Two controls or methods that help harden a server or network.
One would be the firewall it makes a foundation to secure a policy that will denie all traffic unless explicitly permitted. It looks and updates the rules and changes in a network and requirements, closing any unused or unnecessary network ports to reduce the attacks.
The second one would be Zero Trust Network Access (ZTNA) This is just as it is said it allows no access in a connections security and it will need to be reautherized for every action taken. This help keep the data and network secure and hard to override, Even with familiar and trusted networks trying to access it it gets blocked till its autherized. Organizations can define the securitypolicies for each deviced connected to the network.