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coford | Cisco CCNA | Module 3 - Layer 2 Data Link

By: coford | Related Course: Cisco CCNA | Published: June 14, 2016 | Modified: June 15, 2016
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NotepadCisco study notes

  • Cisco has three types of memory
  • R.A.M.=Random access memory=is volatile- holds the running configuration- will not survive power outage must save work.
  • NV R.A.M.= NON-VOLATILE – holds the start-up config. (work saved).
  • Flash memory- hold operating system
  • router(>) is user mode – can only execute the (do) show command 
  • ?=help feature – will display all commands in user mode(>)
  • show ?= show all subcommands for the show command
  • enable(#)=priledge mode – enable level 15= is super user all access
  • level 1-14=are configurable can be assign to other devices
  • enable (#) mode give you more show commands
  • command disable take you back to user mode


Notepadstudy notes

  • configure terminal/config t=global configuration mode (config) #
  • Any changes made in global config mode will affect the device as a whole
  • type exit to go back to privilege mode, end or ctrl z
  • Assign device name – hostname (name)
  • No ip domain -lookup (DNS) – stop the device from broadcasting the net which can last for 60 seconds if you badly misspell a command (DOMAIN SERVICE REQUEST)
  • ctrl+shift+6 is break sequence
  • Set password -r1 (config) #enable password (password)
  • Set encrypted password- r1 (config) #enable secret (password)
  • Test change after every change


Notepadstudy notes

  • two ways to login into a device
  • Console port is one way to login to a device
  • to make changes to a port you must go into a port 
  • r1 (config) # line console 0 is how you login into the console port
  • r1 (config-line) # when changes are made it only effect people connected to the device on the console port. 
  • r1 (config-line) #exec-timeout command control how much time your device will automatic log out with no activity. Turn off this feature 0 0 (end)
  • r1 (config-line) # logging synchronous keep logging console messages for interrupting your typing. If not you will be typing at the end of the console message
  • (config-line) #password (password)- create a login password for the console port
  • exit take one mode at a time/end take back to privilege mode 
  • (config) #line vty- assign virtual port for remote access
  • (config) #line vty 0 15
  • (config-line) # exec-timeout- set log out for remote access for inactivity/ logging synchronous
  • to encrypt present and future passwords – service password- encryption
  • copy running-config startup config/copy run – to save work/write memory or wr


Notepadstudy notes

  • VALN is a layer 2 broadcast domain
  • each port on a switch is its own broadcast domain
  • two type of links or ports that can exist on a switch (access and trunking links
  • Access links- is any port on a switch that carries or is apart of one VLAN. by default, all ports belong to VLAN one.


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