Assertion: personal firewall | /r/AtLocation | the background
Facets:
value: at the device
type: LOCATION
Source sentences:
text: Often compared to anti-virus applications, personal firewalls work in the background at the device (link layer) level to protect the integrity of the system from malicious computer code by controlling Internet connections to and from a user's computer, filtering inbound and outbound traffic, and alerting the user to attempted intrusions.