Exploration lan switching_chapter2

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Configure a Switch

LAN Switching and Wireless – Chapter 2

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Objetivos

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Introducción a las LAN 802.3/Ethernet

Elementos claves de las redes 802.3/Ethernet

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Introducción a las LAN 802.3/Ethernet Elementos claves de las redes 802.3/Ethernet

Recordar que CSMA/CD sólo funciona en half

duplex

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Introducción a las LAN 802.3/Ethernet Elementos claves de las redes 802.3/Ethernet

Se utilizan dos tipos de parámetros duplex para las comunicaciones en una red Ethernet:

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Introducción a las LAN 802.3/Ethernet Configuración del puerto del switch:

Los switches Cisco Catalyst cuentan con tres parámetros:

–La opción auto establece el modo autonegociación de duplex. Cuando este modo se encuentra habilitado, los dos puertos se comunican para decidir el mejor modo de funcionamiento.

–La opción full establece el modo full-duplex.

–La opción half establece el modo half-duplex.

Nota: Al tener half-duplex en un extremo y full-duplex en el otro, pueden producirse colisiones tardías en el extremo de half-duplex

Al habilitar la función auto-MDIX, se puede utilizar un cable de conexión directa o cruzada para realizar la conexión con un puerto 10/100/1000 de cobre situado en el switch, independientemente del tipo de dispositivo que se encuentre en el otro extremo de la conexión.

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Introducción a las LAN 802.3/Ethernet Direccionamiento MAC y Tablas de direcciones

MAC de los switches

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Aspectos que se deben tener en cuenta para las redes 802.3/Ethernet

Dominios de broadcast

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Aspectos que se deben tener en cuenta para las redes 802.3/Ethernet Latencia de la red

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Aspectos que se deben tener en cuenta para las redes 802.3/Ethernet Congestión de red

Causas más comunes:–Tecnología de redes y computadoras cada vez más potentes. Pueden enviar una mayor cantidad de datos a través de la red y también procesarlos a una mayor velocidad.

–Volumen de tráfico de la red cada vez mayor.

–Aplicaciones con alta demanda de ancho de banda. Por ejemplo: las aplicaciones de edición, diseño de ingeniería, video a pedido (VoD), aprendizaje electrónico (e-learning) y streaming video requieren una considerable capacidad y velocidad de procesamiento.

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Aspectos que se deben tener en cuenta para las redes 802.3/Ethernet Segmentación LAN

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Consideraciones de diseño de la LAN Control de la latencia de la red

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Describe the switch forwarding methods

Explain the Functions that Enable a Switch to Forward Ethernet Frames in a LAN

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Explain the Functions that Enable a Switch to Forward Ethernet Frames in a LAN Explain symmetric and asymmetric Switching

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Explain the Functions that Enable a Switch to Forward Ethernet Frames in a LAN Describe how memory buffering works

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Explain the Functions that Enable a Switch to Forward Ethernet Frames in a LAN Compare Layer 2 with Layer 3 switching

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Configure a Switch for Operation in a Network Describe the Cisco IOS commands used to navigate

the command-line

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Configure a Switch for Operation in a Network Describe the Cisco IOS help facilities

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Configure a Switch for Operation in a Network Describe the Cisco IOS commands used to access the

command history

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Configure a Switch for Operation in a Network Describe the boot sequence of a Cisco switch

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Configure a Switch for Operation in a Network Describe how to prepare the switch to be configured

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Configure a Switch for Operation in a Network Describe how to perform a basic switch configuration

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Configure a Switch for Operation in a Network Describe how to verify the Cisco IOS configuration

using the Show command

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Configure a Switch for Operation in a Network Describe how to manage the Cisco IOS configuration

files

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Configure Basic Security on a Switch Describe the Cisco IOS commands used to configure

password options

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Describe the Cisco IOS commands used to configure a login banner

Configure Basic Security on a Switch

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Describe the how to configure Telnet and SSH on a switch

Configure Basic Security on a Switch

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Describe the key switch security attacks. The description should include, MAC address flooding, spoofing attacks, CDP attacks, and Telnet attacks

Configure Basic Security on a Switch

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Describe how network security tools are used to improve network security

Configure Basic Security on a Switch

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Describe why you need to secure ports on a switch

Configure Basic Security on a Switch

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Describe the Cisco IOS commands used to disable unused ports

Configure Basic Security on a Switch

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Summary LAN Design

Process that explains how a LAN is to be implemented

Factors to consider in LAN design include

Collision domains

Broadcast domains

Network latency

LAN segmentation

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Summary

Switch forwarding methods

Store & forward – used by Cisco Catalyst switches

Cut through – 2 types

Cut through

Fast forwarding

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Summary

Symmetric switching

Switching is conducted between ports that have the same bandwidth

Asymmetric switching

Switching is conducted between ports that have unlike bandwidth

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Summary

CISCO IOS CLI includes the following features

Built in help

Command history/options

Switch security

Password protection

Use of SSH for remote access

Port security

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