A multitenant cloud is a cloud architecture where multiple customers (tenants) share the same physical infrastructure or platform while maintaining logical isolation. Let's analyze each statement:

A . Tenants are aware of other tenants using their shared resources.

Incorrect: In a multitenant cloud, tenants are logically isolated from one another. While they may share underlying physical resources (e.g., servers, storage), they are unaware of other tenants and cannot access their data or applications. This isolation ensures security and privacy.

B . Servers, network, and storage are separated per tenant.

Incorrect: In a multitenant cloud, resources such as servers, network, and storage are shared among tenants. The separation is logical, not physical. For example, virtualization technologies like hypervisors and software-defined networking (SDN) are used to create isolated environments for each tenant.

C . The entities of each tenant are isolated from one another.

Correct: Logical isolation is a fundamental characteristic of multitenancy. Each tenant's data, applications, and configurations are isolated to prevent unauthorized access or interference. Technologies like virtual private clouds (VPCs) and network segmentation ensure this isolation.

D . Multiple customers of a cloud vendor have access to their own dedicated hardware.

Correct: While multitenancy typically involves shared resources, some cloud vendors offer dedicated hardware options for customers with strict compliance or performance requirements. For example, AWS offers 'Dedicated Instances' or 'Dedicated Hosts,' which provide dedicated physical servers for specific tenants within a multitenant environment.

JNCIA Cloud Reference:

The Juniper Networks Certified Associate - Cloud (JNCIA-Cloud) curriculum discusses multitenancy as a key feature of cloud computing. Multitenancy enables efficient resource utilization and cost savings by allowing multiple tenants to share infrastructure while maintaining isolation.

For example, Juniper Contrail supports multitenancy by providing features like VPCs, network overlays, and tenant isolation. These capabilities ensure that each tenant has a secure and independent environment within a shared infrastructure.

NIST Cloud Computing Reference Architecture

Juniper JNCIA-Cloud Study Guide: Multitenancy