The flicker of the terminal window was the only light in the small, cramped apartment. Outside, the Buenos Aires night hummed with the sound of late-night buses and the distant bark of a dog. Inside, Sofía Valdez was neck-deep in a problem.

The red error refused to go away. She had followed the lab from the Cisco NetAcad portal— Curso 4: Mantenimiento de Redes . But the simulated network in Packet Tracer kept collapsing. Her frustration boiled over. She slammed the notebook shut.

Inside, a loose paper fell out. It wasn't her father's handwriting. It was a single, typed line:

She picked up her phone to call her dad. But before she dialed, she opened a new document and typed:

She typed slowly, deliberately:

"CV: Sofía Valdez. Técnico en Redes (CCNA en progreso)."

Suddenly, the error code wasn't a wall of text. It was a missing neighbor. A dead end in the neighborhood. She hadn't set the router-id . The routers didn't know each other's names.