# API How-Tos [Cloud API](https://api.ionos.com/docs/cloud/v6/) allows contract administrators, owners, and authenticated users with the required permissions to create a NSG and associate it with [Network Interface Cards (NICs)](https://docs.ionos.com/cloud/support/general-information/glossary-of-terms#network-interface-card-nic) or [Virtual Machine (VM)](https://docs.ionos.com/cloud/support/general-information/glossary-of-terms#virtual-machine-vm) resources.
Create a Default Network Security GroupLearn how to create a Default NSG.create-default-nsg
Create a Custom Network Security GroupLearn how to create a Custom NSG.create-custom-nsg
Convert a Custom Network Security Group to DefaultLearn how to convert a Custom NSG to a Default NSG.convert-custom-nsg
Retrieve Network Security Groups by Group IDLearn how to retrieve a NSG by Group ID.get-nsg-by-group
Retrieve all Network Security GroupsLearn how to retrieve your NSGs.get-nsg
Update a Network Security GroupLearn how to update a NSG.update-security-group
Delete a Network Security GroupLearn how to delete your NSGs.delete-nsg
Create Firewall rule for a Network Security GroupLearn how to create a Firewall rule for the specified NSG.create-rules
Retrieve Firewall rules by Network Security Group IDLearn how to retrieve all Firewall rules for the specified NSG.get-rules
Update Firewall rules of a Network Security GroupLearn how to update Firewall rule of the specified NSG.update-rules
Delete Firewall rule from a Network Security GroupLearn how to delete a firewall rule from a NSG.delete-rule
Attach a List of Security Groups to a Server or NICLearn how to attach a list of NSGs to a server or NIC.attach-server-to-nsg