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Cisco Switches and Routers, The Cisco IOS Command Line, Connecting the…

- - - - use to monitor and make configuration changes over a network connection
      - at least one network interface must be connected to the network and have an IP address
      - Telnet, HTTP or SSH can be used to access a Cisco device
    - - requires direct connected to the console port
      - used to initially configure a network device
      - also useful when the network connectivity is not functioning
      - requires a terminal emulation client installed on the PC.
  - - - facilitates the basic operation of the device’s hardware components
      - stored in flash memory
    - - contains commands that initially configure a router and switch
      - running configuration file stored in RAM
      - startup configuration file is stored in NVRAM
- - - - Console
      - SSH
      - AUX port
- - - - italics -- Italic text indicates arguments for which you supply values.
      - [x] -- Square brackets indicate an optional element (keyword or argument)
      - {x} -- Braces indicate a required element (keyword or argument)
      - [x { y | z }] -- Braces and vertical lines within square brackets indicate a required choice within an optional element. Spaces are used to clearly delineate parts of the command
      - Boldface -- Boldface text indicates commands and keywords that you enter literally as shown
    - - Switch(config-if)# switchport port-security aging { static | time time | type {absolute | inactivity}}
  - - - Ctrl+K -- Erases all characters from the cursor to the end of the command line
      - Backspace -- Erases the character to the left of the cursor
      - Esc D -- Erases all characters from the cursor to the end of the word
      - Tab -- Completes a partial command name entry
      - Ctrl+U or Ctrl+X -- Erases all characters from the cursor back to the beginning of the command line
      - Ctrl+D -- Erases the character at the cursor
      - Ctrl+W -- Erases the word to the left of the cursor
      - Ctrl+A -- Moves the cursor to the beginning of the line
      - Left Arrow or Ctrl+B -- Moves the cursor one character to the left
      - Esc B -- Moves the cursor back one word to the left
      - Esc F -- Moves the cursor forward one word to the right
      - Right Arrow or Ctrl+F -- Moves the cursor one character to the right
      - Ctrl+E -- Moves the cursor to the end of command line
      - Up Arrow or Ctrl+P -- Recalls the previous command in the history buffer, beginning with the most recent command
      - Down Arrow or Ctrl+N -- Goes to the next line in the history buffer
      - Ctrl+R or Ctrl+I or Ctrl+L -- Redisplays the system prompt and command line after a console message is received
- - - - Privileged EXEC Mode
        
        Higher config modes, like global config mode, can only be reached from this mode
        
        privileged EXEC mode can be identified by # symbol
        
        used to execute configuration commands
        
        Mode allows access to all commands and features
      - User EXEC Mode
        
        does not allow the execution of any commands that might change the config
        
        EXEC mode is identified by > symbol
        
        only a limited number of basic monitoring commands
        
        It is often referred to as “view-only" mode
        
        limited capabilities but is useful for basic ops
- - - - Verify the list of known hosts on the local Ethernet LANs.
    - - Verify the Layer 3 routing information.
    - - Verify the Layer 3 information of an interface.
    - - Verify which protocols are operational.
    - - Verify the interface status and see if there are any error messages.
    - - Verify the memory, interfaces, and licenses of the device.
    - - Verify the current configuration and settings.
- - - - Config Device Name:
        
        hostname <name>
      - Secure user EXEC mode:
        
        line console 0
        
        Password <password>
        
        login
      - Secure remote Telnet / SSH access:
        
        line vty 0 15
        
        Password <password>
        
        Login
      - Secure privileged EXEC mode:
        
        enable secret <password>
      - Secure all passwords in the config file:
        
        service password-encryption
      - Provide legal notification:
        
        banner motd delimiter message delimiter
      - Configure the management SVI:
        
        interface vlan 1
        
        ip address ip-address subnet-mask
        
        no shutdown
      - Save the Configuration:
        
        copy running-config start-config
- - - - R1(config)# enable secret class
        R1(config)#
        R1(config)# line console 0
        R1(config-line)# password cisco
        R1(config-line)# login
        R1(config-line)# exit
        R1(config)#
        R1(config)# line vty 0 4
        R1(config-line)# password cisco
        R1(config-line)# login
        R1(config-line)# transport input ssh telnet
        R1(config-line)# exit
        R1(config)#
        R1(config)# service password-encryption
        R1(config)#
- - - - Switch(config)# line cty 0 15
        
        Switch(config-line)# password password
        
        Switch(config-line)# transport input ssh
        
        Switch(config-line)# login
    - - Switch(config)# line console 0
        
        Switch(config-line)# password password
        
        Switch(config-line)# login