Definitions and pro-tips for the 220-1101 certification.
An access point (AP) enables wireless devices to connect to a wired network using Wi-Fi protocols. It acts as a bridge, translating wireless signals to wired connections and vice versa, extending network reach without requiring direct cable connections for every device.
Bandwidth defines the data transfer capacity of a network connection, measured in bits per second (bps). It represents the maximum amount of data that can be transmitted over a connection in a given timeframe. Higher bandwidth enables faster data transfer speeds and supports more simultaneous connections.
The Basic Input/Output System (BIOS) is firmware embedded on a motherboard that initializes hardware during the boot process. It performs a power-on self-test (POST) and loads the operating system. Modern systems increasingly utilize UEFI, a more advanced successor to BIOS.
Bluetooth is a wireless technology standard enabling short-range data exchange between devices. Utilizing the 2.4 GHz ISM band, it creates personal area networks (PANs) for applications like audio streaming, file transfer, and peripheral connections with limited power consumption.
Cloud computing delivers on-demand access to computing resources—servers, storage, databases, networking, software, and analytics—over the internet. This model shifts IT infrastructure from on-premises ownership to a pay-as-you-go service, offering scalability and flexibility.
The CMOS battery is a small, coin-cell battery on the motherboard providing power to the CMOS chip. This chip retains the system’s BIOS settings, including boot order, date, and time, even when the computer is powered off, ensuring proper system startup.
A Command Line Interface is a text-based method for interacting with a computer’s operating system. Users type commands to execute tasks, offering precise control and automation capabilities. CLIs are essential for system administration, scripting, and advanced troubleshooting, bypassing graphical user interface limitations.
The Command Prompt is a text-based interface for interacting with the Windows operating system. Users enter commands to perform tasks, manage files, configure system settings, and troubleshoot issues, providing a powerful alternative to the graphical user interface.
The central processing unit (CPU) is the primary component executing instructions within a computer. It fetches, decodes, and executes program instructions, performing arithmetic, logical, control, and input/output operations. CPU performance is influenced by clock speed, core count, and cache size.
DisplayPort is a digital display interface designed primarily for connecting a video source, such as a computer, to a display device. It supports higher resolutions and refresh rates than older standards and is commonly found on high-end graphics cards and monitors, offering features like daisy-chaining.
DNS is a hierarchical and distributed naming system that translates human-readable domain names into numerical IP addresses. This translation process enables users to access online resources without memorizing complex IP addresses, forming the foundation of internet navigation.
A driver is software facilitating communication between the operating system and a hardware device. It translates OS commands into a format the device understands, and vice versa. Proper driver installation is crucial for device functionality and system stability. Incorrect drivers can cause conflicts or failures.
A Dynamic IP Address is a temporary numerical label automatically assigned to a network device by a Dynamic Host Configuration Protocol (DHCP) server. These addresses are leased for a specific duration and can change upon lease renewal, simplifying network administration.
eMMC (embedded MultiMediaCard) is a flash storage solution commonly found in budget-friendly devices like smartphones, tablets, and Chromebooks. It integrates flash memory and a memory controller into a single chip, providing a compact and cost-effective storage option.
Encryption is a data security process transforming readable data (plaintext) into an unreadable format (ciphertext) using an algorithm and a key. This protects confidentiality during storage and transmission. Decryption reverses the process, requiring the correct key to restore the original data.
Electrostatic Discharge is the rapid transfer of electrical charge between objects with differing static electricity potentials. This can damage sensitive electronic components, even with voltages below what humans can feel, causing immediate failure or latent defects.
ESD Safe Packaging utilizes materials designed to prevent damage to sensitive electronic components caused by electrostatic discharge (ESD). These materials dissipate static electricity, protecting components from potentially destructive voltage spikes during handling and storage.
An expansion slot is a socket on the motherboard that allows for the addition of expansion cards, enhancing a computer’s capabilities. These slots provide connectivity for components like graphics cards, sound cards, and network adapters, extending the system’s functionality.
