XK0-005 · Question #1317
XK0-005 Question #1317: Real Exam Question with Answer & Explanation
The correct answer is A: Perform a MD5 hash on the data.. To best verify that retrieved backup data has not been modified since it was created, a systems administrator should perform an MD5 hash on the data and compare it with a previously stored hash value.
Question
A systems administrator has retrieved the latest copy of the system backup files, which had been stored offsite at a third-party vendor. The systems administrator wants to validate that the data was not modified since the backup. Which of the following would BEST verify that the data remained the same?
Options
- APerform a MD5 hash on the data.
- BPerform a SCP from the backup.
- CPerform rsync.
- DRestore from the last full backup.
Explanation
To best verify that retrieved backup data has not been modified since it was created, a systems administrator should perform an MD5 hash on the data and compare it with a previously stored hash value.
Common mistakes.
- B. SCP (Secure Copy Protocol) is used for secure file transfer, not for verifying data integrity after retrieval; it ensures secure transmission but not that the source data itself was unchanged.
- C. Rsync is a utility for efficient file synchronization and transfer, which can identify differences, but it is not primarily used as a standalone method for verifying the integrity of already retrieved data against a baseline.
- D. Restoring from the last full backup is an action of data recovery, not a method to verify the integrity of a specific backup file by comparing it to its original state.
Concept tested. Data integrity verification using hashing
Reference. https://www.gnu.org/software/coreutils/manual/html_node/md5sum-invocation.html
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