Host-based Intrusion Detection Systems (HIDS)/Host-based Intrusion Prevention Systems (HIPS): Security measures deployed on individual devices or hosts to monitor and analyze system activities for malicious behavior. HIDS focuses on detecting potential threats by examining log files, system calls, and network traffic and then alerting administrators if suspicious activities are detected. On the other hand, HIPS takes it a step further by not only detecting threats but also attempting to prevent them from executing harmful actions. These host-based systems are particularly beneficial in identifying insider threats or targeted attacks that might be missed by network-based security systems.

Host escape: A type of attack in which an attacker gains access to the host system in a virtualized environment. It is used to bypass security measures and gain access to sensitive data or systems. Examples include using vulnerabilities in the host system or exploiting misconfigurations in the virtual environment.

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.