Question

a(n) _______ is a program that looks at each packet as it travels on the internet. backdoor program encryption virus packet analyzer black-hat hacker i dont know yet

Explanation:

A packet analyzer is a program designed to capture and examine network packets as they travel over the Internet. A backdoor program is for unauthorized access, an encryption virus encrypts data, and a black-hat hacker is a person, not a program.

Answer:

packet analyzer