Cisco IOS CLI and Shells Overview
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Questions and Answers

Which type of interface allows users to manipulate computers via graphical elements such as windows and menus?

  • Command-line interface (CLI)
  • Graphical user interface (GUI) (correct)
  • Shell interface
  • Application programming interface (API)

    • What does the term 'shell' refer to in the context of configuring network devices?

  • A type of network protocol used for security
  • A database storing device configurations
  • The interface between the user and the operating system (correct)
  • The physical components of a computer system

    • How can users connect to the CLI of a Cisco device?

  • Remotely via SSH only
  • Using the console port for direct access (correct)
  • By implementing third-party software tools
  • Through a web-based interface exclusively

    • What happens to the running-config file when the device boots up?

    <p>It is erased permanently.</p> Signup and view all the answers

    Which command is effective for copying the running-config to startup-config?

    <p>write memory</p> Signup and view all the answers

    What occurs if no startup-config file is present on a new device?

    <p>The device defaults to factory-default configuration.</p> Signup and view all the answers

    How does the enable password differ from the enable secret?

    <p>Enable password is stored in cleartext.</p> Signup and view all the answers

    Which command will return a device to its factory-default configuration?

    <p>erase startup-config</p> Signup and view all the answers

    What does the 'service password-encryption' command accomplish?

    <p>It encrypts current and future passwords.</p> Signup and view all the answers

    What does a password stored with a type 7 encryption signify?

    <p>It is easily reversible.</p> Signup and view all the answers

    What command would you use to view the enable password in running-config?

    <p>show running-config | include enable</p> Signup and view all the answers

    What does the enable password command accomplish in global configuration mode?

    <p>It configures a password for privileged EXEC mode.</p> Signup and view all the answers

    Which of the following is not a command for deleting startup-config?

    <p>delete startup-config</p> Signup and view all the answers

    Which mode must you be in to configure the enable password?

    <p>Global configuration mode</p> Signup and view all the answers

    What is the major risk associated with storing the enable password?

    <p>It is visible in running-config as cleartext.</p> Signup and view all the answers

    Which command is used to return to user EXEC mode from privileged EXEC mode?

    <p>disable</p> Signup and view all the answers

    What is the primary reason for using the enable secret over the enable password?

    <p>The enable secret is stored as a hash for increased security.</p> Signup and view all the answers

    Which hashing algorithm is mentioned as being the default for some newer devices?

    <p>scrypt</p> Signup and view all the answers

    What happens immediately after you execute the command 'hostname R1'?

    <p>The prompt changes to R1.</p> Signup and view all the answers

    What happens when both the enable password and the enable secret are configured?

    <p>Only the enable secret can be used.</p> Signup and view all the answers

    What command is used to save the running-config to the startup-config?

    <p>copy running-config startup-config</p> Signup and view all the answers

    Which keyboard shortcut is used to return to privileged EXEC mode without executing the current command?

    <p>Ctrl-C</p> Signup and view all the answers

    What command allows you to execute EXEC mode commands from global configuration mode?

    <p>do</p> Signup and view all the answers

    Which command allows a user to enter global configuration mode?

    <p>configure terminal</p> Signup and view all the answers

    What is the format of the prompt in user EXEC mode?

    <p>hostname&gt;</p> Signup and view all the answers

    If you wanted to delete all characters to the left of the cursor in the command line, which shortcut would you use?

    <p>Ctrl-U</p> Signup and view all the answers

    What must be done to return to privileged EXEC mode from global configuration mode?

    <p>both A and D</p> Signup and view all the answers

    If Ctrl-Z is pressed while typing a command, what action does this perform?

    <p>Executes the command and exits to privileged EXEC mode.</p> Signup and view all the answers

    Which symbol is used in the CLI to access context-sensitive help?

    <p>?</p> Signup and view all the answers

    What is one characteristic of the enable password?

    <p>It is stored in cleartext by default.</p> Signup and view all the answers

    What is indicated by the marker '^' when an error is detected in command input?

    <p>The location of the error in the command.</p> Signup and view all the answers

    Which command is used to enable password encryption on the Cisco IOS?

    <p>service password-encryption</p> Signup and view all the answers

    Which command would revert a device’s hostname to its default setting?

    <p>no hostname R1</p> Signup and view all the answers

    When configuring network devices, which command is recommended for securing access to privileged EXEC mode?

    <p>enable secret</p> Signup and view all the answers

    How does hashing differ from encryption in the context of securing passwords?

    <p>Hashing cannot be reversed, while encryption can be.</p> Signup and view all the answers

    In global configuration mode, what happens if you enter the command 'show clock'?

    <p>It shows an error due to the command's invalid context.</p> Signup and view all the answers

    Which command would you use to revert to factory-default configuration on a Cisco device?

    <p>erase startup-config</p> Signup and view all the answers

    Which command provides a list of commands available in the current execution or configuration mode?

    <p>?</p> Signup and view all the answers

    What is the purpose of the command 'do' in global configuration mode?

    <p>To execute EXEC mode commands from configuration mode.</p> Signup and view all the answers

    Which command would you use to navigate to the beginning of the command you are typing?

    <p>Ctrl-A</p> