CompTIA Linux+ (XK0-004) — Question 215

An administrator completed the configuration of the in-addr.arpa zone files for an organization.
Which of the following commands should the administrator use to verify the configuration is working as expected?

Answer options

• A. ping -n 192.168.1.100
• B. host in-add.arpa
• C. dig -x 192.168.1.100
• D. nslookup in-addr.arpa
• E. tracepath -n 192.168.1.100

Correct answer: C

Explanation

The command 'dig -x 192.168.1.100' is used to perform a reverse DNS lookup, which is essential for verifying the configuration of in-addr.arpa zone files. Other options, such as 'ping' and 'tracepath', check connectivity rather than DNS configuration, while 'host' and 'nslookup' do not specifically verify reverse lookups for the given IP.