The answer is that sticky MAC learning allows secure MAC addresses to be learned dynamically and used by port security, combining automatic discovery with administrative control. In this scenario, with a maximum of two secure MACs, sticky learning lets the switch automatically record the first two source MAC addresses it sees and immediately treat them as port-security entries, saving the administrator from manually typing each address. This is a core CCNA 200-301 v2 concept because it tests your understanding that sticky learning works in tandem with port security rather than replacing it—a common trap is assuming sticky learning disables the maximum limit or changes the port mode. On the exam, remember that sticky addresses become part of the running configuration and can be saved to startup-config for persistence, making them effectively static after dynamic learning. A useful memory tip: sticky is like a glue trap—it catches the first MACs that walk in and holds them fast.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and 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. A key principle to apply: sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement.. 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.
A switchport is configured with sticky MAC learning and a maximum secure MAC value of 2. What is the main benefit of sticky learning in this situation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It allows secure MAC addresses to be learned dynamically and used by port security.
Sticky MAC learning allows the switch to learn secure MAC addresses dynamically and treat them as port-security entries without the administrator typing them manually. In plain language, it combines some of the convenience of automatic learning with the control of port security. If the configuration is later saved, those learned entries can become persistent.
This is a common CCNA port-security concept because it shows how sticky learning works with, not instead of, port security. The correct answer is the one focused on dynamic secure learning and convenience, not on disabling the maximum limit or turning the port into a trunk.
Key principle: Sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It allows secure MAC addresses to be learned dynamically and used by port security.
Why this is correct
This is correct because sticky learning records observed MACs as secure addresses.
Related concept
Sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement.
✗
It removes the maximum secure MAC limit automatically.
Why it's wrong here
This is wrong because sticky learning does not eliminate the configured maximum.
When this WOULD be correct
In a different scenario where a question asks about a feature that automatically adjusts security settings based on learned MAC addresses, option B could be correct if it described a hypothetical switch configuration that dynamically increases the maximum secure MAC limit based on certain conditions, such as network load or device types.
✗
It converts the port into a trunk after two MAC addresses are learned.
Why it's wrong here
This is wrong because sticky learning does not change the port into a trunk.
When this WOULD be correct
In a different scenario where a question asks about a switchport that is configured to automatically convert to trunking mode after a certain number of MAC addresses are learned, option C could be correct if the switch supports such functionality. For example, if the question specifies a switch model that has a feature allowing dynamic trunking based on MAC address thresholds.
✗
It disables port security after the first reboot.
Why it's wrong here
This is wrong because sticky entries can persist if the configuration is saved.
When this WOULD be correct
In a different exam scenario where the question states that sticky MAC learning is configured to automatically disable port security after a reboot, option D would be correct. This could be a question focused on understanding specific behaviors of port security features under certain configurations.
Option-by-option analysis
Why each answer is right or wrong
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.
✓It allows secure MAC addresses to be learned dynamically and used by port security.Correct answer▾
Why this is correct
This is correct because sticky learning records observed MACs as secure addresses.
✗It removes the maximum secure MAC limit automatically.Wrong answer — click to see why▾
Why this is wrong here
Sticky MAC learning does not remove or override the configured maximum secure MAC limit. The maximum value of 2 still applies, and once two MAC addresses are learned, no additional addresses will be allowed.
★ When this WOULD be the correct answer
In a different scenario where a question asks about a feature that automatically adjusts security settings based on learned MAC addresses, option B could be correct if it described a hypothetical switch configuration that dynamically increases the maximum secure MAC limit based on certain conditions, such as network load or device types.
Why candidates choose this
Students might think that 'sticky' implies flexibility or that it can override limits, confusing it with other features that dynamically adjust parameters.
✗It converts the port into a trunk after two MAC addresses are learned.Wrong answer — click to see why▾
Why this is wrong here
Sticky MAC learning is a port security feature and does not affect the port's operational mode. The port remains an access port unless explicitly configured as a trunk.
