Why Does Only One User Experience Incorrect DNS Resolution?
A user is unable to navigate to a website because the provided URL is not resolving to the correct IP address. Other users are able to navigate to the intended website without issue. Which of the following is most likely causing this issue?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
This question tests understanding of DNS resolution order and local versus global configuration issues, with the common trap being confusion between local overrides and broader DNS infrastructure failures.
When a single user cannot resolve a URL to the correct IP while others access it normally, the issue is typically local rather than network-wide. Community consensus confirms the hosts file is the most likely culprit due to its ability to override standard DNS resolution.
Users often select Nameserver record because they associate URL resolution failures with DNS server problems, but this would cause widespread resolution failures across all clients instead of isolating to one user.
Community Discussion (3 comments)
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Expert Analysis
Why the Answer Is Correct
The hosts file is a local, static text file that maps hostnames to IP addresses before any external DNS query is initiated. Because it resides directly on the endpoint, an incorrect or malicious entry will only impact that specific machine's resolution behavior. Modern operating systems evaluate the hosts file prior to contacting recursive DNS servers, making it a direct override mechanism. As highlighted by community contributors, this local precedence perfectly explains why other users experience no connectivity issues.Why the Other Options Are Wrong
A self-signed certificate affects HTTPS trust and encryption validation, not IP address resolution. A nameserver record refers to authoritative DNS data; if misconfigured, it would disrupt resolution for every client querying that specific zone. An IP helper service forwards DHCP broadcast packets across routed subnets and plays no role in hostname-to-IP mapping or traffic routing.Community Comment Notes
Multiple high-voted comments emphasize that the hosts file acts as a local DNS override, directly validating option A. One contributor notes its historical utility for blocking websites by redirecting domains locally, demonstrating its powerful precedence over live DNS queries. Another analyst stresses that isolated resolution failures strongly indicate a local configuration problem rather than a network-wide DNS outage. These practical insights reinforce the troubleshooting methodology of prioritizing endpoint checks when symptoms remain user-specific.Official Reference
Exam Strategy
Always isolate the scope of the problem during troubleshooting questions; if only one device or user is affected, prioritize local configurations over network infrastructure. Practice recognizing resolution order hierarchies, such as how the hosts file bypasses DNS, to quickly eliminate distractors on exam day.
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