Term 151
Cyclic Redundancy Check
A Cyclic Redundancy Check (CRC) is an error-detecting code used to verify that data transmitted over a network or stored on a device has not been corrupted.
Acronym study
Terms 151–180 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 151
A Cyclic Redundancy Check (CRC) is an error-detecting code used to verify that data transmitted over a network or stored on a device has not been corrupted.
Term 152
A Data Center Interconnect is a network connection that links two or more separate data centers together so they can share data, resources, and services as if they were a single facility.
Term 153
Data classification is the process of organizing data into categories based on its sensitivity, value, and criticality to an organization, so that appropriate security controls can be applied.
Term 154
A Data Lifecycle Manager is a system or set of policies that automates the movement, protection, retention, and deletion of data from creation to disposal, ensuring compliance and efficient storage usage.
Term 155
A Data VLAN is a virtual local area network configured on a switch to carry user-generated traffic, separating it from management, voice, or other types of network traffic.
Term 156
DAX (DynamoDB Accelerator) is a fully managed, highly available, in-memory cache for Amazon DynamoDB that provides microsecond read latency.
Term 157
A DC jack is the small, round power port on a laptop or other mobile device where you plug in the power adapter to charge the battery or run the device.
Term 158
A dead-letter queue is a secondary queue that stores messages that a primary queue or processing system cannot successfully process, allowing for later analysis and reprocessing.
Term 159
Decapsulation is the process in networking where a device removes headers and trailers from a data packet as it travels up the OSI model layers.
Term 160
A Dedicated Interconnect is a direct, private physical connection between your on-premises network and a cloud provider's network, bypassing the public internet for faster, more reliable, and more secure data transfer.
Term 161
A default app is the program that your operating system automatically uses to open a specific type of file or perform a certain task, such as opening a web link or viewing a photo.
Term 162
A default gateway is a network device, typically a router, that acts as the exit point for traffic from a local network to other networks, including the internet.
Term 163
A default route is a catch-all routing entry that tells a network device where to send packets when no specific route matches the destination address.
Term 164
The Default VLAN is VLAN 1 on most Cisco switches and it is the VLAN to which all switch ports belong by default until they are assigned to a different VLAN.
Term 165
A router elected in an OSPF multi-access network to manage link-state updates and reduce routing protocol traffic.
Term 166
Device Manager is a built-in Windows tool that shows you all the hardware connected to your computer and lets you manage the drivers that make that hardware work.
Term 167
The df command in Linux and Unix systems reports the amount of disk space used and available on mounted file systems.
Term 168
Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses and network settings to devices on a network, so they can communicate without manual configuration.
Term 169
A DHCP pool is a reserved set of IP addresses that a DHCP server can assign to devices on a network automatically when they request a connection.
Term 170
A network device or feature that forwards DHCP broadcast messages between clients and servers on different subnets so that IP address assignment works across multiple network segments without a separate DHCP server on each one.
Term 171
A DHCP server is a network device or service that automatically assigns IP addresses and other network configuration parameters to devices on a network, eliminating the need for manual configuration.
Term 172
DHCP snooping is a network security feature that filters untrusted DHCP messages to prevent rogue DHCP servers from giving out false IP addresses.
Term 173
A differential backup copies all data that has changed since the last full backup, growing in size with each new backup until the next full backup is performed.
Term 174
Digital Rights Management (DRM) is a set of technologies used to control how digital content like music, movies, ebooks, or software is accessed, copied, or shared.
Term 175
Digital Subscriber Line (DSL) is a technology that uses ordinary copper telephone wires to provide high-speed internet access to homes and businesses.
Term 176
Digital Visual Interface is a video display interface used to connect a video source, like a computer, to a monitor or projector, transmitting uncompressed digital video signals for clear, high-quality images.
Term 177
A digitizer is the part of a touchscreen that converts your finger or stylus touches into digital signals the device can understand.
Term 178
Direct Attach Copper is a type of high-speed copper cable used to connect networking equipment over short distances without needing separate transceivers.
Term 179
AWS Direct Connect is a cloud service that lets you create a dedicated private network link from your on-premises data center to AWS, bypassing the public internet for more consistent and secure connectivity.
Term 180
Direct-attached Storage (DAS) is a storage device connected directly to a computer or server without going through a network.