An administrator is testing a new web server from outside of the corporate firewall. The administrator performs a test from a single PC and the web server responds accordingly. The administrator…

An IPS (Intrusion Prevention System) actively blocks detected malicious traffic, but a firewall is a more general device that controls all traffic based on rules, making it a broader and more common cause for blocking legitimate-looking, but high-volume, connections.

Blacklisting involves explicitly denying access to specific IP addresses or services, which is a policy or rule that a firewall might enforce, but 'Firewall' is the device itself responsible for enforcing such rules.

An IDS (Intrusion Detection System) monitors network traffic for suspicious activity and generates alerts but typically does not actively block traffic, unlike a firewall or IPS.

Whitelisting involves explicitly allowing access only from specified IP addresses or services and denying all others, which is also a policy or rule that a firewall might enforce, but 'Firewall' is the device responsible for enforcement.

A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. In this scenario, the firewall is likely configured to detect and block a sudden increase in connection attempts from what appears to be a single external IP address (due to NAT), interpreting it as a potential attack or exceeding connection limits, thus preventing the multiple virtual machines from reaching the web server.