Module 2 Notes

Week 2: Module 2: Subnetting VLANS & Cisco Commands

Review

• Classless routing allows all 0's and all 1s in a subnet id

  • subnet ID with n bits can support 2n different subnets

• Cisco IOS

  • Two versions of the config file
    • Startup-config: This is the last version that was saved. If the router/switch was restarted, this is the config that would load
    • Running-config: This is the version of the config currently running in memory. It has all of the config changes made at the command line since it was last saved.
  • To save running-config:
    • copy running-config startup-config
    • copy run start

• CIOS Command Modes

  • User EXEC Mode: Basic monitoring and status commands
  • router>
    • Privileged EXEC Mode: Administrative Access (think root)
    • router>#
      • Global Config Mode: Device-wide configuration settings
      • router(config)#
        • Interface Config Mode: Configure interface settings