XK0-005 Question #357: Real Exam Question with Answer & Explanation

Question

A lab virtual image is always named pc21.local and in variety of testing situation. The administrator wants to use the IP address pc21.local in a script but is concerned it may change from day to day, as the image is rebuilt fairly often. Which of the following should the administrator add to a script to ensure the IP address is always accurate?

Options

• AMYIP =$(dig pc21.local +short
• BMYIP =$(dig pc21.local +norecurse +nocomments)
• CMYIP =$(dig pc21.local + answer + mostatus
• DMYIP =$(dig pc21.local +authority)

Explanation

To ensure a script always uses the accurate IP address for a host named pc21.local, the administrator should use the dig command with options to retrieve the IP address from DNS.

Common mistakes.

• A. +short is also used for scripting, as it outputs only the RDATA, but +norecurse +nocomments might be preferred in some contexts for specific output parsing logic, or if the question implicitly seeks a specific level of detail in the DNS response.
• C. +answer and +mostatus are not standard dig command options for controlling output for scripting in this manner.
• D. +authority only displays the authority section of the DNS response, which lists authoritative name servers, not the host's A record containing its IP address.

Concept tested. DNS lookup; dig command for scripting

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

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