The document discusses Cisco router configuration and administration. It covers topics like the Cisco IOS, connecting to routers, router modes, editing features, administrative functions like hostnames, banners, and passwords, interface configuration, and verifying configurations. Administrative functions allow configuration of items like hostnames, banners to display messages, and passwords to control access. The Cisco IOS is loaded during boot-up and configurations can be viewed and saved.

1. Sybex CCNA 640-802
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
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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
Cisco 2811
Cisco 1841

5. Bringing up a Router
• Boot-up process:
1: POST
2: Looks for the Cisco IOS from Flash
memory
3: IOS loads & looks for a valid
configuration;
• startup-configstartup-config
• stored in nonvolatile RAM (NVRAM)
4: If a valid config is not found in NVRAM:
• setup modesetup mode

6. Setup Mode
• Basic Management Setup
• Extended Setup
• Command-Line Interface

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

8. Logging into the Router
• User mode:
– Router>
– Used mostly to view statistics
• Privileged mode:
– Router#
– Used to view & change router
configuration

9. Overview of Router Modes
• Global changes:
– config terminal or config t
– Changes made to running-configrunning-config
(DRAM)
– To change the startup-configstartup-config (NVRAM)
• config memory or config mem
Note: Any configuration changes need to
be placed into RAM. Typing config mem or
config net (from a TFTP host) will append
the current running-configrunning-config

10. Configuration
• CLI Prompts
• Interfaces
• Sub-interfaces
• Line Commands
• Routing Protocol
Configurations

11. Editing & Help Features

12. Editing & Help Features
• Commands starting with a
certain letter
Router#c?
clear clock configure connect copy
• Enhanced Editing Commands
• Router-Command History
• Gathering Basic Routing
Information
– show versionshow version

13. Enhanced Editing Commands

14. Enhanced Editing Commands
(cont.)

15. Router Command History

16. Gathering Basic Routing
Information

17. Administrative Functions
The administrative functions that
you can configure on a router
and switch are
• Hostnames
• Banners
• Password
• Interface descriptions

18. Hostnames & Descriptions
• Hostnames
Router(config)#hostname todd
todd(config)#
• Descriptions
Atlanta(config)#int e0
Atlanta(config-if)#description Sales
Lan

19. Banners
• Purpose
• Types
– exec
– incoming
– login
– motd
• Delimiting character

20. 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 useruser mode via:
• console port
• auxiliary port
• Telnet

21. Passwords
• 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

22. 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.

23. Router Interfaces
• Bringing up an Interface
no shutdown
shutdown
show interface
• Configuring an IP Address on an
Interface
Router(config)#int e0
Router(config-if)#ip address 172.16.10.2
255.255.255.0
Router(config-if)#no shut
• Serial Interface Commands
clock rate & bandwidth (entered in
kilobits)

24. Viewing, & Saving
Configurations
• Viewing & Saving Configurations
– running-configrunning-config saved in DRAM
– startup-configstartup-config saved in NVRAM
copy run start
sh run
sh start
erase startup-config

25. Verifying Your Configuration
Tools:
– show running-config
– show startup-config
– ping
– show cdp nei detail
– trace
– telnet

26. 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

27. Summary
• Go through all the written labs and review
questions
• Review answers in class
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