Term 1
/dev
/dev is a special directory in Unix-like operating systems that contains files representing every hardware device and virtual device connected to the system.
Acronym study
Terms 1–30 of 226 XK0-005 acronyms and key terms. Each entry includes a plain-English definition and a link to the full 800-word glossary page with exam context and practice questions.
Term 1
/dev is a special directory in Unix-like operating systems that contains files representing every hardware device and virtual device connected to the system.
Term 2
/etc/group is a system file on Linux/Unix that stores information about user groups, including group names, passwords (if any), group IDs, and their member lists.
Term 3
A system file on Unix-like operating systems that stores essential user account information, including usernames, user IDs, and default shell settings.
Term 4
The /etc/shadow file is a system file that stores encrypted user password hashes and related security data on Linux and Unix-like operating systems.
Term 5
A virtual filesystem in Linux that provides real-time information about running processes and system resources.
Term 6
/sys is a virtual filesystem in Linux (sysfs) that exposes kernel objects, devices, drivers, and system information as files and directories for user-space interaction.
Term 7
802.1X is a network access control standard that authenticates devices before they are allowed to connect to a wired or wireless network.
Term 8
AAA (Authentication, Authorization, and Accounting) is a security framework that controls who can access a network, what they are allowed to do, and tracks what they did.
Term 9
An Access Control List is a set of rules that determines who or what can access specific network resources or data.
Term 10
Anacron is a tool that runs scheduled tasks on computers that are not always turned on, ensuring they still get executed even if the computer was off at the scheduled time.
Term 11
Android is an open-source operating system used primarily on mobile devices like smartphones and tablets, developed by Google.
Term 12
APFS (Apple File System) is a modern file system designed by Apple for solid-state drives and flash storage, offering improved performance, encryption, and space sharing across macOS, iOS, and other Apple devices.
Term 13
AppArmor is a Linux kernel security module that restricts programs to a predefined set of resources using mandatory access control (MAC) policies.
Term 14
APT (Advanced Package Tool) is a command-line utility used in Debian-based Linux distributions to install, update, remove, and manage software packages from repositories.
Term 15
apt-get is a command-line tool used in Debian-based Linux distributions to install, update, and remove software packages.
Term 16
An assigned license is a software or service license that has been specifically allocated to a particular user or device, granting that entity the right to use the licensed product.
Term 17
The 'at' command schedules a one-time task to run at a specified future time on a Linux or Unix system.
Term 18
Bash is a command-line interpreter that lets users interact with an operating system by typing text commands instead of clicking icons.
Term 19
A Bash script is a text file containing a sequence of commands for the Unix shell Bash, allowing users to automate repetitive tasks and streamline system administration on Linux and macOS.
Term 20
Btrfs is a modern copy-on-write file system for Linux that focuses on data integrity, snapshots, and advanced storage features.
Term 21
CDP is a Cisco proprietary protocol used by network devices to share information about themselves with directly connected neighbors, helping network administrators discover and understand the topology.
Term 22
The chgrp command changes the group ownership of files and directories in Linux and Unix-like operating systems.
Term 23
chmod is a command in Linux and Unix-like operating systems used to change the permissions (read, write, execute) of a file or directory.
Term 24
chown is a Linux/Unix command used to change the owner and group associated with a file or directory.
Term 25
ChromeOS is Google's lightweight operating system designed primarily for web-based applications and cloud computing, running on Chromebooks and other Chrome devices.
Term 26
A CLI (command-line interface) is a text-based way to interact with a computer's operating system by typing commands instead of clicking icons.
Term 27
A Cloud CDN is a network of servers spread around the world that stores copies of your website or app content so it loads faster for users no matter where they are.
Term 28
A managed domain name system service that translates human-readable domain names into IP addresses, enabling reliable and scalable network routing in cloud environments.
Term 29
Cloud Interconnect is a service that provides a dedicated, private, high-bandwidth connection between your on-premises network and a cloud provider's network, bypassing the public internet for improved reliability, security, and performance.
Term 30
Cloud Load Balancing is the process of distributing incoming network traffic across multiple servers or resources in the cloud to ensure no single resource is overwhelmed, improving availability and reliability.