- A
interface ethernet 1/1 switchport port-security switchport port-security maximum 2 switchport port-security violation restrict
Why wrong: Maximum 2 allows two MACs; restrict drops but does not shut.
- B
interface ethernet 1/1 switchport port-security switchport port-security maximum 1 switchport port-security violation shutdown
This sets the maximum MAC addresses to 1 and violation action to shutdown.
- C
interface ethernet 1/1 switchport port-security switchport port-security maximum 10 switchport port-security violation protect
Why wrong: Maximum 10 allows ten; protect drops but does not shut.
- D
interface ethernet 1/1 switchport port-security manual switchport port-security mac-address 0000.1111.2222
Why wrong: 'port-security manual' is not a valid NX-OS command.
Quick Answer
The correct command sequence is to configure `switchport port-security`, `switchport port-security maximum 1`, and `switchport port-security violation shutdown` on the interface. This works because setting the maximum MAC address count to 1 locks the port to only the first dynamically learned MAC address, immediately dropping any subsequent frames from different source addresses and triggering the configured violation action. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of how port security mitigates MAC flooding attacks at the access layer, often appearing in a drag-and-drop or multiple-choice format where a common trap is forgetting the `switchport port-security` global enable command or misconfiguring the violation mode as `restrict` instead of `shutdown`. A reliable memory tip is to think of the three-step "EMS" sequence: Enable port-security, set Maximum to 1, then Shutdown on violation.
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.
An engineer needs to implement port security on a Cisco Nexus 1000v virtual switch to prevent MAC flooding attacks. The requirement is to allow only the first MAC address learned on the port. Which command sequence accomplishes this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
interface ethernet 1/1 switchport port-security switchport port-security maximum 1 switchport port-security violation shutdown
Option B is correct because the command sequence sets the maximum number of MAC addresses to 1, which ensures only the first learned MAC address is allowed on the port. The 'violation shutdown' action disables the port if a violation occurs, effectively preventing MAC flooding attacks by stopping any additional MAC addresses from being learned.
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.
- ✗
interface ethernet 1/1 switchport port-security switchport port-security maximum 2 switchport port-security violation restrict
Why it's wrong here
Maximum 2 allows two MACs; restrict drops but does not shut.
- ✓
interface ethernet 1/1 switchport port-security switchport port-security maximum 1 switchport port-security violation shutdown
Why this is correct
This sets the maximum MAC addresses to 1 and violation action to shutdown.
Clue confirmation
The clue words "first", "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
interface ethernet 1/1 switchport port-security switchport port-security maximum 10 switchport port-security violation protect
Why it's wrong here
Maximum 10 allows ten; protect drops but does not shut.
- ✗
interface ethernet 1/1 switchport port-security manual switchport port-security mac-address 0000.1111.2222
Why it's wrong here
'port-security manual' is not a valid NX-OS command.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'violation protect' (silently drops unknown traffic) and 'violation shutdown' (disables the port), and candidates may mistakenly choose 'protect' thinking it is sufficient, but only 'shutdown' fully prevents MAC flooding by stopping all traffic on the port.
Trap categories for this question
Command / output trap
'port-security manual' is not a valid NX-OS command.
Detailed technical explanation
How to think about this question
Port security on Cisco Nexus switches uses the 'switchport port-security maximum' command to limit the number of MAC addresses allowed on a port; setting it to 1 ensures only the first dynamically learned MAC is permitted. The 'violation shutdown' mode places the port in an err-disabled state upon violation, which is the most secure response to MAC flooding attacks, as it immediately stops all traffic on the port. In a virtual environment like Nexus 1000v, this prevents a compromised VM from flooding the virtual switch with fake MAC addresses to exhaust the CAM table.
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.
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FAQ
Questions learners often ask
What does this 350-601 question test?
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: interface ethernet 1/1 switchport port-security switchport port-security maximum 1 switchport port-security violation shutdown — Option B is correct because the command sequence sets the maximum number of MAC addresses to 1, which ensures only the first learned MAC address is allowed on the port. The 'violation shutdown' action disables the port if a violation occurs, effectively preventing MAC flooding attacks by stopping any additional MAC addresses from being learned.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first", "which command". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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