Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
After replacing a faulty network cable, a user reports that they can access local resources but not the internet. The technician verifies that the user's IP address is 192.168.1.100 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician can ping the default gateway successfully. Which of the following should the technician check NEXT?
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
Best answer
A) DNS configuration
Correct. DNS resolves domain names to IP addresses; if DNS is misconfigured, the user can reach IP addresses but not domain names. Since the gateway is reachable, DNS is the most likely next check.
B
Distractor review
B) DHCP server
The user already has an IP address (192.168.1.100), so the DHCP server is functioning. This is not the issue.
C
Distractor review
C) Router's firewall ACLs
While firewall ACLs could block internet traffic, the user can ping the gateway, so layer 3 connectivity exists. DNS is a more common cause and should be checked first.
D
Distractor review
D) Switch port VLAN assignment
If the VLAN were incorrect, the user would likely not have local connectivity. Since local resources are accessible, VLAN assignment is not the issue.
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: A) DNS configuration — Since the user can reach the default gateway, the issue is likely with name resolution. Checking DNS configuration is the next logical step. DHCP is working if the user has an IP. Router firewall might block external traffic, but DNS is more specific. VLAN assignment wouldn't affect internet vs local if gateway is reachable.
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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