Basically,　a(71)is　a　standalone　process　or　a　set　of　integrated　processes　that　runs　on　a　router　or　server　to　control　the　flow　of(72)application　traffic(73)through　it.　Typically,　firewalls　are(74)on　the　entry　point　to　a　public　network　such　as　the　Internet.　They　could　be　considered　traffic　cops.　The　firewall'　s(75)is　to　ensure　that　all　communication　between　an　organization's　network　and　the　Internet　conform　to　the　organization's　security　policies.