Term 61
ext4
ext4 is the default file system for many Linux distributions, designed to store and manage files on a hard drive or SSD with journaling, large volume support, and backward compatibility.
Acronym study
Terms 61–90 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 61
ext4 is the default file system for many Linux distributions, designed to store and manage files on a hard drive or SSD with journaling, large volume support, and backward compatibility.
Term 62
An extended access control list (ACL) is a set of rules that filters network traffic based on source and destination IP addresses, protocol type, and port numbers, providing more granular control than a standard ACL.
Term 63
Fail2ban is a security tool that monitors log files for repeated authentication failures and temporarily bans the offending IP addresses using firewall rules.
Term 64
FAT32 is a file system that organizes and manages how data is stored on storage devices like USB drives and memory cards.
Term 65
File Explorer is the graphical file management tool in Windows that allows users to navigate, organize, and manage files and folders on their computer.
Term 66
A file permission is a security setting that controls who can read, write, or execute a file or directory on an operating system.
Term 67
Google Cloud Filestore is a managed file storage service that lets you mount a network file system (NFS) to multiple virtual machines simultaneously, just like a shared folder on an office network.
Term 68
Finder is the default file manager and graphical user interface shell used on macOS to organize, access, and manage files, folders, and applications.
Term 69
firewalld is a dynamic firewall management tool for Linux systems that controls incoming and outgoing network traffic using zones and rules.
Term 70
Flatpak is a software utility for Linux that allows you to install, manage, and run applications in a sandboxed environment, making them work across different Linux distributions.
Term 71
Folder permission is a security setting that determines which users or groups can access, modify, or manage a folder and its contents on an operating system.
Term 72
fsck is a command-line tool that checks and repairs inconsistencies in a file system, ensuring data integrity.
Term 73
fstab is a system configuration file in Linux that defines how and where storage devices and partitions are mounted at boot time.
Term 74
getfacl is a Linux/Unix command that displays the Access Control Lists (ACLs) for files and directories, showing detailed permissions beyond the standard user-group-other model.
Term 75
Group Policy is a Windows-based feature that allows administrators to centrally manage and enforce settings for users and computers across an organization.
Term 76
groupadd is a Linux command that creates a new user group on a system, used to organize users and manage permissions collectively.
Term 77
GRUB (Grand Unified Bootloader) is a boot loader package that loads and manages the operating system startup process on Linux and other Unix-like systems.
Term 78
A Graphical User Interface (GUI) is a visual way for users to interact with a computer or device using icons, buttons, and windows instead of typing text commands.
Term 79
A hard link is a directory entry that associates a name with a file's data on a storage device, allowing multiple filenames to point to the same underlying inode and data blocks.
Term 80
Implicit deny is a security rule that automatically blocks any network traffic that is not explicitly allowed by an access control list or firewall rule.
Term 81
An inbound ACL is a set of rules applied to network traffic entering an interface that decides whether to allow or block that traffic based on criteria like source IP, destination port, or protocol.
Term 82
An init system is the first process started by the Linux kernel during boot that manages all other processes, services, and system initialization until shutdown.
Term 83
An inode is a data structure in a Unix-like file system that stores metadata about a file, such as its size, permissions, and location on disk, but not its name.
Term 84
An inside global is the public, routable IP address that represents an internal private host when it communicates with devices on the internet.
Term 85
Inside local is the IP address assigned to a device on an internal private network before any Network Address Translation (NAT) is applied.
Term 86
insmod is a Linux command used to insert a kernel module into the running Linux kernel without resolving dependencies.
Term 87
An Internet gateway is a cloud networking component that provides a connection between a virtual private cloud (VPC) and the public Internet, enabling resources in the VPC to send and receive traffic to and from the Internet.
Term 88
iOS is Apple's mobile operating system that powers iPhones and iPads, providing a secure and user-friendly platform for apps and services.
Term 89
A Cisco IOS command that forwards broadcast traffic from one subnet to a specific server on another subnet, allowing devices to obtain IP configuration or other services without needing a router or server on their local network.
Term 90
IP Source Guard is a network security feature that blocks IP address spoofing by verifying that each packet's source IP address matches an authorized binding assigned to that switch port.