Question 1mediummatching
Full question →Match each switchport or VLAN term to its most accurate meaning.
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mediummatchingObjective-mapped
Match each switchport or VLAN term to its most accurate meaning.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is confusing the native VLAN with the access VLAN or assuming all traffic on a trunk is tagged. The native VLAN carries untagged frames on a trunk, which can cause security risks if left as VLAN 1 or mismatched between switches. Another common mistake is thinking the allowed VLAN list on a trunk port is the same as the VLANs assigned to access ports. The allowed VLAN list only restricts VLANs on trunks, not access ports. Misunderstanding these distinctions can cause VLAN leaks or connectivity failures in the exam scenario.
Technical deep dive
How to think about this question
VLANs (Virtual Local Area Networks) segment a physical network into multiple logical networks to improve security and reduce broadcast domains. Switch ports can be configured as access or trunk ports. An access port is assigned to a single VLAN and carries untagged traffic from end devices. In contrast, a trunk port carries traffic for multiple VLANs by tagging frames with VLAN IDs using the IEEE 802.1Q standard. This tagging allows switches to identify which VLAN each frame belongs to as it traverses the trunk link. The native VLAN is a special VLAN on a trunk port that handles untagged frames. By default, Cisco switches use VLAN 1 as the native VLAN, but best practice is to change it to a different VLAN to avoid security risks. The allowed VLAN list on a trunk port controls which VLANs are permitted to send traffic across the trunk, providing a way to limit VLAN propagation and reduce unnecessary traffic. Proper configuration of native VLAN and allowed VLANs is critical to maintain VLAN isolation and prevent VLAN hopping attacks. A common exam trap is confusing access ports with trunk ports or misunderstanding the role of the native VLAN. Access ports do not tag frames and carry only one VLAN, while trunk ports tag frames and carry multiple VLANs. Misconfiguring the native VLAN or allowed VLAN list can lead to untagged traffic being misrouted or VLAN leakage. In practical networks, consistent trunk configuration on both ends and careful native VLAN assignment prevent connectivity issues and security vulnerabilities.
KKey Concepts to Remember
- An access port on a Cisco switch carries traffic for exactly one VLAN and is typically used to connect end devices like PCs or printers.
- A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using the 802.1Q protocol.
- The native VLAN on a trunk port is the VLAN associated with untagged frames, allowing legacy or untagged traffic to be properly handled.
- The allowed VLAN list on a trunk port restricts which VLANs are permitted to traverse that trunk, enhancing security and traffic control.
- Cisco switches use 802.1Q encapsulation to tag VLAN frames on trunk links, except for frames in the native VLAN which remain untagged.
- Misconfiguring the native VLAN or allowed VLAN list on trunks can cause VLAN hopping or traffic leakage between VLANs.
- Access ports do not tag frames with VLAN information; the switch assigns incoming frames to the configured VLAN based on the port.
- Trunk ports must be configured consistently on both ends to ensure proper VLAN tagging and avoid connectivity issues.
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
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Question 5
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Question 6
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FAQ
Questions learners often ask
What does this 200-301 question test?
An access port on a Cisco switch carries traffic for exactly one VLAN and is typically used to connect end devices like PCs or printers.
What exam trap should I watch out for?
Common exam trap: answer the scenario, not the keyword: A frequent exam trap is confusing the native VLAN with the access VLAN or assuming all traffic on a trunk is tagged. The native VLAN carries untagged frames on a trunk, which can cause security risks if left as VLAN 1 or mismatched between switches. Another common mistake is thinking the allowed VLAN list on a trunk port is the same as the VLANs assigned to access ports. The allowed VLAN list only restricts VLANs on trunks, not access ports. Misunderstanding these distinctions can cause VLAN leaks or connectivity failures in the exam scenario.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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