Which agency is the lead for monitoring and protecting all federal government computer networks from cyberterrorism?

• A. FBI
• B. DHS
• C. CIA
• D. NSA

Answer: (D)

The question tests who has the authority and capability to monitor and defend federal government computer networks against cyberterrorism. The best answer is the National Security Agency because its mission includes protecting national security information systems and conducting defensive cyber operations for the federal government. NSA has the specialized expertise, access, and statutory authority to oversee and coordinate cyber defense across government networks, detecting intrusions, mitigating threats, and guiding incident response in a national-security context. It works alongside other agencies like DHS/CISA, but for federal networks with national security implications, NSA is the lead.

FBI handles cybercrime investigations, CIA concentrates on foreign intelligence, and DHS/CISA focuses on protecting civilian federal networks and critical infrastructure. While those roles are important, they do not encompass the government-wide cyber defense mandate that NSA is positioned to lead in this context.