Term 181
Disaster recovery
Disaster recovery is a set of policies, procedures, and tools that help an organization restore critical IT systems and data after a disruptive event.
Acronym study
Terms 181–210 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 181
Disaster recovery is a set of policies, procedures, and tools that help an organization restore critical IT systems and data after a disruptive event.
Term 182
Disk encryption is the process of converting data on a storage device into a coded form that can only be read with the correct decryption key, protecting it from unauthorized access.
Term 183
Disk Management is a system utility that lets you manage hard drives and other storage devices, including partitioning, formatting, and assigning drive letters.
Term 184
A DLL error is a message that appears when a Windows program cannot find or properly use a Dynamic Link Library file it needs to run.
Term 185
dmesg is a Linux command that displays messages from the kernel ring buffer, used to diagnose hardware and boot issues.
Term 186
DNS is the system that translates human-friendly domain names like example.com into machine-readable IP addresses so computers can find each other on a network.
Term 187
A DNS log is a record of all Domain Name System queries and responses that pass through a server, providing a trail of which domains were requested, by whom, and when.
Term 188
DNS poisoning is a cyberattack that corrupts a DNS resolver's cache with false information, redirecting users to malicious websites without their knowledge.
Term 189
A DNS record is a set of instructions stored on a DNS server that tells clients how to interact with a domain, most commonly by mapping a human-readable domain name to an IP address.
Term 190
A DNS zone is a distinct part of the global Domain Name System (DNS) namespace that is delegated to a specific administrator or organization for management, containing resource records for a domain.
Term 191
A docking station is a hardware device that lets you connect a laptop to multiple peripherals like monitors, keyboards, and mice through a single connection point.
Term 192
Amazon DocumentDB is a fully managed, MongoDB-compatible document database service that stores, queries, and indexes JSON-like data for scalable applications.
Term 193
The Domain Name System (DNS) is the internet's phonebook that translates human-friendly domain names like google.com into computer-friendly IP addresses like 172.217.0.46.
Term 194
DMARC is an email authentication protocol that helps prevent spoofing and phishing by verifying that incoming email really comes from the domain it claims to be from and tells receiving servers what to do if verification fails.
Term 195
DomainKeys Identified Mail is an email authentication method that allows a domain to cryptographically sign its outgoing messages so receiving servers can verify the sender's domain is legitimate and the message was not tampered with.
Term 196
Double Data Rate (DDR) is a technology that doubles the data transfer rate of a memory or bus by sending data on both the rising and falling edges of the clock signal, effectively doing twice as much work per clock cycle.
Term 197
Drive wiping is the process of completely and permanently erasing all data on a storage drive so that it cannot be recovered.
Term 198
Driver rollback is a Windows tool that reverts a device driver to its previous version to fix problems caused by a recent driver update.
Term 199
DSL (Digital Subscriber Line) is a technology that uses existing telephone lines to provide high-speed internet access without interrupting your phone service.
Term 200
du is a command-line tool used in Unix-like operating systems to estimate and display the disk space used by files and directories.
Term 201
A Dual In-line Memory Module (DIMM) is a small circuit board that holds memory chips and plugs into a computer's motherboard to provide Random Access Memory (RAM).
Term 202
Dumpster diving is the practice of searching through trash to find discarded information or equipment that can be used to compromise security.
Term 203
A duplex mismatch occurs when two connected network devices are configured with different duplex settings (one half-duplex, one full-duplex), leading to poor performance and data errors.
Term 204
A hardware component in a printer that automatically flips paper to print on both sides.
Term 205
Dynamic ARP Inspection is a security feature that validates ARP packets on a network to prevent man-in-the-middle attacks by ensuring that only legitimate ARP messages are forwarded.
Term 206
DHCP is a network protocol that automatically assigns IP addresses and other configuration settings to devices so they can communicate on a network.
Term 207
Dynamic NAT is a method of mapping multiple private IP addresses to a pool of public IP addresses automatically, allowing many devices to share a limited number of public addresses.
Term 208
A route that is automatically learned and updated by a router using a routing protocol, rather than being manually configured.
Term 209
DynamoDB Streams is a feature that captures a time-ordered sequence of item-level changes (inserts, updates, deletes) in a DynamoDB table and makes them available for processing or replication.
Term 210
EBS encryption is a security feature that automatically encrypts data stored on Amazon Elastic Block Store volumes, protecting it at rest and in transit between the volume and the attached EC2 instance.