GSEC Question #399: Real Exam Question with Answer & Explanation

The correct answer is C. sum. The Linux sum command computes a checksum and block count for a file, allowing an administrator to verify that a downloaded file was received completely and without corruption.

Question

You work as a Network Administrator for Net World Inc. The company has a Linux-based network. You have downloaded an application from the Internet. Before starting the installation, you want to ensure that the file received is in its entirety. Which of the following commands will you use?

Options

Aat
Bvi
Csum
Dmount

Explanation

The Linux sum command computes a checksum and block count for a file, allowing an administrator to verify that a downloaded file was received completely and without corruption.

Common mistakes.

A. The at command schedules commands for deferred execution at a specified time and has no file integrity verification capability.
B. vi is a terminal-based text editor used to create or modify text files, not to validate the completeness or integrity of a binary download.
D. mount attaches a filesystem or storage device to a directory in the tree; it does not inspect or verify the contents of a downloaded file.

Concept tested. Linux file integrity verification using sum

Reference. https://www.man7.org/linux/man-pages/man1/sum.1.html

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