A firewall is a network security device, either hardware or software, that controls network traffic based on a defined set of rules. It examines incoming and outgoing packets, blocking or allowing them based on source, destination, port, and protocol to protect against unauthorized access.
Firmware is a specific type of software embedded directly into hardware components. It provides essential, low-level instructions that control the device’s basic functions. Unlike operating systems, firmware is typically non-volatile memory and persists even without power, initializing hardware during startup.
A flash drive is a portable data storage device utilizing solid-state flash memory. It connects to computers via USB, providing a convenient method for transferring files, creating backups, and booting operating systems. Flash drives offer durability and compact size.
Form Factor defines the physical dimensions, shape, and layout of computer components. Standardization ensures compatibility between components like motherboards, power supplies, and cases, allowing for proper installation and airflow within a system.
A graphics processing unit (GPU) is a specialized electronic circuit designed to accelerate image rendering. GPUs excel at parallel processing, making them ideal for tasks like gaming, video editing, and machine learning. They offload graphics processing from the CPU, improving overall system performance.
Graphical User Interface enables user interaction with a computer through visual elements like icons and windows. It simplifies operation by replacing complex commands with intuitive graphical representations, improving accessibility for non-technical users and streamlining common tasks.
A Hard Disk Drive (HDD) is a traditional storage device employing magnetic platters to store and retrieve digital data. Data access relies on mechanical components, resulting in slower speeds compared to SSDs. Common form factors include 3.5-inch (desktop) and 2.5-inch (laptop).
High-Definition Multimedia Interface is a digital audio/video interface transmitting uncompressed video and compressed/uncompressed audio. It’s the standard connection for modern televisions, monitors, and gaming consoles, offering high bandwidth for superior image and sound quality. It supports HDCP copy protection.
A heatsink is a passive cooling device that dissipates heat generated by electronic components. Typically made of aluminum or copper, it transfers heat away from the component to a surrounding medium, usually air. Fins increase the surface area for more efficient heat transfer.
An Internet Protocol (IP) address is a numerical label assigned to each device connected to a computer network utilizing the Internet Protocol. It enables logical identification and location addressing for communication between devices across networks, facilitating data transmission.
Latency measures the delay between a request for data and its actual delivery. It represents the time it takes for a packet to travel from source to destination. Lower latency results in faster response times and improved application performance, particularly for real-time applications.
The Lightning connector is a proprietary 8-pin connector designed by Apple Inc. for use with iPhones, iPads, and iPods. It replaced the 30-pin Dock connector, offering a smaller, reversible design and supporting both data transfer and power charging capabilities. It is now being phased out in favor of USB-C.
The loopback address, typically 127.0.0.1, is a special IPv4 address reserved for testing the TCP/IP protocol stack on a local machine. It allows software to communicate with itself without utilizing physical network interfaces, verifying network configuration.
A Media Access Control (MAC) address is a unique 48-bit identifier assigned to a network interface card (NIC) by its manufacturer. It functions as a physical address used for communication within a local network segment, operating at Layer 2 of the OSI model.
Malware encompasses malicious software designed to disrupt, damage, or gain unauthorized access to a computer system. This includes viruses, worms, Trojans, ransomware, spyware, and adware, each employing different methods to compromise security and data integrity.
The motherboard is the central printed circuit board connecting a computer’s core components. It provides pathways for communication between the CPU, memory, storage, and peripherals. Form factor dictates size and compatibility, influencing case selection and expansion options.
Mean Time Between Failures is a statistical measure of a device’s reliability, representing the average time a non-repairable system is expected to operate before a failure occurs. It’s calculated based on extensive testing and provides an indication of component quality and durability.
MFA enhances security by requiring verification from multiple independent authentication factors. These factors typically include knowledge (password), possession (security token), or inherence (biometrics), significantly reducing the risk of unauthorized access from compromised credentials.
