| For mobile users, firewalls allow remote access into private networks by the use of secure logon procedures and authentication certificates. |
| Users are advised to use personal firewalls and anti-virus defences to defend against infection. |
| I have 3 firewalls and plenty of antivirus software installed on my computer. |
| Using packet filtering, firewalls can restrict the types of activity allowed, such as permitting web access and email but denying telnet and ftp. |
| He plays a computer security expert forced to hack into his own firewalls in order to save his family from bank robbers. |
| It also defeats all known firewalls, killing the running process, replacing the firewall icon, and allowing a stealth FTP connection. |
