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MOHAMED ILIYAS .S

Network Engineer & System Administrator.

HCL Learning Ltd .

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CISCO

What is Network Internet

Network :

Connection Between Different systems .

Internet :

Connection Between Different Network.

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CISCO

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CISCO

INTERNET

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CCNACISCO Certified Network Associates

CISCO is Computer Information System

Company.

The name "CISCO" for #1 networking

company actually is taken from the city name

San FranCISCO, CA. Cisco system inc.

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ROUTER

Its is hardware device

It is used to communicate different n/w

devices

It is routing device thats why it is called

Router

It is route the packet to the destination

It is maintain Routing Information Table

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Which Routers to Buy

Many companies are Manufacturing Router:

CISCO

NORTEL

MULTICOM

CYCLADES

JUNIPER

D-LINK

LINKSYS

But CISCO is having monopoly in the market of Routers

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Router Front view & Back view

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Router External Components

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Router Internal Components

ROM

RAM

NVRAM

FLASH

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Router Internal Components

ROM (Read Only Memory)

A bootstrap program is located here. Its is same

as the BIOS of the PC RAM (Random Access Memory)

It is known as temporary storage .Minimum size

of RAM is 2 MB.The size of RAM is greater than

NVRAM in the router

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Router Internal Components

NV RAM (NON-Volatile Random Access Memory)

It is similar to Hard disk . It is known as permanent

storage or startup configuration

FLASH

Internetwork Operating System (IOS) developed

by cisco is stored here.IOS is command line

Interface

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Router three major modes

Mode Name Use of the Mode

User mode -Initial mode

Privileged mode -Displays the commands

Global configuration mode -Configure mode

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Symbol of mode

User mode Router>

Privileged Mode Router#

Global Conf Mode Router(config)#

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Router Interfaces

Ethernet

Serial

We need to assign IP address on Ethernet

and serial port (Like name for identification

of interfaces)

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Router COMMANDS

Router>enable

Router#configure terminal

Router(config)#hostname US

US(config)#interface fastethernet 0/0

US(config-if)#ip address

US(config-if)#no shutdown

US(config)#exit

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Show COMMANDS

It will displays the interface details

Router#show ip interface brief

It will display the routing table information

Router#show ip route

It will show the running configuration file

Router#show running-config

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Routing Protocol

ROUTING PROTOCOLS are the software

That allow routers to dynamically advertise and learn

routes

Determine which routes are available and which are

the most efficient routes to a destination

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TYPES OF ROUTING PROTOCOL

RIP (Routing Information Protocol)

EIGRP (Enhanced Interior Gateway Routing

Protocol)

OSPF(Open Shortest Path First)

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