A Network Interface Card (NIC) is a hardware component enabling a device to connect to a network. It manages data transmission between the device and the network medium, utilizing a unique MAC address for identification. NICs support various network standards and physical cabling types for connectivity.
Network topology defines the physical or logical arrangement of network devices and connections. Common topologies include bus, star, ring, and mesh, each offering different levels of redundancy, scalability, and cost-effectiveness depending on network requirements.
Near Field Communication (NFC) is a short-range, high-frequency wireless communication technology enabling device-to-device data transfer within approximately 4 centimeters. It facilitates contactless payments, data exchange, and quick pairing by utilizing magnetic field induction.
Non-Volatile Memory Express is a high-performance interface protocol designed specifically for SSDs. Utilizing the PCIe bus, NVMe significantly reduces latency and increases data transfer speeds compared to older SATA interfaces, resulting in faster boot times and application loading.
An Operating System (OS) is system software that manages computer hardware and software resources. It provides essential services like process management, memory allocation, file system navigation, and device control, acting as an intermediary between applications and the hardware.
An optical drive utilizes lasers to read and write data on optical media like CDs, DVDs, and Blu-ray discs. These drives are commonly used for software installation, data backups, and media playback, offering varying storage capacities based on the disc format.
A peripheral device connects to a computer system to provide input, output, or auxiliary functions. These external devices expand the computer’s capabilities beyond its core processing functions. Examples include keyboards, mice, printers, storage devices, and cameras.
Phishing is a social engineering technique where attackers deceive individuals into revealing sensitive information—usernames, passwords, credit card details—through fraudulent communications. These communications often mimic legitimate organizations and exploit trust to compromise security.
Power over Ethernet (PoE) is a technology that delivers electrical power through standard Ethernet cables alongside data. This allows devices like IP cameras, VoIP phones, and wireless access points to receive both power and data connectivity from a single cable.
Power-On Self-Test is the initial diagnostic sequence executed by a computer’s BIOS or UEFI firmware upon startup. It verifies essential hardware components like CPU, memory, and storage before loading the operating system, reporting errors if failures are detected.
The Power Supply Unit (PSU) converts AC power from the wall outlet into DC power usable by computer components. Wattage indicates the total power output, while efficiency ratings (80+ Bronze, Gold, Platinum) reflect energy conservation. Modular PSUs allow for selective cable connections.
Random Access Memory (RAM) is volatile memory used for actively processing data. It allows rapid read and write access to any location, enabling quick application loading and multitasking. Capacity and speed (measured in MHz) significantly impact system performance.
Radio-Frequency Identification (RFID) employs electromagnetic fields to automatically identify and track tags attached to objects. These tags contain electronically stored information, allowing for non-contact reading and identification in various applications, including inventory management and supply chain tracking.
RJ-11 is a standardized physical interface used primarily for telephone connections and legacy modem connections. It utilizes a six or four-position, two-conductor modular connector. While resembling RJ-45, it is incompatible and transmits analog signals, not digital Ethernet data.
RJ-45 is a standardized 8-pin/8-position modular connector commonly used for Ethernet network connections. It facilitates data transmission over twisted-pair cabling, enabling devices to connect to local area networks (LANs) and the internet. Proper crimping is essential for reliable connectivity.
A router is a networking device that forwards data packets between computer networks. Operating at Layer 3 (Network Layer) of the OSI model, it uses IP addresses to determine the best path for data transmission, enabling communication between different networks, including LANs and the WAN.
Self-Monitoring, Analysis and Reporting Technology is a system built into hard drives and SSDs that monitors drive health and predicts potential failures. It tracks attributes like read error rate and spin-up time, providing early warnings of impending issues to allow for data backup and drive replacement.
A Serial Port is a communication interface used to transmit data one bit at a time. Historically used for connecting peripherals like modems and mice, it’s now often found in specialized equipment and legacy systems, identified by designations like COM1 or COM2.
A Small Office/Home Office (SOHO) network is a typical network setup for small businesses and residential use. These networks commonly utilize all-in-one devices like routers that integrate switching, routing, and wireless access point functionalities into a single unit.
