Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A network administrator is configuring a trunk link between two switches. The link is up, but devices on VLAN 30 cannot communicate across the trunk. Devices on VLAN 10 and 20 can communicate. What should the administrator verify?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Ensure the native VLAN is the same on both switches
A native VLAN mismatch would cause issues with untagged traffic, but it would not selectively block a single VLAN.
B
Best answer
Verify that VLAN 30 is included in the allowed VLAN list on both switches
Trunk ports can have a configured list of allowed VLANs. If VLAN 30 is not permitted, its traffic will not pass.
C
Distractor review
Check the trunk encapsulation type on both switches
Trunk encapsulation is usually fixed to 802.1Q; a mismatch is rare and would affect all VLAN traffic, not just one.
D
Distractor review
Confirm that port security is not enabled on the trunk interfaces
Port security filters by MAC address, not by VLAN, and would not explain why only VLAN 30 is blocked.
Common exam trap
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Technical deep dive
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
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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
A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?
Question 2
A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?
Question 3
A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?
Question 4
A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?
Question 5
A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?
Question 6
A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?
FAQ
Questions learners often ask
What does this N10-009 question test?
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: Verify that VLAN 30 is included in the allowed VLAN list on both switches — A trunk link can restrict which VLANs are allowed to traverse it. If VLAN 30 is not in the allowed VLAN list on either switch, traffic from that VLAN will be dropped. The native VLAN mismatch (option A) would cause a different set of issues, typically with untagged frames. Trunk encapsulation (option B) is usually static (802.1Q) and not dynamically negotiated in modern networks. Port security (option D) would block specific MAC addresses, not an entire VLAN.
What should I do if I get this N10-009 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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