NSX Services Requests documented in this section manage global NSX objects such as certificates and grouping objects. Certificate ManagementNSX supports selfâsigned certificates, certificates signed by a Certification Authority (CA), and certificates generated and signed by a CA. Applications and Application Groups NSX application and application group requests provide the capability for defining sets and groups of certain entities, which you can then use when specifying other network-related configurations, such as in firewall rules. Security GroupsA security group is a collection of assets or grouping objects from your VMware Cloud Director inventory Security TagsYou can use the VMware Cloud Director API for NSX to manage NSX security tags and their virtual machine assignments. For example, you can create a user-defined security tag, assign tags to a virtual machine, view tags assigned to virtual machines, and view virtual machines that have a specific tag assigned. Grouping ObjectsYou can use the VMware Cloud Director API for NSX to create and manage IP address groups and MAC address groups in an organization virtual data center.