An organization recently faced a cyberattack where an attacker captured legitimate user credentials and gained access to the critical information systems. He also installed various ransomware on the…

An organization recently faced a cyberattack where an attacker captured legitimate user credentials and gained access to the critical information systems. He also installed various ransomware on the organization's file servers and databases. To prevent this situation from happening in the future, the organization has decided to route all the incoming and outgoing network traffic through a centralized access proxy apart from validating user credentials. Which of the following defensive mechanisms the organization is trying to strengthen?