★ When this WOULD be the correct answer
In a different scenario where a question asks about a switchport that is configured to automatically convert to trunking mode after a certain number of MAC addresses are learned, option C could be correct if the switch supports such functionality. For example, if the question specifies a switch model that has a feature allowing dynamic trunking based on MAC address thresholds.
Why candidates choose this
Students may confuse the concept of learning multiple MAC addresses with trunking, which allows multiple VLANs, but sticky learning does not change the port type.
✗It disables port security after the first reboot.Wrong answer — click to see why▾
Why this is wrong here
Sticky MAC addresses are saved to the running configuration and can persist across reboots if the configuration is saved to startup-config. Port security remains enabled after reboot unless explicitly disabled.
★ When this WOULD be the correct answer
In a different exam scenario where the question states that sticky MAC learning is configured to automatically disable port security after a reboot, option D would be correct. This could be a question focused on understanding specific behaviors of port security features under certain configurations.
Why candidates choose this
The term 'sticky' might be misinterpreted as temporary or non-persistent, leading to the incorrect assumption that it disables security after reboot.
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
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is to assume that sticky MAC learning disables the maximum secure MAC address limit or automatically converts the port into a trunk. Some candidates mistakenly believe sticky learning removes the configured maximum or disables port security after reboot. However, sticky learning only dynamically learns and locks MAC addresses up to the configured maximum and requires saving the configuration to persist. Misunderstanding this can lead to selecting incorrect answers that imply sticky learning changes port behavior beyond dynamic secure MAC address learning.
Detailed technical explanation
How to think about this question
Sticky MAC learning is a feature of Cisco port security that allows a switchport to dynamically learn MAC addresses and then convert those learned addresses into secure MAC addresses automatically. This means the switch records the MAC addresses it sees on the port and treats them as if they were manually configured secure addresses. This approach combines the flexibility of dynamic learning with the security benefits of port security by limiting which devices can send traffic through the port.
When sticky learning is enabled with a maximum secure MAC address limit, such as 2 in this case, the switchport will learn up to that number of MAC addresses dynamically and then enforce port security by only allowing those learned addresses. If additional MAC addresses appear beyond the limit, the port can take security actions like shutting down or restricting traffic. The administrator can save the running configuration to make these sticky addresses persistent across reboots.
A common exam trap is to confuse sticky learning with disabling port security limits or changing port modes. Sticky learning does not remove the maximum secure MAC address limit nor convert the port into a trunk. Instead, it simply automates the process of learning and locking down MAC addresses, providing a balance between security and administrative ease. Understanding this distinction is crucial for correctly answering CCNA questions on port security.
KKey Concepts to Remember
Sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement.
The maximum secure MAC address value limits how many MAC addresses can be learned and secured on a port, even when sticky learning is enabled.
Port security with sticky learning requires saving the configuration to make dynamically learned secure MAC addresses persistent across device reloads.
Sticky learning does not disable port security limits or convert the port into a trunk; it only automates secure MAC address learning.
If the number of learned MAC addresses exceeds the maximum secure MAC limit, port security actions such as shutdown or restrict are triggered.
Sticky MAC addresses behave like manually configured secure addresses once learned, providing both security and administrative convenience.
Port security with sticky learning helps prevent unauthorized devices from accessing the network by limiting allowed MAC addresses dynamically.
Understanding sticky learning’s role in port security helps avoid common exam traps related to port mode changes or limit removal.
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
Sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — Sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement..
What is the correct answer to this question?
The correct answer is: It allows secure MAC addresses to be learned dynamically and used by port security. — Sticky MAC learning allows the switch to learn secure MAC addresses dynamically and treat them as port-security entries without the administrator typing them manually. In plain language, it combines some of the convenience of automatic learning with the control of port security. If the configuration is later saved, those learned entries can become persistent.
This is a common CCNA port-security concept because it shows how sticky learning works with, not instead of, port security. The correct answer is the one focused on dynamic secure learning and convenience, not on disabling the maximum limit or turning the port into a trunk.
What should I do if I get this 200-301 question wrong?
Review sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Sticky MAC learning allows a switchport to dynamically learn MAC addresses and convert them into secure addresses for port security enforcement.
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