XK0-005 Question #1307: Real Exam Question with Answer & Explanation

Question

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? ping -n 192.168.1.100 A.

Options

• Bhost in-add.arpa
• Cdig -x 192.168.1.100
• Etracepath -n 192.168.1.100

Explanation

To verify the configuration of in-addr.arpa zone files, an administrator should perform a reverse DNS lookup for an IP address.

Common mistakes.

• A. ping -n 192.168.1.100 tests network connectivity to the IP address and explicitly avoids performing a DNS lookup (-n), so it does not verify reverse DNS functionality.
• B. host in-add.arpa attempts to resolve the domain name 'in-add.arpa', which is not how you test reverse DNS resolution for a specific IP address.
• E. tracepath -n 192.168.1.100 traces the network path to an IP address and optionally avoids DNS lookups (-n), but it does not verify reverse DNS resolution.

Concept tested. Verifying reverse DNS (PTR records)

Reference. https://linux.die.net/man/1/dig

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