Considering computer technology, a firewall acts as a security buffer between a corporation's private network and all external networks.
What is a firewall?
A firewall is a protection device installed on computer hardware or software.
The firewall's purpose in a computer is to protect the computer or network from unauthorized access through filtering and blocking.
Hence, in this case, it is concluded that the correct answer is "firewall."
Learn more about firewalls here: https://brainly.com/question/13693641
