Stateless

Whether a service or protocol is stateless or stateful indicates whether it maintains a known "state" with its clients or other services
- e.g., a stateless firewall only processes requests as they come, and does not actively track connections between hosts and servers
- TCP is a stateful protocol, because it keeps track of exchanges between hosts
- UDP is a stateless protocol, because no connection is established, and information is sent without confirming receipt

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