port from being placed into a blocking state due to BPDU reception. This maintains rapid convergence because the port remains configured as an edge port (spanning-tree port type edge trunk), allowing it to transition directly to forwarding without spanning-tree negotiation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add 'spanning-tree guard loop' to the interface.
Why it's wrong here
Loop guard prevents alternate/root ports from becoming designated, not related to BPDU reception on an edge port.
- ✗
Remove the 'spanning-tree port type edge trunk' command and configure 'spanning-tree port type normal'.
Why it's wrong here
This would cause the port to go through normal STP states, slowing convergence.
- ✓
Add 'spanning-tree bpdufilter enable' on the interface.
Why this is correct
BPDU filter on an edge port prevents the switch from sending/receiving BPDUs, maintaining edge status.
- ✗
Change the port type to 'spanning-tree port type network trunk'.
Why it's wrong here
Network port type is for switches and expects BPDUs, causing potential loops.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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