Which of the following is not a type of contract that can be applied in an ACI fabric?
Of the available choices, in-band is not a type of contract that can be applied in a Cisco Application Centric Infrastructure (ACI) fabric. Contracts are policy objects that define how endpoint groups (EPGs) communicate. There are three types of contracts that can be applied in an ACI fabric:
Regular — applies filters to matching traffic and typically follows taboo contracts
Taboo — denies and logs matching traffic
Out-of-Band (OOB) – applies to OOB traffic from the management tenant
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. With the exception of some types of traffic—such as network configuration traffic, routing protocol traffic, and multicast traffic—EPGs require contracts in order to communicate with each other.
Contracts consist of subjects, filters, actions, and optionally, labels. Subjects are groups of filters that are specific to a given application. Filters classify traffic by matching Open Systems Interconnection (OST) network model Layer 2 or Layer 4 characteristics. Actions are the action that is performed on traffic that matches the filters. Labels can be created to group EPGs or subjects. These groupings add granularity to the enforcement of a policy.