In cyber workforce roles, what best differentiates blue team and red team?

• A. Blue team defends networks and interprets alerts; red team simulates adversaries to test defenses; purple teams coordinate both.
• B. Blue team simulates adversaries to test defenses.
• C. Blue team manages vendor risk; red team manages patching.
• D. Blue team handles physical protection; red team handles incident response.

Answer: (D)

The key distinction is what each role is trying to accomplish: blue team members defend the network, monitor for threats, interpret alerts, and respond to incidents to keep systems secure; red team members actively emulate real attackers through controlled tests and exploits to reveal weaknesses so defenses can be strengthened. In practice, red team activities simulate adversaries to validate defenses, while blue team activities focus on detection, containment, and recovery. Purple teams exist to coordinate both efforts and translate red-team findings into improved blue-team defenses. The statement that blue handles physical protection and red handles incident response mixes different domains and mislabels incident response, which is fundamentally a blue-team function, not red. So the best differentiator is defense versus adversary emulation: blue teams defend and respond, red teams imitate attackers to test and harden those defenses.