Cisco IOS

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Cisco Internetwork Operating System (IOS) is a family of network operating systems used on many Cisco Systems routers and current Cisco network switches


Basic commands[edit]

Interfaces[edit]

  • interface Te1/0/1
  • show ip [OPTION]
  • show ip interface
    • show ip interface brief or sh ip int br
  • enable Logs into enable mode. Also known as user exec mode or privileged mode. See also: show privilege
    • enable 5 Change to level 5
    • no enable password
  • show ip traffic
  • show tcp brief





  • show process
  • ip domain lookup
  • no ip domain lookup
  • ip domain-lookup
  • no ip domain-lookup


  • ip host HOSTNAME xx.xx.xx.xx (Similar to /etc/hosts)
  • [no] ip forward-protocol nd


  • ip route-cache
  • no ip route-cache
  • include, similar to grep linux command

VLAN[edit]

show ip[edit]

Stacking[edit]

Users[edit]


IOS: Access List (ACLs)

HTTP Server[edit]

  • sh ip http server all
  • R1(config)#ip http server
  • R1(config)#ip http authentication local
  • R1(config)#ip http secure-server

DHCP Server[edit]

Configuration Guides[edit]

Activities[edit]

  1. Read Cisco IOS command reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/fundamentals/command/Cisco_IOS_Configuration_Fundamentals_Command_Reference.pdf
  2. Read Cisco IOS Cheat Sheet: https://www.netwrix.com/cisco_commands_cheat_sheet.html
  3. Configure a user with public key access Configure public RSA key authentication
  4. Associate a user with default higher privileges using username command
  5. Create a new VLAN


Related terms[edit]

See also[edit]


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