Term 481
NFC
Near Field Communication is a short-range wireless technology that lets two devices exchange data when they are held close together, typically within a few centimeters.
Acronym study
Terms 481–510 of 826 220-1201 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 481
Near Field Communication is a short-range wireless technology that lets two devices exchange data when they are held close together, typically within a few centimeters.
Term 482
Network File System (NFS) is a protocol that allows a computer to access files over a network as if they were on its own local hard drive.
Term 483
nmcli is a command-line tool used in Linux to manage network connections, devices, and settings through NetworkManager.
Term 484
Non-volatile Memory Express (NVMe) is a high-speed interface protocol that connects storage devices like SSDs directly to the CPU for much faster data transfer than older technologies like SATA.
Term 485
An NSG rule is a set of security rules in Microsoft Azure that controls whether network traffic is allowed or denied to and from Azure resources.
Term 486
A numbered ACL is an access control list on a router or firewall that uses a number to identify the list and define rules for permitting or denying traffic based on source and destination IP addresses, ports, and protocols.
Term 487
NVMe (Non-Volatile Memory Express) is a high-speed storage protocol that allows solid-state drives to communicate directly with a computer's CPU, dramatically improving data transfer speeds compared to older storage interfaces.
Term 488
Offline files are copies of network files stored locally on a device so they remain accessible even when the network is unavailable.
Term 489
An OLED display is a screen technology that uses organic compounds to emit light when an electric current is applied, enabling thinner, more vibrant, and energy-efficient screens for mobile devices.
Term 490
On-demand capacity is the ability to instantly add or remove computing resources like storage or processing power as needed, paying only for what you use.
Term 491
A one-time password is a temporary, single-use code that authenticates a user for one login session or transaction.
Term 492
OneDrive is Microsoft’s cloud storage service that lets you store, sync, and share files online across devices.
Term 493
The Open Systems Interconnection (OSI) model is a conceptual framework used to understand how data travels from one computer to another across a network.
Term 494
An optical drive is a hardware component that reads and writes data on optical discs like CDs, DVDs, and Blu-ray discs using a laser beam.
Term 495
An Optical Network Terminal (ONT) is a device that connects your home or office to the internet service provider's fiber optic network, converting light signals into electrical signals your devices can use.
Term 496
An Organic Light-emitting Diode (OLED) is a display technology that uses organic compounds to emit light when an electric current passes through them, enabling thin, flexible, and energy-efficient screens with high contrast.
Term 497
Origin access control is a security mechanism that restricts access to a network, system, or resource based on the verified identity or attributes of the requesting entity.
Term 498
An Original Equipment Manufacturer (OEM) is a company that produces hardware components or complete systems that are sold under another company's brand name.
Term 499
The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven distinct layers, from physical hardware to application software.
Term 500
OSPF is a link-state routing protocol used to find the best path for data packets to travel across IP networks, like a smart GPS that recalculates routes when traffic changes.
Term 501
An OSPF adjacency is a logical neighbor relationship formed between two OSPF routers that have completed a series of hello and database exchange processes, enabling them to share routing information and maintain a consistent view of the network topology.
Term 502
An OSPF area is a logical grouping of routers and networks within an OSPF routing domain, used to control routing traffic and improve scalability.
Term 503
OSPF authentication is a security mechanism that verifies the identity of routers exchanging routing information within an OSPF network, preventing unauthorized or malicious routing updates.
Term 504
OSPF cost is a metric used by the Open Shortest Path First routing protocol to determine the best path for data packets to travel through a network, based on the characteristics of each link.
Term 505
OSPF metric is a cost value assigned to each route in an Open Shortest Path First network, used to determine the best path for data packets.
Term 506
An OSPF neighbor is another router that has been directly discovered through OSPF Hello packets and is willing to exchange routing information to build a network topology map.
Term 507
OSPF network type defines how the Open Shortest Path First routing protocol operates on a given interface, determining neighbor discovery, adjacency formation, and the election of designated routers.
Term 508
Out-of-band refers to a separate, dedicated network path used for managing and configuring IT devices, distinct from the main data traffic path.
Term 509
An Outbound ACL is a set of rules applied to traffic leaving a network interface that decides which packets are allowed to exit and which are blocked.
Term 510
An output device is any piece of computer hardware that displays, prints, or otherwise conveys information from a computer to a user.