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Instructor & Todd Lammle. Sybex CCNA 640-802 Chapter 4: Cisco’s IOS and SDM. Chapter 4 Objectives. The Cisco router IOS Enhanced editing Administrative functions Hostnames Banners Passwords Interface descriptions Verifying your configuration. 2. Cisco Router IOS.

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Instructor & Todd Lammle

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instructor todd lammle
Instructor & Todd Lammle

Sybex CCNA 640-802

Chapter 4: Cisco’s IOS and SDM

chapter 4 objectives
Chapter 4 Objectives
  • The Cisco router IOS
  • Enhanced editing
  • Administrative functions
    • Hostnames
    • Banners
    • Passwords
    • Interface descriptions
  • Verifying your configuration


cisco router ios
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
connecting to a cisco router
Connecting To A Cisco Router

Cisco 2811

Cisco 1841

bringing up a router
Bringing up a Router
  • Boot-up process:


2: Looks for the Cisco IOS from Flash memory

3: 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
setup mode
Setup Mode
  • Basic Management Setup
  • Extended Setup
  • Command-Line Interface
command line interface cli
Command-Line Interface (CLI)
  • More flexible than setup mode.
  • To use the CLI, just say No to entering the initial configuration dialog.
logging into the router
Logging into the Router
  • User mode:
    • Router>
    • Used mostly to view statistics
  • Privileged mode:
    • Router#
    • Used to view & change router configuration
overview of router modes
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 configmem

Note: Any configuration changes need to be placed into RAM. Typing configmem or config net (from a TFTP host) will appendthe current running-config

  • CLI Prompts
  • Interfaces
  • Sub-interfaces
  • Line Commands
  • Routing Protocol Configurations
editing help features1
Editing & Help Features
  • Commands starting with a certain letter


clear clock configure connect copy

  • Enhanced Editing Commands
  • Router-Command History
  • Gathering Basic Routing Information
    • show version
administrative functions
Administrative Functions

The administrative functions that you can configure on a router and switch are

  • Hostnames
  • Banners
  • Password
  • Interface descriptions
hostnames descriptions
Hostnames & Descriptions
  • Hostnames

Router(config)#hostname todd


  • Descriptions

Atlanta(config)#int e0

Atlanta(config-if)#description Sales Lan

  • Purpose
  • Types
    • exec
    • incoming
    • login
    • motd
  • Delimiting character
setting the passwords
Setting the Passwords
  • 5 passwords:
    • 1st two used to set your enable password
      • Used to secure privileged mode; Router>enable
    • Other three are used to configure a password in user mode via:
      • console port
      • auxiliary port
      • Telnet
  • Enable passwords

Router(config)#enable password cisco

Router(config)#enable secret cisco

  • Auxiliary Password
  • Console Password
  • Telnet Password
  • Encrypting Your Password

Router(config)#service password-encryption

interface descriptions
Interface Descriptions

Setting descriptions on an interface is helpful to the administrator and, like the hostname, only locally significant. The description command is a helpful one because you can, for instance, use it to keep track of circuit numbers.

Here’s 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 interface command.

router interfaces
Router Interfaces
  • Bringing up an Interface

no shutdown


show interface

  • Configuring an IP Address on an Interface

Router(config)#int e0

Router(config-if)#ip address

Router(config-if)#no shut

  • Serial Interface Commands

clock rate & bandwidth (entered in kilobits)

viewing saving configurations
Viewing, & Saving Configurations
  • Viewing & Saving Configurations
    • running-configsaved in DRAM
    • startup-config saved in NVRAM

copy run start

sh run

sh start

erase startup-config

verifying your configuration
Verifying Your Configuration


  • show running-config
  • show startup-config
  • ping
  • show cdp nei detail
  • trace
  • telnet
other verification methods
Other Verification Methods
  • Verifying with the show interface command
    • Router#show interface ?
  • Verifying with the show ip interface command
    • Router#show ip interface
    • Router#show ip interface brief
    • Router#show controllers
  • Go through all the written labs and review questions
  • Review answers in class