> For the complete documentation index, see [llms.txt](https://http3-explained.haxx.se/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://http3-explained.haxx.se/es/the-protocol/feature-handshakes.md).

# Rápido establecimiento de comunicación

QUIC ofrece configuraciones de conexión 0-RTT y 1-RTT, lo que significa que, en el mejor de los casos, QUIC no necesita ningún viaje de ida y vuelta adicional al establecer una nueva conexión. El más rápido de los dos, el handshake 0-RTT, sólo funciona si se ha establecido una conexión previa con un host y se ha almacenado en caché un secreto de esa conexión.

## Datos tempranos

QUIC permite a un cliente incluir datos ya en el handshake 0-RTT. Esta característica permite a un cliente entregar datos al peer tan rápido como sea posible, y eso entonces, por supuesto, permite al servidor responder y enviar datos de vuelta incluso antes.


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