A college needs to protect its network from unauthorized access and malware attacks. The college

installs a device that will act as a barrier between the internal campus network and the Internet by

filtering incoming and outgoing traffic based on predefined rules. What is this type of device called?

Enter your answer in all lower case. And, if there are multiple words only add a single space

between words. For example, if the answer is computer mouse enter computer mouse, not

Computer Mouse or computer mouse.