Читать книгу Service Level Management in Emerging Environments - Nader Mbarek - Страница 33

Availability refers to the possibility of on-demand access and use of resources by an authorized entity, following authentication and access control. Availability is a security service. Indeed, a service that becomes unavailable after a Denial of Service (DoS)-type attack, for instance, is an unsecured service and may be compromised at any time (Mosenia and Jha 2017). Availability in the IoT is essential to provide an Internet-enabled environment that is completely operational. In the context of the IoT, this service integrates both the availability of devices (that is, objects and gateways), allowing for uninterrupted data collection, and also the availability of IoT services offered to users. This second type of availability is determined by the configuration of the IoT environment, resulting in the need to make appropriate choices for management and administration protocols and for protection against DoS attacks (DDoS: Distributed DoS). Services offered in the IoT must be constantly available while taking into account the critical nature of some of these services (Mosenia and Jha 2017). In this context, availability round-the-clock, 365 days a year, is required for critical IoT services, such as certain applications in the field of e-health.