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If SW1’s Gi0/1 interface tries to use autonegotiation, SW1 would also use a speed of 100 Mbps, but default to use half duplex


Cover of CCENT/CCNA ICND1 100-105 Official Certification Guide


100Mbps -> Full Duplex

Recordando, que si un Switch detecta la configuración de speed y duplex a través del cable, si la velocidad detectada es de 100Mbps automáticamente coloca el modo 'Dúplex' en 'Half'.