The correct answer is to add 'spanning-tree bpdufilter enable' on the interface. This configuration prevents the switch from processing BPDUs received from the server, which stops the port from being placed into a blocking state while still allowing it to function as an edge port for rapid convergence. The core issue is that a non-switch device is sending BPDUs, and BPDU filter on an edge port suppresses both sending and receiving BPDUs, ensuring the port remains in forwarding mode. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of STP edge port behavior and the distinction between BPDU filter and BPDU guard—a common trap is confusing the two, as guard only protects against unexpected BPDUs by err-disabling the port, whereas filter silently ignores them. Remember the memory tip: “Filter forgets, Guard guards”—BPDU filter ignores all BPDU traffic, while BPDU guard reacts by shutting the port down.
350-601 Security Practice Question
This 350-601 practice question tests your understanding of security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Option C is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
BPDU filter, when configured on an interface, both prevents the switch from sending BPDUs out that port and ignores any BPDUs received on that port, effectively making the port behave as if it is not part of the spanning-tree topology. This is distinct from BPDU guard, which errdisables the port upon receiving a BPDU; BPDU filter is appropriate here because the server is not a switch and should not be participating in spanning-tree, but the port must remain operational. In real-world scenarios, misconfigured devices like servers with spanning-tree enabled (e.g., via NIC teaming or virtualization) can inadvertently send BPDUs, and BPDU filter provides a surgical fix without altering the port's rapid convergence behavior.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add 'spanning-tree bpdufilter enable' on the interface. — Option C is correct because 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.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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