(第1空)Network firewalls are security devices used to stop or miltigate ( ) access to private networks connected to the Internet, especially intranets.The only traffic allowed on the networks is defined via firewall ( )-any other traffic attempting to access the network is blocked.Network firewalls sit at the ( ) line of a network,acting as a communications

liaison between intemal and extemal devics,When properly configured,a firewall alws users to access any of the resources they need while simultaneously keeping out unwanted access,In addition toliniting access to a protected computer and network, a firewall can ( ) all taffic coming into or leaving a network,and manage remote access to a private  network through secure authertication crtificates and logins. ( ) firewalls examine every packet that passes through the network and then accept or deny it as defined by rules set by the user