How would you diagnose a DNS issue compared to a network issue?

Interviewers ask this question to evaluate your technical expertise, particularly in networking and troubleshooting. By understanding how you differentiate between DNS and network issues, they can gauge your analytical skills, problem-solving approach, and familiarity with key networking concepts. They are looking for signs that you can methodically identify problems and implement effective solutions.

Begin by explaining the distinct roles of DNS and network issues. For instance, "To diagnose a DNS issue, I would first verify whether a domain name resolves to the correct IP address using command-line tools like nslookup or dig. If those commands return the correct IP but I still cannot access the website, I would then suspect a network issue. In contrast, for a network issue, I would check connectivity with tools like ping or traceroute to see if packets are being lost or if there’s a fault in the routing path." This structured explanation demonstrates both your technical knowledge and your ability to think logically through a problem.