Router Fundamentals

Chapter Objectives

Explain router components Explain router installation Discuss router boot sequence Define Internetwork Operating System (IOS) Set hostname, banners and passwords for the

router

Recall - I Different network devices include:

Hubs Routers Switches Bridges Repeaters

Different types of hubs include: Active Passive Hybrid

Recall - II

Different WAN devices include: WAN Switch Access Server Modem Channel Service Unit ISDN Terminal Adapter

Routers

Routers are devices that forward data to their appropriate destinations

Routers decide the best possible route that a packet needs to take to reach its destination

Routers maintain a routing table to decide the route for the data

Routers

The functions of routers are: Provide traffic management Do not pass broadcast traffic Connect different network segments

Router Components

Router components allow the router to enter the bootup process, load its operating system, and configuration files

Router Boot Sequence

The router requires all the router components during its boot up

Internetwork Operating System IOS acts as an interface between the network

devices and the user It is stored in the flash memory of the router The Cisco IOS software requires the processor of

the system for configuring and maintaining the network devices

Different features of IOS include: Support for different technologies Scalability Security

Router Ports Router ports help to configure the router, verify its

configuration and access Cisco IOS

Rear Panel of the Cisco RouterRear Panel of the Cisco Router

Router Administrative Functions Router administrative functions allow easy

troubleshooting and maintenance of routers Router administrative function include:

Assigning hostname Assigning banners setting password

Banners

Banner is a message displayed to all the users when they access the router through Telnet, console and auxiliary ports

It can be used to display information about the router itself or nay kind of security message

Four types of banners available for the Cisco routers are: Message of the day banner Exec process creation banner Incoming terminal line banner Login banner

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