Which of the following describes a group of Layer 3 networks that can be shared with groups of private networks in a Cisco ACI fabric?
Of the available choices, common best describes a group of Layer 3 networks that can be shared with groups of private networks in a Cisco Application Centric Infrastructure (ACI) fabric. Common is the name for a special tenant in a Cisco ACI fabric. The common tenant typically contains policies that can be shared with other tenants.
Tenants are containers that can be used to represent physical tenants, organizations, domains, or specific groupings of information. A tenant in a Cisco ACI fabric can contain multiple Layer 3 networks. Typically, tenants are configured to ensure that different policy types are isolated from each other, similar to user groups or roles in a role-based access control (RBAC) environment.
A context is a Cisco ACI fabric logical construct that is equivalent to a single Internet Protocol (IP) network or IP name space. In this way, a context can be considered equivalent to a single virtual routing and forwarding (VRF) instance. An endpoint policy typically ensures that all endpoints within a given context exhibit similar behavior. Contexts that are placed in the common tenant can likewise be shared among tenants. Contexts that are placed within a private tenant, on the other hand, are not shared with other tenants.
Endpoint groups (EPGs) are logical groupings of endpoints that provide the same application or components of an application. For example, a collection of Hypertext Transfer Protocol Secure (HTTPS) servers could be logically grouped into an EPG labeled WEB. EPGs are typically collected within application profiles. EPGs can communicate with other EPGs by using contracts.