Quick Answer
The answer is protect. This port security violation mode silently drops frames from unauthorized MAC addresses while keeping the interface fully operational, and it does not generate an SNMP trap or syslog message, making it the only mode that operates without any notification or counter increment. In contrast, restrict also drops frames but increments the violation counter and can send notifications, while shutdown disables the port entirely. On the CCNA 200-301 v2 exam, this distinction tests your understanding of how each violation mode handles unauthorized traffic differently, often appearing in multiple-choice questions that ask which mode drops traffic without alerting the network management system. A common trap is confusing restrict with protect because both keep the interface up, but remember that restrict logs the violation and protect does not. For a quick memory tip, think of protect as the silent guardian: it protects the port by dropping bad traffic without making a sound.
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected.. 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.
Which port-security violation mode drops frames from unauthorized MAC addresses but keeps the interface up and does not send an SNMP trap or syslog message?
protect
Correct. Protect is the quietest enforcement mode.
restrict
Why wrong: Restrict provides similar forwarding behavior but tracks and reports violations.
shutdown
Why wrong: Shutdown places the port into err-disabled state after a violation.
shutdown vlan
Why wrong: Shutdown vlan is not the standard switchport port-security violation mode being tested here.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
protect
Protect silently drops frames from unauthorized sources while leaving the interface up. Restrict also drops frames but increments the violation counter and can generate notifications.
Key principle: Port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
protect
Why this is correct
Correct. Protect is the quietest enforcement mode.
Related concept
Port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected.
restrict
Why it's wrong here
Restrict provides similar forwarding behavior but tracks and reports violations.
When this WOULD be correct
In a different question, if asked about a port-security mode that drops unauthorized MAC frames but also sends alerts to network management systems, 'restrict' would be the correct answer, as it fits the criteria of notifying administrators while maintaining interface functionality.
shutdown
Why it's wrong here
Shutdown places the port into err-disabled state after a violation.
When this WOULD be correct
In a question asking for a port-security violation mode that completely disables the interface upon detecting unauthorized MAC addresses, 'shutdown' would be the correct answer. This scenario would focus on a strict security posture where any unauthorized access leads to immediate interface shutdown.
shutdown vlan
Why it's wrong here
Shutdown vlan is not the standard switchport port-security violation mode being tested here.
When this WOULD be correct
In a scenario where the question asks which port-security violation mode disables a specific VLAN but still allows other VLANs to function normally, 'shutdown vlan' would be the correct answer. This could involve a focus on VLAN-specific security measures rather than interface status.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is correct
Correct. Protect is the quietest enforcement mode.
Why this is wrong here
The 'restrict' mode allows frames from unauthorized MAC addresses to be dropped while sending SNMP traps and syslog messages, which contradicts the requirement of keeping the interface up without notifications.
★ When this WOULD be the correct answer
In a different question, if asked about a port-security mode that drops unauthorized MAC frames but also sends alerts to network management systems, 'restrict' would be the correct answer, as it fits the criteria of notifying administrators while maintaining interface functionality.
Why candidates choose this
Candidates may choose 'restrict' because it sounds similar to 'protect' and implies a proactive approach to security, leading them to mistakenly associate it with a mode that drops unauthorized traffic without shutting down the interface.
Why this is wrong here
The 'shutdown' mode disables the interface when a violation occurs, which is contrary to the requirement of keeping the interface up. It also does not align with the need to drop frames without sending SNMP traps or syslog messages.
★ When this WOULD be the correct answer
In a question asking for a port-security violation mode that completely disables the interface upon detecting unauthorized MAC addresses, 'shutdown' would be the correct answer. This scenario would focus on a strict security posture where any unauthorized access leads to immediate interface shutdown.
Why candidates choose this
Candidates may choose 'shutdown' because it is a well-known port-security mode that directly addresses unauthorized access, leading to confusion with the requirement to drop frames while keeping the interface operational.
Why this is wrong here
The 'shutdown vlan' mode disables the entire VLAN when a violation occurs, which is not aligned with the requirement to keep the interface up. This option also typically sends SNMP traps or syslog messages, which contradicts the question's criteria.
★ When this WOULD be the correct answer
In a scenario where the question asks which port-security violation mode disables a specific VLAN but still allows other VLANs to function normally, 'shutdown vlan' would be the correct answer. This could involve a focus on VLAN-specific security measures rather than interface status.
Why candidates choose this
Candidates may find 'shutdown vlan' tempting because it suggests a strong security posture by disabling a VLAN, which might seem like a logical choice when considering unauthorized access prevention.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Be careful not to confuse Protect with Restrict, as both drop frames but only Restrict sends notifications.
Trap categories for this question
Similar concept trap
Restrict provides similar forwarding behavior but tracks and reports violations.
Detailed technical explanation
Port-security is a Layer 2 security feature on Cisco switches that restricts input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When a frame with an unauthorized MAC address is received, the switch triggers a violation event. The violation mode configured on the port determines the switch's response to this event, which can range from silently dropping frames to disabling the port entirely. The protect violation mode is the least intrusive enforcement method. It drops frames from unauthorized MAC addresses without generating any log messages or SNMP traps, and crucially, it keeps the interface in an up state. This mode is useful when administrators want to enforce security quietly without alerting network management systems or disrupting legitimate traffic. In contrast, the restrict mode also drops unauthorized frames but increments violation counters and sends notifications, while the shutdown mode disables the port by placing it into an err-disabled state, requiring manual intervention to restore connectivity. A common exam trap is confusing protect with restrict mode because both drop unauthorized frames. However, protect is silent and non-disruptive, whereas restrict provides alerts and counters. Misunderstanding this distinction can lead to incorrect answers. Practically, protect mode is ideal in environments where maintaining port availability is critical and administrators prefer to monitor violations manually rather than receive automated alerts. This behavior aligns with Cisco’s design to offer flexible security enforcement tailored to network policies.
Key takeaway
Port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected.
Real-world example
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
Review port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — Port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected..
The correct answer is: protect — Protect silently drops frames from unauthorized sources while leaving the interface up. Restrict also drops frames but increments the violation counter and can generate notifications.
Review port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected., then practise related 200-301 questions on the same topic to reinforce the concept.
Port-security violation modes determine how a switch port reacts when frames from unauthorized MAC addresses are detected.
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Last reviewed: May 17, 2026
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