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>> Official XK0-006 Study Guide <<
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NEW QUESTION # 86
A Linux systems administrator needs to extract the contents of a file named
/home/dev/web.bkpto the /var/www/html/directory. Which of the following commands should the administrator use?
Answer: B
Explanation:
The .bkp file here is a cpio archive, not a tar or zip. The correct way to extract it is by changing into the target directory (/var/www/html/) and using cpio -idv < /home/dev/web.bkp. The pushd and popd commands ensure the administrator returns to the original directory afterward.
NEW QUESTION # 87
A Linux administrator receives reports about MySQL service availability issues. The administrator observes the following information:
Which of the following explains why the server was offline?
Answer: B
Explanation:
The logs show mysqld invoked oom-killer, which is the Linux Out-Of-Memory (OOM) killer. This indicates MySQL consumed too much memory, forcing the kernel to terminate it to protect the system, which caused the service outage.
NEW QUESTION # 88
A Linux administrator attempts to log in to a server over SSH as root and receives the following error message: Permission denied, please try again. The administrator is able to log in to the console of the server directly with root and confirms the password is correct. The administrator reviews the configuration of the SSH service and gets the following output:
Based on the above output, which of the following will most likely allow the administrator to log in over SSH to the server?
Answer: C
Explanation:
The SSH configuration option PermitRootLogin prohibit-password prevents the root user from logging in with password authentication. This setting means root cannot use a password to log in via SSH; only key- based authentication is permitted for root. The administrator can still log in as root locally, which is not affected by this SSH configuration. To allow SSH access as root, the administrator must use an SSH key instead of a password.
Other options:
A). MaxSessions controls the number of simultaneous SSH sessions but is not causing the login denial here.
B). PAM (Pluggable Authentication Modules) is disabled, but enabling it is not required for basic SSH authentication.
C). Changing the SSH port is unrelated to the authentication method issue.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: " Securing Linux " , Section: " Securing SSH Access " CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security
NEW QUESTION # 89
A Linux user needs to download the latest Debian image from a Docker repository. Which of the following commands makes this task possible?
Answer: A
Explanation:
The correct answer is B. docker image pull debian because it is the standard Docker command used to download container images from a remote repository such as Docker Hub. In Docker terminology, "pulling" an image means retrieving it from a remote registry and storing it locally so it can be used to create containers.
When a user executes docker image pull debian, Docker connects to the default registry (Docker Hub), searches for the official Debian image, and downloads the latest version (by default, the "latest" tag unless otherwise specified). This command is essential in container-based workflows and is commonly used in automation, orchestration, and DevOps environments.
Option A (docker image init debian) is incorrect because there is no valid Docker command called init under docker image. Initialization of containers is handled differently, typically via docker run.
Option C (docker image import debian) is incorrect because import is used to create a Docker image from a local tarball or file, not to download from a remote repository.
Option D (docker image save debian) is incorrect because save is used to export an existing local image into a tar archive for backup or transfer purposes. It does not download images.
From a Linux+ perspective, understanding container management is a key part of automation and orchestration. Commands like docker pull allow administrators to quickly provision environments, deploy applications, and maintain consistency across systems. This makes it a fundamental skill for modern Linux system administration and DevOps practices
NEW QUESTION # 90
An administrator updates the network configuration on a server but wants to ensure the change will not cause an outage if something goes wrong. Which of the following commands allows the administrator to accomplish this goal?
Answer: C
Explanation:
netplan try applies the new network configuration temporarily and waits for user confirmation. If not confirmed, it automatically reverts, preventing outages from misconfigurations.
NEW QUESTION # 91
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