CONFIGURING A NETWORK OS

Chapter 2Intro to Routing & Switching

OBJECTIVESUpon completion of this chapter you will be able to: Explain the purpose of Cisco IOS. Explain how to access and navigate Cisco IOS to

configure network devices. Describe the command structure of Cisco IOS software. Configure hostnames on a Cisco IOS device using the

CLI. Use Cisco IOS commands to limit access to device

configurations. Use Cisco IOS commands to save the running

configuration. Explain how devices communicate across network

media. Configure a host device with an IP address. Verify connectivity between two end devices.

YOUR HOME NETWORK

BUSINESS NETWORK

CISCO IOS2.1.1

IOS Cisco Internetwork Operating System

(IOS)On all Cisco devices

Stored on flash/flash memory cardNon-volatileStays w/out powerCan be overwritten & upgraded

When powered, copied from flash & runs in RAM

ACCESSING THE IOS Take a look at the router

How do you think we can access the IOS?

ACCESSING THE IOS2.1.2

CONSOLE PORT Out-of-band management

Means direct maintenance access only Can access when nothing is configured

yet Need a computer w/ terminal emulation

software & console cable Assign a password to it!

TELNET, SSH, AUX Telnet

Remote accessPlain-text passwordOne active interface must be configured

Secure Shell (SSH)Remote access w/ encryption

Aux PortOut-of-band connection/maintenanceUses telephone lineCan be used like console port

ACTIVITY

REVIEW What does IOS stand for?

Internetwork Operating System Where is the IOS stored on a Cisco

router & switch? In flash memory

When a router or switch boots up, it loads the IOS from where to where?Flash to RAM

What port will you most likely connect to for 1st time config & direct maintenance?Console

NAVIGATING THE IOS

2.1.3

USER & PRIVILEGED MODES

GLOBAL CONFIG MODE

GETTING BETWEEN MODES Router> enable (en) Router# configure terminal (config t) Router (config)# interface xxx (int) Router (config-if)# Router (config-line)#exit (goes back one

mode) Ctrl+Z or end= takes back to privileged Switch# disable (goes back to user)

REVIEW

OOPS…I MADE A MISTAKE

SHORTCUTS Tab - Completes the remainder of a partially typed

command or keyword Ctrl-R - Redisplays a line Ctrl-A – Moves cursor to the beginning of the line Ctrl-Z - Exits configuration mode and returns to user EXEC Down Arrow - Allows the user to scroll forward through

former commands Up Arrow - Allows the user to scroll backward through

former commands Ctrl-Shift-6 - Allows the user to interrupt an IOS process

such as ping or traceroute. Ctrl-C - Aborts the current command and exits the

configuration mode Enter- displays next line Space bar- displays next page

SHOW COMMANDS Provide info only Different commands in different modes

show startup-config (show start)Displays the saved configuration located in

NVRAM. show running-config (show run)

Displays the contents of the currently running configuration file.

SHOW VERSION

LABS 2.1.4.8

Navigating the IOSPacket Tracer

2.1.4.9Establishing a Console Session with Tera

Term

NOTES ON TERMINAL EMULATION What are the settings in a terminal

emulation program to access the CLI?

REVIEW

GETTING BASIC2.2.1

WHAT WE’LL DO… Create a two PC network connected via

a switch Setting a name for the switch Limiting access to the device

configuration Configuring banner messages Saving the configuration

HOSTNAMES What are the default hostnames?

CONFIGURE HOSTNAME Must be in privileged mode

LIMIT ACCESS TO DEVICE Secure location Set passwords

END OF DAY 3

PASSWORD TIPS We’ll use cisco & class

Use passwords that are more than 8 characters

Use combination of upper & lowercase letters, numbers, special characters

Avoid using the same password for all devices

Avoid using common words such as password or administrator

END OF DAY 3

SET PASSWORDS In Packet Tracer, complete:

Privileged enable password (cisco)Privileged enable secret password (class)Console password (cisco)VTY password (cisco)Banner MOTDEncrypt all passwords

Then verify all passwords are encrypted by show run

SAVING CONFIGURATIONS

2.2.3

CONFIGURATION FILES

LAB 2.2.3.3 Configuring a Switch You will perform basic switch

configurations.You will secure access to the command-line

interface (CLI) and console ports using encrypted and plain text passwords.

You will also learn how to configure messages for users logging into the switch. These banners are also used to warn unauthorized users that access is prohibited.

ACTIVITY

REVIEW What mode do you need to be in to

make configuration changes?

If you erase the startup-config, what else will you need to do in order to return the device to factory default?

ADDRESSING SCHEMES

2.3

IP ADDRESSING All end devices have an IP address IPv4- 192.168.10.25 255.255.255.0

4 octets0-255 in eachSubnet mask is included with it

HOME NETWORK

CONFIGURE SWITCH ADDRESS Virtual interface Allows remote access

LAB 2.3.2.5

You will first perform basic switch configurations. Then you will implement basic connectivity

by configuring IP addressing on switches and PCs.

When the IP addressing configuration is complete, you will use various show commands to verify configurations and use the ping command to verify basic connectivity between devices.

TESTING Ping

Remote device or device you connect to PC to switch PC to PC

127.0.0.1 tests TCP/IP on you

END OF DAY 4

LAB Build & configure a small network in

Packet Tracer

Configure a switch & test it

REVIEW & STUDY Complete the study guide handout

Take the quiz on netacad.com

Jeopardy review

SUMMARYIn this chapter, you learned: Services provided by the Cisco IOS

accessed using a CLI• Accessed by the console port, the AUX

port, or through telnet or SSH• Can make configuration changes to Cisco

IOS devices• A network technician must navigate

through various hierarchical modes of the IOS

Cisco IOS routers & switches use a similar IOS

SUMMARY Introduced the initial settings of a Cisco

IOS switch device• Setting a name• Limiting access to the device configuration• Configuring banner messages • Saving the configuration

CONFIGURING A NETWORK OS

Chapter 2Intro to Routing & Switching