1. A computer program product, comprising: a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution byte processing circuit for performing a method comprising: activating, by a control component of a computing environment, a virtual adapter hosted on a physical adapter of a host system of the computing environment, the virtual adapter for use by a guest of the host system in performing data input and output, wherein the control component is separate from the host system, and the activating comprises the control component providing a request to the physical adapter that the virtual adapter be activated, wherein the activating activates the virtual adapter absent involvement of the guest; issuing, by the control component, a first set of one or more requests to the physical adapter, the first set of one or more requests initiating issuance, by the virtual adapter, of a second set of one or more requests to at least one network device to acquire network access control information indicative of controls enforced in controlling access by the activated virtual adapter to network components of a network; based on the activating the virtual adapter absent involvement of the guest and on the issuing of the first set of one or more requests, obtaining, by the control component, configuration information of the activated virtual adapter from the physical adapter, the configuration information generated based on the activating and on the second set of one or more requests issued by the virtual adapter, wherein the configuration information comprises at least some of the network access control information, the at least some of the network access control information being acquired by the virtual adapter in response to the second set of one or more requests to the at least one network device and provided to the control component; ascertaining, by the control component, a configuration of the activated virtual adapter based on the obtained configuration information; and initiating return of the virtual adapter to a state of the virtual adapter prior to the activating.