An attacker attempts to create a DoS event against the VoIP system of a company. The attacker uses a tool to flood the network with a large number of SIP INVITE traffic. Which of the following would be LEAST likely to thwart such an attack?

An attacker attempts to create a DoS event against the VoIP system of a company. The attacker uses a tool to flood the network with a large number of SIP INVITE traffic. Which of the following would be LEAST likely to thwart such an attack?
A . Install IDS/IPS systems on the network
B . Force all SIP communication to be encrypted
C . Create separate VLANs for voice and data traffic
D . Implement QoS parameters on the switches

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Answer: D