- Honeynet A network of computers that is intentionally exposed to the Internet in order to lure attackers and study their methods. It is used in security research and incident response. Examples of honeynets include the Honeynet Project and the Honeypot Project.
- Honeypot A security mechanism set up to detect, deflect, or study hacking attempts. It is designed to appear as a legitimate part of the network but is isolated and monitored to capture unauthorized access attempts or understand an attacker's techniques.
- Horizontal defense-in-depth Horizontal defense-in-depth encompasses the implementation of security measures at the same network layer to create a multi-faceted barrier to threats. It involves using a variety of tools and techniques at a particular point in the network architecture, such that an attacker breaching one control encounters another.
- Host A computer or other device connected to a network that provides data, services, or resources to clients. In network architecture, hosts can serve as servers, offering web pages, applications, or storage, and enable users to access and utilize these resources.
- Host-Based Firewalls Security software installed on individual hosts or servers that controls the incoming and outgoing network traffic based on predetermined security rules. Host-based firewalls protect against unauthorized access and can provide tailored security at the host level.
- 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 is responsible for providing reliable end-to-end communication between hosts on a network. This concept is used in the design and implementation of networked systems to enable communication between different devices and systems. Examples of the use of the host-to-host transport layer include the transmission of data over the Internet and the exchange of messages between applications on a local network.
- 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.
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