Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Users in a small office can access external websites normally, but they cannot reach the internal company wiki server at 192.168.10.25. A technician can successfully ping the server's IP address from a user's workstation. The DNS resolution for the wiki's hostname (wiki.company.local) returns the correct IP. The company's firewall permits HTTP traffic to the server. What is the most likely cause of the issue?
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
The web server service is not running or is listening on a different port
Correct. If the service is not available, the browser cannot establish a TCP connection to the web server, even though network connectivity exists.
B
Distractor review
The default gateway on the server is misconfigured
If the server's gateway were misconfigured, ping replies would likely fail or be asymmetric. Since ping works, the gateway is probably fine.
C
Distractor review
The user's workstation has a duplicate IP address
A duplicate IP would cause intermittent connectivity issues and likely affect ping as well, but the symptom is isolated to web access.
D
Distractor review
The DNS cache on the workstation is poisoned
The technician confirmed that DNS resolves correctly to 192.168.10.25, so DNS is not the issue.
Common exam trap
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Technical deep dive
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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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?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: The web server service is not running or is listening on a different port — Since ping works, Layer 3 connectivity is fine. DNS resolves correctly. Firewall rules are in place. The most likely cause is that the web service (e.g., Apache, IIS) is not running on the server or is not listening on the expected TCP port (80/443). This would cause the browser to time out or display an error, even though ping succeeds.
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.
Discussion
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