CompTIA Updated XK0-005 Exam Questions and Answers by helen

The docker exec ls command can be used to verify whether the built container has the app.go file in its root directory. This command will run the ls command inside the specified container and list the files and directories in its root directory. If the app.go file is present, it will be displayed in the output. The docker image inspect command will display information about an image, not a container, and it will not list the files inside the image. The docker container inspect command will display information about a container, not its files. The docker ps command is invalid, as ps does not accept a container name as an argument. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 16: Virtualization and Cloud Technologies, page 499.

The presence of a static entry in /etc/hosts for www.comptia.org forces the system to use this IP address instead of querying DNS.

This prevents proper IPv6 (AAAA) resolution, as /etc/hosts only contains an IPv4 (A) record.

Removing this static entry allows the system to query DNS for both IPv4 and IPv6 records.

References:

Linux /etc/hosts File – Linux Documentation

The script is missing the execute permission. Using chmod 750 startup.sh adds execute permissions for the owner and grants read and execute permissions for the group, allowing the script to run. Without execute permissions, the shell cannot run the script.

The /etc/sudoers file defines user privileges and access to root-level commands.

Option A (Correct): The administrator should grant sudo privileges by modifying /etc/sudoers using visudo.

Option B: /etc/login.defs controls system-wide authentication policies, not sudo access.

Option C: /etc/group manages group memberships but does not grant sudo access.

Option D: /etc/shadow stores password hashes, unrelated to sudo access.