Term 121
Covert channel
A covert channel is a hidden communication path that allows data to be transferred in ways that violate a system's security policy, often by using resources not intended for communication.
Acronym study
Terms 121–150 of 595 Google PCA 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 121
A covert channel is a hidden communication path that allows data to be transferred in ways that violate a system's security policy, often by using resources not intended for communication.
Term 122
A crimper is a handheld tool used to attach a connector, like an RJ45 plug, to the end of a network cable by compressing metal pins into the cable's wires to create a secure and conductive connection.
Term 123
Cross-Region Replication is the automated copying of data from a storage bucket in one geographic region to a bucket in a different geographic region for disaster recovery, compliance, or lower latency access.
Term 124
A crossover cable is an Ethernet cable with reversed transmit and receive wire pairs, used to directly connect two similar devices without a switch or hub.
Term 125
Carrier Sense Multiple Access with Collision Detection is a network protocol used in Ethernet to manage data transmission and handle collisions when two devices send data at the same time.
Term 126
curl is a command-line tool that lets you transfer data to or from a server using various network protocols, commonly used to test APIs and download files.
Term 127
A virtual machine configuration where users manually select CPU, memory, and other resources rather than using a predefined template.
Term 128
A custom role is a user-defined set of permissions in Google Cloud that you can tailor to fit specific job functions beyond the predefined roles.
Term 129
A virtual machine extension for Azure that downloads and runs scripts on a VM after it is deployed, used for configuration, software installation, and post-deployment tasks.
Term 130
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 131
Data is raw, unprocessed information, like numbers, words, or measurements, that can be stored, processed, and analyzed by computers.
Term 132
A data catalog is a centralized inventory of data assets that helps people find, understand, and trust the data they need for analytics or business decisions.
Term 133
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 134
A data lake is a centralized storage repository that holds vast amounts of raw data in its native format until it is needed for analysis.
Term 135
A data lakehouse is a modern data architecture that combines the flexibility of a data lake with the reliability and performance of a data warehouse on a single platform.
Term 136
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 137
A data warehouse is a central repository that stores large amounts of structured data from multiple sources, optimized for querying and analysis rather than day-to-day transactions.
Term 138
Dataflow is a Google Cloud managed service that processes and transforms data in real-time or batch mode using Apache Beam pipelines.
Term 139
Dataproc is a managed cloud service for running Apache Spark and Apache Hadoop clusters, allowing you to process large datasets quickly and economically.
Term 140
A datastream is a continuous, ordered flow of data that is generated and transmitted from a source to a destination for real-time processing or analysis.
Term 141
DAX (DynamoDB Accelerator) is a fully managed, highly available, in-memory cache for Amazon DynamoDB that provides microsecond read latency.
Term 142
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 143
Decoupling is the practice of designing system components so that they are independent, reducing dependencies so a change or failure in one part does not break others.
Term 144
A Dedicated Host is a physical server in the cloud that is reserved exclusively for your use, giving you control over which instances run on that host and visibility into the underlying hardware.
Term 145
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 146
A configuration in IT systems where security services or appliances operate in an isolated, single-purpose environment to prevent interference with other functions and reduce attack surface.
Term 147
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 148
Defense in depth is a cybersecurity strategy that uses multiple layers of security controls to protect information and systems, so if one layer fails, another layer is already in place to stop the attack.
Term 149
Denormalization is a database design strategy that adds redundant data to one or more tables to reduce the number of joins needed in queries, improving read performance at the cost of extra storage and more complex writes.
Term 150
Deployment Manager is a Google Cloud service that lets you define and manage your cloud resources using declarative templates, so you can create, update, and delete infrastructure as a single unit.