Conocimientos Básicos

Enrutamiento

El enrutamiento es el relevo de tráfico de una red a otra paquete por paquete. ¿Por qué relevo? porque éste consiste en pasar la reponsabilidad de un enrutador a otro, es decir, un enrutador decide cómo enviar un paquete y se desentiende de lo que le pueda pasar al mismo de ahí para adelante, eso en inglés se llama relay, en español se llama relevo.

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Tutorial VLSM

El subneteo con VLSM (Variable Length Subnet Mask), máscara variable ó máscara de subred de longitud variable, es uno de los métodos que se implementó para evitar el agotamiento de direcciones IPv4 permitiendo un mejor aprovechamiento y optimización del uso de direcciones.

VLSM: Es el resultado del proceso por el cual se divide una red o subred en subredes más pequeñas cuyas máscaras son diferentes según se adaptan a las necesidades de hosts por subred.

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Direcciones IP

Para comprender las clases de direcciones IP, usted necesita entender que cada dirección IP consiste en 4 octetos de 8 bits cada uno.

El valor del primer octeto es el que determina el tipo de clase. Observe la siguiente tabla para ver las diferentes clases.

Clase A = 0.x.x.x a 126.x.x.x
Clase B = 128.0.x.x a 191.255.x.x
Clase C = 192.0.0.x a 223.255.255.x

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Modelo OSI y TCP/IP

Modelo OSI

El modelo OSI (Open Systems Interconnection) (ISO/IEC 7498-1) es un producto del esfuerzo de Open Systems Interconnection en la Organización Internacional de Estándares. Es una prescripción de caracterizar y estandarizar las funciones de un sistema de comunicaciones en términos de abstracción de capas. Funciones similares de comunicación son agrupadas en capas lógicas. Una capa sirve a la capa sobre ella y es servida por la capa debajo de ella.

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