Term 931
TTL
TTL (Time to Live) is a value in network packets that limits how many hops or seconds the packet can travel before being discarded, preventing infinite loops and network congestion.
Acronym study
Terms 931–960 of 1033 N10-009 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 931
TTL (Time to Live) is a value in network packets that limits how many hops or seconds the packet can travel before being discarded, preventing infinite loops and network congestion.
Term 932
TTL (Time to Live) is a field in IP packets that limits the number of hops a packet can traverse before being discarded.
Term 933
Twisted Nematic (TN) is a type of liquid crystal display (LCD) technology that uses liquid crystals twisted at a 90-degree angle to control light and create images on a screen.
Term 934
TX (Transmitter) is the component or port in a network device that sends data signals onto a transmission medium.
Term 935
TX (Transmit/Transmitter) is the signal path that sends data from a device to another device or network medium.
Term 936
A TXT record is a type of DNS record that stores text information for a domain, commonly used for verification, email security, and policy purposes.
Term 937
A Type 1 hypervisor is a lightweight operating system that runs directly on server hardware to create and manage virtual machines without needing a separate host OS.
Term 938
A Type 2 hypervisor is software that creates and runs virtual machines on top of a host operating system, rather than directly on the hardware.
Term 939
udev is a device manager for the Linux kernel that dynamically manages device nodes in the /dev directory, handling device insertion, removal, and event-driven configuration.
Term 940
UDP (User Datagram Protocol) is a communication protocol that sends data quickly without first checking if the receiver is ready or if the data arrived correctly.
Term 941
UDR is a user-defined routing rule that controls how network traffic moves between subnets or to external destinations in a cloud or on-premises environment.
Term 942
UEFI (Unified Extensible Firmware Interface) is a modern firmware interface that initializes hardware and boots the operating system, replacing the older BIOS.
Term 943
UEFI is the modern replacement for BIOS that controls how a computer starts up and loads the operating system.
Term 944
A Uniform Resource Locator (URL) is the web address you type into a browser to access a specific resource like a webpage, image, or file on the internet.
Term 945
A device that provides emergency power to connected equipment when the main power source fails or drops to an unacceptable voltage level.
Term 946
Universal Plug and Play is a set of networking protocols that allows devices on a network to discover each other and connect automatically without manual configuration.
Term 947
A Universal Serial Bus (USB) is a standard interface that allows you to connect devices like keyboards, mice, storage drives, and printers to a computer for data transfer and power delivery.
Term 948
A small, reversible 24-pin USB connector that supports high-speed data transfer, power delivery, and video output, used in modern devices.
Term 949
An unknown unicast is a frame sent to a switch that is destined for a MAC address the switch does not have in its MAC address table.
Term 950
Unshielded Twisted Pair (UTP) is a type of copper cabling used in Ethernet networks, where pairs of wires are twisted together to reduce electrical interference, without additional metallic shielding.
Term 951
A UPS (Uninterruptible Power Supply) provides emergency backup power to connected equipment when the main power fails, protecting against data loss and hardware damage.
Term 952
A URL is a string of characters that identifies the location and method to access a resource on the internet.
Term 953
Usable hosts are the IP addresses in a subnet that can actually be assigned to devices like computers, printers, or servers, excluding the network and broadcast addresses.
Term 954
USB (Universal Serial Bus) is a standard for connecting peripherals to a host computer, supporting data transfer and power delivery.
Term 955
User Datagram Protocol (UDP) is a fast, connectionless network protocol that sends data without first checking if the receiver is ready or if the data arrived safely.
Term 956
A user-defined route (UDR) is a custom routing rule you create in a cloud or on-premises network to override or supplement the system's default routing behavior, directing network traffic along a specific path.
Term 957
Unified Threat Management (UTM) is a comprehensive security appliance that combines multiple security functions like firewall, antivirus, intrusion prevention, and VPN into a single device.
Term 958
Unshielded Twisted Pair (UTP) is a copper cabling type with pairs of twisted wires and no shielding, used for Ethernet networks.
Term 959
A Variable Length Subnet Mask (VLSM) allows network engineers to divide an IP address space into subnets of different sizes, using different subnet masks for each subnet to match the exact number of hosts needed.
Term 960
Virtual Desktop Infrastructure (VDI) is a technology that hosts desktop operating systems on a central server so users can access their personal desktop environment from any device.