Red emergency lights bathe the bridge in an ominous glow. Klaxons wail as sparks fly from damaged consoles. You're Cadet Chen, fresh from the Academy's Network Security program. Captain Rodriguez turns to you, her face grave. "Cadet, we've been hit by a cyber attack. Main systems are down, and we're on emergency power. Your Network+ training is our best hope." She hands you an emergency access card. "The attackers have compromised our network infrastructure. We need you to restore systems deck by deck. Start with basic connectivity - remember your OSI model training." Your wrist-comm beeps: "SYSTEM ALERT: Network segmentation activated. Manual intervention required."