When implementing components into an enterprise network, what is the purpose of a firewall?

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When implementing components into an enterprise network, what is the purpose of a firewall?

A firewall is a system that inspects network traffic and makes forwarding decisions based solely on Layer 2 Ethernet MAC addresses.
A firewall is a system that is designed to secure, monitor, and manage mobile devices, including corporate-owned devices and employee-owned devices.
A firewall is a system that stores vast quantities of sensitive and business-critical information.
A firewall is a system that enforces an access control policy between internal corporate networks and external networks.

Explanation: A firewall is a system that enforces an access control policy and prevents the exposure of sensitive hosts, resources, and applications to untrusted users.

When implementing components into an enterprise network, what is the purpose of a firewall?

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