olemus
tulemüür, mis on suunatud mitte portidele, vaid rakendustele; on täpsema toimega ja lisavõimetega
= a firewall understanding not only ports, but that specific applications listen to specific ports

ülevaateid
https://security.stackexchange.com/questions/183994/whats-the-difference-between-an-application-aware-firewall-and-a-web-applica

näiteid
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_data_zbf/configuration/xe-16-9/sec-data-zbf-xe-16-9-book/sec-data-zbf-xe-16-9-book_chapter_0100100.html
https://link.springer.com/article/10.1007/s10922-020-09518-z