If users can reach a web server by IP address but not by its domain name, which service should be checked first?

  • ADNS
  • BDHCP lease duration only
  • CEthernet FCS
  • DCPU scheduler
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Correct Answer: A. DNS
Explanation: Successful IP connectivity with failed name-based access commonly indicates a DNS resolution problem.
Reference: Standard computer and networking fundamentals: troubleshooting