1. A computer program product, comprising: a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: sending one or more requests over a network by an activated virtual adapter, the activated virtual adapter being hosted on a physical adapter of a host system coupled to the network, the virtual adapter being for use by a guest, hosted by the host system, in performing data input and output, and the sending being based on one or more indications provided to the physical adapter, absent involvement of the guest, that the one or more requests be sent by the virtual adapter; receiving access control information by the activated virtual adapter from one or more responses to at least one request of the one or more requests, the access control information being indicative of one or more access controls enforced by the network in controlling access by the activated virtual adapter to one or more network components of the network; providing at least some of the access control information to a control component, wherein the sending the one or more requests, the receiving the access control information, and the providing the at least some of the access control information are performed absent involvement of the guest; and returning the activated virtual adapter to an initial state of the virtual adapter that the virtual adapter was in prior to activation of the virtual adapter.