System Administration and Maintenance (Linux & Security)

Comprehensive vocabulary flashcards reviewing key operating system concepts, Linux kernel architectures, file systems, administration utilities, and cybersecurity terminology.

Freax

The name Linus Torvalds originally intended to give to the Linux kernel, derived from a combination of "FREE" and "X" (referencing Unix).

Monolithic Kernel

A kernel architecture where the entire kernel operates within a single address space and all basic services (such as process management, memory management, device drivers, and file systems) are part of a large, single codebase.

Btrfs

A modern Linux file system based on the copy-on-write ($\text{COW}$) principle with an integrated logical volume manager, supporting a maximum file size and volume size of $16\,\text{EB}$ and up to $2^{64}$ files.

Wayland Compositor

A display server implementing the Wayland protocol that handles communication between the display server and its clients while simultaneously performing the task of a compositing window manager.

Dandified YUM (DNF)

The next-generation package manager for RPM-based Linux distributions that succeeded YUM, introduced in Fedora $18$ as a technology preview and made the default package manager starting in Fedora $22$.

Inode

The filesystem metadata block in Unix-like operating systems that stores file permissions, ownership, file size, and pointers to the raw data blocks on the physical drive.

LAMP Stack

An acronym and collection of open-source software installed together to host dynamic websites and web applications, consisting of Linux, Apache, MySQL, and PHP.

Kea

A modern, modular DHCP server developed by the Internet Systems Consortium (ISC) to replace the deprecated isc-dhcp-server, featuring multi-threading, database-backed lease storage, and a REST API control agent.

Red-Hat Hacker

A vigilante hacker who aims to stop malicious hackers by taking matters into their own hands using aggressive tactics, such as launching counter-attacks, flooding attacker servers with DDoS attacks, or breaking in to destroy malware.

Rainbow Table Attack

A password cracking technique used against systems storing passwords as one-way cryptographic hashes, where an attacker utilizes precomputed tables of hash values to identify plaintext passwords.