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DNS server firewall load balancer reverse proxy NAT gateway

contains a database of public IP addresses and their associated hostnames and often resolves or translates: those names to IP addresses, as requested DNS server enforces a set of rules about which data packets are allowed to enter or leave a network firewall distributes network and application traffic across different servers load balancer retrieves resources on behalf of a client from one or more servers, then returns resources to the client, thus appearing as if they originated from the service Itself reverse proxy