Term 631
Toner probe
A toner probe is a two-part tool used in networking to trace and identify specific cables within a bundle of wires, often by sending an audio signal down the wire and detecting it with a wand.
Acronym study
Terms 631–660 of 716 CCNA 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 631
A toner probe is a two-part tool used in networking to trace and identify specific cables within a bundle of wires, often by sending an audio signal down the wire and detecting it with a wand.
Term 632
Traceroute is a network diagnostic tool that maps the route data packets take from your computer to a destination, showing each intermediate hop and the time taken.
Term 633
A traffic manager is a networking device or service that directs incoming data traffic across multiple servers or links to balance load, improve performance, and ensure availability.
Term 634
Traffic shaping is a network bandwidth management technique that controls the flow of data packets to ensure smooth performance and prevent congestion by intentionally delaying some traffic.
Term 635
A Transit Gateway is a network hub that connects multiple virtual private clouds (VPCs) and on-premises networks through a single, central gateway to simplify routing and reduce complexity.
Term 636
TFTP is a simple, lightweight protocol used to transfer files between devices on a network without the security and error-checking features of more robust file transfer methods.
Term 637
A trunk port is a switch port configured to carry traffic for multiple VLANs, using a tagging protocol to identify which VLAN each frame belongs to.
Term 638
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 639
TTL (Time to Live) is a field in IP packets that limits the number of hops a packet can traverse before being discarded.
Term 640
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 641
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 642
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 643
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 644
A device that provides emergency power to connected equipment when the main power source fails or drops to an unacceptable voltage level.
Term 645
uniq is a Unix/Linux command that filters out adjacent duplicate lines from a sorted or unsorted text file or input stream, reporting only unique occurrences.
Term 646
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 647
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 648
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 649
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 650
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 651
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 652
Unshielded Twisted Pair (UTP) is a copper cabling type with pairs of twisted wires and no shielding, used for Ethernet networks.
Term 653
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 654
A variable is a named storage location in a computer program that holds a value which can change during execution.
Term 655
Violation mode is a port security feature on Cisco switches that defines what action is taken when an unauthorized device attempts to connect to a secured switch port.
Term 656
A Virtual IP Address (VIP) is a logical IP address shared among multiple devices to provide high availability and load balancing.
Term 657
Virtual Extensible LAN (VXLAN) is a network virtualization technology that uses encapsulation to create isolated, scalable, Layer 2 networks across a Layer 3 infrastructure.
Term 658
A Virtual IP (VIP) is a floating IP address shared among multiple servers or network devices to provide high availability and fault tolerance without being tied to a single physical interface.
Term 659
A virtual network is a software-based network that connects computers, servers, and devices over the internet or within a cloud environment, simulating a physical network without requiring dedicated hardware.
Term 660
Virtual Routing and Forwarding (VRF) is a technology that lets a single physical router operate as if it were multiple independent routers, each keeping its own separate routing table.