A Solid State Drive (SSD) is a data storage device utilizing flash memory to store persistent data. SSDs offer significantly faster read/write speeds, lower latency, and increased durability compared to traditional Hard Disk Drives (HDDs) due to the absence of moving mechanical parts.
A Solid State Drive (SSD) is a storage device utilizing flash memory to persistently store data. Offering faster access times and increased durability compared to HDDs, SSDs improve system responsiveness and boot times. NVMe SSDs provide significantly higher speeds than SATA SSDs.
Static electricity is the result of an imbalance of electrical charges on a surface. This buildup can discharge unexpectedly, generating electromagnetic interference capable of damaging delicate electronic components. Proper grounding and anti-static measures are crucial during computer repair.
A Static IP Address is a permanently assigned numerical label to a network device, manually configured and remaining constant unless changed. This contrasts with dynamic addresses, providing consistent network access for servers, printers, and other critical infrastructure.
A network switch is a Layer 2 device that forwards data packets between devices on a network. Utilizing MAC addresses, it learns and maintains a forwarding table to efficiently direct traffic only to the intended recipient, improving network performance and security compared to hubs.
Thermal paste, also known as thermal grease, is a thermally conductive compound applied between a heat source (like a CPU) and a heatsink. It fills microscopic gaps, improving heat transfer efficiency by eliminating air pockets, which are poor conductors of heat.
Thunderbolt is a high-speed hardware interface co-developed by Intel and Apple, enabling the connection of external devices. Utilizing a USB-C connector in recent iterations, it combines PCI Express and DisplayPort protocols for data, video, and power delivery, offering significantly faster transfer rates.
Troubleshooting methodology is a systematic, logical process for identifying and resolving technical issues. It involves defining the problem, creating a hypothesis, testing the hypothesis, implementing a solution, and verifying the resolution. A structured approach minimizes wasted time and ensures effective problem-solving.
Unified Extensible Firmware Interface is a modern firmware interface replacing BIOS. It initializes hardware and loads the operating system. UEFI supports Secure Boot, larger hard drives exceeding 2TB, and faster boot times through improved initialization processes and standardized drivers.
Uninterruptible Power Supply provides temporary power when the primary power source is lost. It protects hardware from damage and prevents data loss by allowing a safe shutdown. UPS units vary in capacity and topology, impacting their suitability for different workloads.
Universal Serial Bus is an industry standard for connecting devices to a computer. It defines cables, connectors, and communication protocols for data transfer and power delivery. USB standards have evolved, increasing data transfer speeds and power output capabilities over time, impacting peripheral compatibility.
Video Graphics Array (VGA) is an analog video display standard. It transmits video signals using a 15-pin D-sub connector. While largely superseded by digital standards like HDMI and DisplayPort, VGA remains relevant for compatibility with older hardware and troubleshooting legacy systems.
A Virtual Private Network establishes a secure, encrypted connection over a less secure network, typically the internet. It creates a private network tunnel, protecting data confidentiality and integrity. VPNs mask the user’s IP address, providing enhanced privacy and secure remote access to resources.
Virtualization creates software-based versions of physical resources like servers, operating systems, or storage devices. This allows multiple operating systems to run concurrently on a single physical machine, improving resource utilization and reducing hardware costs. It’s a core component of modern IT infrastructure.
A VPN establishes an encrypted tunnel over a public network, enabling secure remote access to resources and protecting data confidentiality. It masks the user’s IP address, providing privacy and bypassing geographical restrictions by routing internet traffic through a remote server.
Voltage Regulator Module is a circuit that provides stable voltage to the CPU and other components. It converts the power supply’s DC voltage into the lower, precise voltages required by the processor, ensuring consistent and reliable operation.
Wireless Security Protocols are standards designed to protect wireless network communications. These include WEP, WPA, WPA2, and WPA3, each offering varying levels of encryption and authentication. Newer protocols provide stronger security against unauthorized access and data interception.
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