Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A user reports that they cannot access the company's internal web application at https://apps.internal.company.com. The technician can ping the server's IP address (10.10.10.20) successfully and also successfully telnet to 10.10.10.20 on port 443. However, the web browser displays 'Unable to connect'. What is the most likely cause?
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
The web server service is stopped
If the web server service were stopped, the telnet to port 443 would have failed. Since telnet succeeded, the service is running.
B
Distractor review
DNS resolution is failing for the FQDN
DNS failure would prevent the browser from resolving the hostname, but the technician used the IP address successfully in ping and telnet. The browser could still fail if it relies on the hostname, but the symptom of 'Unable to connect' typically indicates a connection problem, not name resolution.
C
Best answer
The browser is configured to use an incorrect proxy server
If the browser is set to use a proxy server that is unavailable or misconfigured, it will fail to connect to the web server even though network connectivity is fine. Telnet and ping bypass proxy settings, confirming the server is reachable.
D
Distractor review
A firewall is blocking TCP port 443
If a firewall were blocking port 443, the telnet to that port would have failed. Since telnet succeeded, the firewall is allowing the connection.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
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?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: The browser is configured to use an incorrect proxy server — Since ping and telnet to the correct IP and port succeed, network connectivity and the web service are working. The issue is likely that the browser is using an incorrect proxy configuration (e.g., pointing to a proxy that is unreachable or misconfigured), preventing the browser from making a direct connection. DNS resolution is not the issue because the technician used the IP directly in telnet and ping; if DNS were failing, the user might not resolve the name, but ping using IP succeeded.
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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