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Instructor & Todd Lammle

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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  1. Instructor & Todd Lammle Sybex CCNA 640-802 Chapter 4: Cisco’s IOS and SDM

  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 Cisco 2811 Cisco 1841

  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: • 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 !

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