Term 121
Rapid Security Response
A Rapid Security Response is an emergency software patch from Apple that fixes critical security flaws in iOS, iPadOS, macOS, and other Apple operating systems without requiring a full system update.
Acronym study
Terms 121–150 of 189 220-1101 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 121
A Rapid Security Response is an emergency software patch from Apple that fixes critical security flaws in iOS, iPadOS, macOS, and other Apple operating systems without requiring a full system update.
Term 122
Red-Green-Blue (RGB) is a color model that combines red, green, and blue light to create a wide range of colors, primarily used in digital displays and imaging systems.
Term 123
A technology that combines multiple physical hard drives into a single logical unit to improve performance, reliability, or both.
Term 124
A modular connector standard used for Ethernet cabling, commonly known as the 8P8C connector with a specific wiring pattern for structured network wiring.
Term 125
An RJ45 connector is the clear plastic plug at the end of an Ethernet cable that connects computers, routers, and switches to form a wired network.
Term 126
RADIUS is a network protocol that provides centralized authentication, authorization, and accounting for users trying to connect to a network service.
Term 127
Remote Desktop Protocol is a technology that lets you connect to and control another computer from a different location, as if you were sitting in front of it.
Term 128
Remote Monitoring and Management (RMM) is a technology that allows IT professionals to monitor, manage, and maintain computer systems and networks from a distant location without being physically present.
Term 129
Resilient File System (ReFS) is a Microsoft file system designed to maximize data availability, resist corruption, and handle large volumes of data efficiently.
Term 130
Revolutions Per Minute (RPM) measures how many full rotations a spinning component, such as a hard drive platter or a cooling fan, completes in one minute.
Term 131
RISC is a CPU design philosophy that uses a small, highly optimized set of instructions to execute operations quickly and efficiently.
Term 132
A safety data sheet (SDS) is a document that lists the hazards, handling, storage, and emergency procedures for a chemical substance, required in workplaces including IT environments.
Term 133
Secure Digital (SD) is a small, removable flash memory card used to store data in devices like cameras, smartphones, and laptops.
Term 134
Secure Shell (SSH) is a network protocol that provides a secure, encrypted way to access and manage remote computers over an unsecured network.
Term 135
Secure Sockets Layer is a cryptographic protocol that encrypts data transmitted between a web browser and a server to protect it from eavesdropping and tampering.
Term 136
Self-monitoring Analysis and Reporting Technology (SMART) is a monitoring system built into hard drives and solid-state drives that detects and reports on various indicators of drive reliability to predict potential failures before they occur.
Term 137
Sender Policy Framework (SPF) is an email authentication method that prevents spammers from sending emails that appear to come from your domain by listing which servers are allowed to send email for that domain.
Term 138
Serial Advanced Technology Attachment (SATA) is a computer bus interface used to connect storage devices like hard drives and solid-state drives to a computer's motherboard.
Term 139
Serial Attached SCSI (SAS) is a fast, reliable interface used to connect and transfer data between hard drives or SSDs and a computer system, commonly found in enterprise servers.
Term 140
A 9-pin D-shaped connector used for serial communication between devices like computers, modems, and networking equipment.
Term 141
A service level agreement (SLA) is a documented contract that defines the specific level of service a provider guarantees to a customer, including performance metrics, responsibilities, and remedies for failures.
Term 142
A Service Set Identifier (SSID) is the public name of a Wi-Fi network that devices use to identify and connect to it.
Term 143
SFTP (Secure File Transfer Protocol) is a network protocol that provides secure file transfer over SSH, encrypting both commands and data.
Term 144
Short Message Service (SMS) is a text messaging service that allows short messages to be sent between mobile phones, pagers, and other devices using standardized communication protocols.
Term 145
A SIM (Subscriber Identity Module) is a smart card that securely stores the international mobile subscriber identity (IMSI) and related key used to identify and authenticate a subscriber on mobile networks.
Term 146
Simple Mail Transfer Protocol (SMTP) is the standard internet protocol used for sending and relaying email messages from a client to a server or between servers.
Term 147
Small Computer System Interface (SCSI) is a set of standards for connecting and transferring data between computers and peripheral devices like hard drives, scanners, and tape drives.
Term 148
A compact version of a standard RAM stick, mainly used in laptops and small form factor computers to provide system memory.
Term 149
SMB is a network file-sharing protocol that allows applications to read, write, and request services from server programs in a computer network.
Term 150
Software as a Service (SaaS) is a cloud computing model where users access software applications over the internet on a subscription basis, without installing or maintaining the software locally.