Fill in the Blanks Firewalls and DMZs Fill in the BlanksOnline version Test your knowledge of firewalls and DMZs by filling in the missing words in this network security text. by Imke Wellmann 1 public barrier security external networks DMZs firewalls traffic unauthorized internet layer resources demilitarized zones network segments services rules internal isolated sensitive Introduction to and Firewalls are a key component of that monitor and control incoming and outgoing network based on predetermined security . They establish a between secured networks and untrusted , such as the . DMZs , or , are network that are from the internal network and exposed to the internet . They provide an additional of security by segregating - facing from the internal network . Firewalls and DMZs work together to protect data and prevent access to network .