Which command would you use to clear the DNS resolver cache on Windows?

Which command would you use to clear the DNS resolver cache on Windows?

• A. ipconfig /flushdns
• B. nslookup
• C. ping -n 1 localhost
• D. tracert 8.8.8.8

Answer: (A)

Clearing the DNS resolver cache is about forcing Windows to discard its locally stored hostname-to-IP mappings so that the next lookup retrieves fresh information from DNS servers. The command that does this in Windows is ipconfig /flushdns. It tells the system to flush the resolver cache, which is useful when DNS records have changed or you’re troubleshooting name resolution issues. Other options aren’t about clearing the cache. nslookup is used to query DNS servers for specific records, not to purge cached data. ping -n 1 localhost simply pings the local machine and has no effect on DNS caching. tracert 8.8.8.8 traces the route to a destination and also doesn’t affect DNS cache.

Clearing the DNS resolver cache is about forcing Windows to discard its locally stored hostname-to-IP mappings so that the next lookup retrieves fresh information from DNS servers. The command that does this in Windows is ipconfig /flushdns. It tells the system to flush the resolver cache, which is useful when DNS records have changed or you’re troubleshooting name resolution issues.

Other options aren’t about clearing the cache. nslookup is used to query DNS servers for specific records, not to purge cached data. ping -n 1 localhost simply pings the local machine and has no effect on DNS caching. tracert 8.8.8.8 traces the route to a destination and also doesn’t affect DNS cache.