Assertion: firewall | /r/HasProperty | aware of current communications
Facets:
Source sentences:
text: Typically, firewalls may also provide stateful inspection (they are aware of current communications and judge new requests against those in process), dynamic packet filtering (ports are not always opened, but opened in response to requests, then closed), application layer filtering (filtering at the application vs. network layer -- i.e., based on the program, not simple packet reading, or using the application itself as a filter) and more.