The FREE Cybersecurity Glossary by Thor Pedersen!

Host isolation: The practice of segregating individual systems or devices on a network to limit the spread of malware or the progression of an attacker. It is often implemented through network segmentation and firewall rules that restrict communication between hosts. By keeping systems isolated, if one device is compromised, the threat is less likely to spread to other devices. This can be particularly valuable in incident response scenarios, where a compromised host can be isolated to prevent further network contamination.

Host-to-host transport layer: The layer of the OSI model responsible for providing reliable end-to-end communication between devices in a network, ensuring data integrity and proper sequencing. Examples include Transmission Control Protocol (TCP) within the Internet protocol suite.

Hot and cold aisles: A layout design for data centers aimed at efficient cooling of equipment. In this configuration, rows of server racks are arranged so that the fronts of the servers (cold aisles), which intake air, face each other, and the backs of the servers (hot aisles), which exhaust air, also face each other. This design allows for more efficient cooling by keeping the cold intake and hot exhaust air separate, reducing energy costs and optimizing the longevity and performance of the equipment. As such, maintaining the integrity of hot and cold aisle configuration can be a part of physical security and risk management strategy in data centers.

Hot Fix (Hotfix): A rapid and focused software update intended to fix specific bugs or security vulnerabilities. Hotfixes are typically released immediately upon issue identification and can often be applied without requiring a system restart.

Hot Rollover: A feature in network devices that allows changes to be made to the device's configuration without disrupting network traffic. It ensures continuous operation during updates or maintenance, common in devices like Cisco routers and switches.

Hot Site: A location that is equipped with the necessary hardware and software to quickly resume IT operations in the event of a disaster. It is used as a backup site for business continuity and disaster recovery. Examples include having a hot site set up in a different city or region, having duplicate servers and equipment on site, and regularly testing the hot site to ensure it is ready for use.