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Security+ Guide to Network Security Fundamentals

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data backups The process of copying information to a different medium and storing it (preferably at an off-site location) so that it can be used in the event of a disaster. disaster recovery The procedures and processes for restoring an organization’s IT operations following a disaster. disaster recovery plan (DRP) A written document that details the process for restoring IT resources following an event that causes a significant disruption in service. Faraday cage A metallic enclosure that prevents the entry or escape of an electromagnetic field. forensics (forensic science) The application of science to questions that are of interest to the legal profession. heating, ventilation, and air conditioning (HVAC) Systems that provide and regulate heating and cooling. high availability A system that can function for an extended period of time with little downtime. hot aisle/cold aisle A layout in a data center that can be used to reduce heat by managing the air flow.
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Security+ Guide to Network Security Fundamentals, Fourth Edition 13-12 hot site A duplicate of the production site that has all the equipment needed for an organization to continue running, including office space and furniture, telephone jacks, computer equipment, and a live telecommunications link. mean time between failures (MTBF) A statistical value that is the average time until a component fails, cannot be repaired, and must be replaced. mean time to restore (MTTR) The average time needed to reestablish services to their former state. order of volatility The sequence of volatile data that must be preserved in a computer forensic investigation. RAID (Redundant Array of Independent Drives) A technology that uses multiple hard disk drives for increased reliability and performance. recovery point objective (RPO) The maximum length of time that an organization can tolerate between backups. recovery time objective (RTO) The length of time it will take to recover the data that has been backed up. server cluster A combination (clustering) of two or more servers that are interconnected to appear as one. single point of failure A component or entity in a system which, if it no longer functions, would adversely affect the entire system. succession planning Determining in advance who will be authorized to take over in the event of the incapacitation or death of key employees. symmetric server cluster A technology in which every server in the cluster performs useful work and if one server fails, the remaining servers continue to perform their normal work as well as that of the failed server. system image A snapshot of the current state of the computer that contains all settings and data. warm site A remote site that contains computer equipment but does not have active Internet or telecommunication facilities, and does not have backups of data.
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