1. Instructor & Todd Lammle
Sybex CCNA
Chapter 4: Cisco’s IOS and SDM
Instructor & Todd Lammle

2. Chapter 4 Objectives The Cisco router IOS Enhanced editing
Administrative functions
Hostnames
Banners
Passwords
Interface descriptions
Verifying your configuration 2

3. 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

4. Connecting To A Cisco Router

5. Bringing up a Router
There are four major phases to the bootup process:
1. Performing the POST
2. Loading the bootstrap program
3. Locating and loading the Cisco IOS software
4. Locating and loading the startup configuration file or entering setup mode

6. Bringing up a Router 1. Performing the POST Power-On Self Test (POST)
When the router is powered on, software on the ROM chip conducts the POST.
During this self-test, the router executes diagnostics from ROM on several hardware components including the CPU, RAM, and NVRAM.
After the POST has been completed, the router executes the bootstrap program.

7. Bringing up a Router 2. Loading the Bootstrap Program
After the POST, the bootstrap program is copied from ROM into RAM.
Once in RAM, the CPU executes the instructions in the bootstrap program.
The main task of the bootstrap program is to locate the Cisco IOS and load it into RAM.

8. Bringing up a Router 3. Locating and Loading Cisco IOS
The IOS is typically stored in flash memory.
Note: Once the IOS begins to load, you may see a string of pounds signs (#) while the image decompresses.
############################

9. Bringing up a Router 4. Locating and Loading the Configuration File
Bootstrap program searches for the startup configuration file, known as startup-config, in NVRAM.
file is copied into RAM as the running configuration file, running-config.
If the startup configuration file can not be located, then we enter setup mode.

10. Memory ROM : bootstrap Flash Memory : Cisco IOS
NVRAM : permanent storage for the startup configuration file (startup-config)
If we made changes then we must save it to the NVRAM

11. Remember
every interface on the router is a member or host on a different IP network.
Each interface must be configured with an IP address and subnet mask of a different network.

12. Command-Line Interface (CLI)
More flexible than setup mode.
To use the CLI, just say No to entering the initial configuration dialog.

13. Modes User mode: Privileged mode: Global configuration mode.
Router>
Used mostly to view statistics
Privileged mode:
enable
Router#
Used to view & change router configuration
Global configuration mode.
config terminal or config t
Router (config)#

14. Configuration certain basic tasks are performed including:
Naming the router
Setting passwords
Configuring interfaces
Configuring a banner
Saving changes on a router
Verifying basic configuration and router operations

15. Configuration Naming the router Setting passwords Privileged mode
Console , Telnet

16. Configuration
Banner
Saving changes

17. Configuration Interface configuration
Try network address, incorrect mask ?

18. Showing the work
Lets try it out !