Chapter4ccna

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Chapter4ccna

  1. 1. Sybex CCNA 640-802 Chapter 4: Cisco’s IOS and SDM Instructor & Todd Lammle
  2. 2. Chapter 4 Objectives • The Cisco router IOS • Enhanced editing • Administrative functions – Hostnames – Banners – Passwords – Interface descriptions • Verifying your configuration 2
  3. 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. 4. Connecting To A Cisco Router Cisco 2811 Cisco 1841
  5. 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. 6. Setup Mode • Basic Management Setup • Extended Setup • Command-Line Interface
  7. 7. Command-Line Interface (CLI) • More flexible than setup mode. • To use the CLI, just say No to entering the initial configuration dialog.
  8. 8. Logging into the Router • User mode: – Router> – Used mostly to view statistics • Privileged mode: – Router# – Used to view & change router configuration
  9. 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. 10. Configuration • CLI Prompts • Interfaces • Sub-interfaces • Line Commands • Routing Protocol Configurations
  11. 11. Editing & Help Features
  12. 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. 13. Enhanced Editing Commands
  14. 14. Enhanced Editing Commands (cont.)
  15. 15. Router Command History
  16. 16. Gathering Basic Routing Information
  17. 17. Administrative Functions The administrative functions that you can configure on a router and switch are • Hostnames • Banners • Password • Interface descriptions
  18. 18. Hostnames & Descriptions • Hostnames Router(config)#hostname todd todd(config)# • Descriptions Atlanta(config)#int e0 Atlanta(config-if)#description Sales Lan
  19. 19. Banners • Purpose • Types – exec – incoming – login – motd • Delimiting character
  20. 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. 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. 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. 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. 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. 25. Verifying Your Configuration Tools: – show running-config – show startup-config – ping – show cdp nei detail – trace – telnet
  26. 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. 27. Summary • Go through all the written labs and review questions • Review answers in class 27

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