Answer: Circuit-level proxy firewall is deployed because it prevents these types of attacks.
Step-by-step explanation:
The type of firewall that Javier would have deployed is the circuit-level proxy firewall is deployed because it prevents these types of attacks.
The circuit level proxy firewall is vital for verifying TCP handshakes in order to check the incoming traffic with little time and resources used. It's necessary in minimizing the performance impact on a network.