Sybex CCNA 640-802 Chapter 06

8/11/2019 Sybex CCNA 640-802 Chapter 06

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Sybex CCNA 640-802Chapter 6: Ciscos IOS

Instructor& Todd Lammle


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Chapter 6 Objectives

The Cisco router IOS

Enhanced editing

Administrative functions

Hostnames

Banners

Passwords

Interface descriptions

Verifying your configuration

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Cisco Router IOS

Carries network protocols and

functions

Connects high-speed traffic

between devices

Adds security to control access

Provides scalability for growth Supplies reliability


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Connecting To A Cisco Router

Cisco 2800

Cisco 1841


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Bringing up a Router

Boot-up process:1: POST

2: Looks for the Cisco IOS from Flash

memory3: IOS loads & looks for a valid

configuration;

startup-config

stored in nonvolatile RAM (NVRAM)

4: If a valid config is not found in NVRAM:

setup mode


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Setup Mode

Basic Management Setup

Extended Setup

Command-Line Interface


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Configuration

CLI Prompts

Interfaces

Sub-interfaces

Line Commands

Routing Protocol

Configurations


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Command-Line Interface (CLI)

More flexible than setup mode.

To use the CLI, just say No to

entering the initial configuration

dialog.


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Subinterfaces

Allow you to create logical

interfaces within the router

Router(config-

if)#interface f0/0.1

Router(config-subif)#


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Logging into the Router

User mode: Router>

Used mostly to view statistics

Privileged mode: Router#

Used to view & change router

configuration


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Overview of Router Modes

Global changes: config terminal or config t

Changes made to running-config

(DRAM) To change the startup-config(NVRAM)

config memory or config mem

Note: Any configuration changes need to

be placed into RAM. Typing config mem orconfig net (from a TFTP host) will append

the current running-config


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Editing & Help Features


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Editing & Help Features

Commands starting with a certainletter

Router#c?

clear clock configure connect copy

Enhanced Editing Commands

Router-Command History

Gathering Basic RoutingInformationshow version


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(cont.)


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Router Command History


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Gathering Basic Routing

Information


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Administrative Functions

The administrative functions that

you can configure on a router

and switch are

Hostnames

Banners

Password

Interface descriptions


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Hostnames & Descriptions

HostnamesRouter(config)#hostname todd

todd(config)#

DescriptionsAtlanta(config)#int e0

Atlanta(config-if)#description SalesLan


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Banners

Purpose

Types exec

incoming

login

motd

Delimiting character


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Setting the Passwords

5 passwords: 1st twoused to set your enable

password

Used to secure privileged mode;Router>enable

Other threeare used to configure a

password in usermode via:

console port

auxiliary port

Telnet


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Passwords

Enable passwordsRouter(config)#enable password cisco

Router(config)#enable secret cisco

Auxiliary Password

Console Password

Telnet Password

Encrypting Your PasswordRouter(config)#service password-

encryption


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Interface DescriptionsSetting descriptions on an interface is helpful to the

administrator and, like the hostname, only locallysignificant. The description command is a helpful one

because you can, for instance, use it to keep track of

circuit numbers.

Heres an example:

Atlanta(config)#int e0

Atlanta(config-if)#description Sales Lan

Atlanta(config-if)#int s0

Atlanta(config-if)#desc Wan to Miami circuit:6fdda4321

You can view the description of an interface

either with the show running-config

command or the show interfacecommand.


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Router Interfaces

Bringing up an Interfaceno shutdown

shutdown

show interface

Configuring an IP Address on anInterface

Router(config)#int e0

Router(config-if)#ip address 172.16.10.2255.255.255.0

Router(config-if)#no shut

Serial Interface Commandsclock rate & bandwidth (entered in

kilobits)


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Viewing, & Saving

Configurations

Viewing & Saving Configurationsrunning-configsaved in DRAM

startup-config saved in NVRAM

copy run startsh run

sh start

erase startup-config


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Summary

Go through all the written labs and review

questions

Review answers in class

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Sybex CCNA 640-802 Chapter 06