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Explore the network, Topology Diagrams, Intermediary Network Devices -…

- - - - ◦Basic routing and switching functions
      - ◦Reliable and secure access to network resources
      - ◦Network scalability
    - - Using a CLI on a Cisco IOS switch or router enables a network technician to
        
        ◦ Use a keyboard to run CLI-based network programs
        
        ◦ Use a keyboard to enter text and text-based commands
      - There are many distinct variations of Cisco IOS:
        
        ◦ IOS for switches, routers, and other Cisco networking devices
        
        ◦ IOS numbered versions for a given Cisco networking devices
      - Using a GUI enables a user to:
        
        ◦ Enter text and text-based commands
        
        ◦ Use a mouse to make selections and run programs
    - - Console port
        
        Out-of-band serial port used primarily for
        management purposes such as the initial configuration of the router.
      - Secure Shell (SSH)
        
        Inband method for remotely and securely establishing a CLI session over a network. User authentication, passwords, and commands sent over the network are encrypted.
      - Telnet
        
        Inband interfaces remotely establishing a CLI session through a virtual interface, over a network. User authentication, passwords, and commands are sent over the network in plaintext.
  - - - A Cisco IOS device supports many commands. Each IOS command has a specific format, or syntax, and can only be executed in the appropriate mode. The general syntax for a command, shown in the figure, is the command followed by any appropriate keywords and arguments.
        
        Keyword – This is a specific parameter defined in the operating system (in the figure, ip protocols).
        
        Argument – This is not predefined; it is a value or variable defined by the user (in the figure, 192.168.10.5).
        
        After entering each complete command, including any keywords and arguments, press the Enter key to submit the command to the command interpreter.
    - - A command might require one or more arguments. To determine the keywords and arguments required for a command, refer to the command syntax. The syntax provides the pattern, or format, that must be used when entering a command.
        
        ping ip-address – The command is ping and the user-defined argument is the ip-address of the destination device. For example,
        
        ping 10.10.10.5.
        traceroute ip-address – The command is traceroute and the user-defined argument is the ip-address of the destination device. For example, traceroute 192.168.254.254.
    - - Context Sensitive Help
        
        Command abbreviation and auto completion
        
        Recalling commands
        
        Context Sensitive Help command cheat sheet
    - - The IOS CLI provides hot keys and shortcuts that make configuring, monitoring, and troubleshooting easier.The following are worthy of special note:
        
        Down Arrow - Allows the user to scroll forward through former commands
        
        Up Arrow - Allows the user to scroll backward through former commands
        
        Tab - Completes the remainder of a partially typed command or keyword
        
        Ctrl-A - Moves to the beginning of the line
        
        Ctrl-E - Moves to the end of the line
        
        Ctrl-R - Redisplays a line
        
        Ctrl-Z - Exits the configuration mode and returns to user EXEC
        
        Ctrl-C - Exits the configuration mode or aborts the current command
        
        Ctrl-Shift-6 - Allows the user to interrupt an IOS process such as ping or traceroute
  - - - :
- - - - Devices
      - Media
      - Services
  - - - Glass or plastic fibers (fiber optic cable)-data is encoded as pulses of light
        
        Different types of network media have different features and benefits. Not all network media have the same characteristics, nor are they all appropriate for the same purpose.
      - Wireless transmission-data is encoded using wavelengths from the electromagnetic spectrum
      - Metallic wires within cables-data is encoded into electrical impulses