NOVA Component in OpenStack

Explanation.

OpenStack is an open-source cloud computing platform that allows users to manage resources for cloud computing deployment. One of its key components is NOVA, which is responsible for launching and managing virtual machine instances.

A. It launches virtual machine instances. This statement is true. Nova is responsible for creating and managing virtual machines, and it is the primary component for managing compute resources in OpenStack.

B. It is considered the cloud computing fabric controller. This statement is not entirely accurate. While Nova does play a critical role in managing compute resources in OpenStack, it is not considered the cloud computing fabric controller. That role is typically fulfilled by the OpenStack Neutron component, which provides networking services.

C. It provides persistent block storage to running instances of virtual machines. This statement is not entirely accurate. While Nova can manage storage for virtual machines, it is not responsible for providing persistent block storage. That role is typically fulfilled by the OpenStack Cinder component, which provides block storage services.

D. It tracks cloud usage statistics for billing purposes. This statement is not entirely accurate. While Nova can track usage statistics for virtual machine instances, it is not responsible for tracking cloud usage statistics for billing purposes. That role is typically fulfilled by the OpenStack Ceilometer component, which provides telemetry services.

E. It provides the authentication and authorization services. This statement is not accurate. Nova is not responsible for providing authentication and authorization services. That role is typically fulfilled by the OpenStack Keystone component, which provides identity services.

In summary, options A and B are not entirely accurate. Option C, D, and E are not true at all. Therefore, options A and B are the correct answers.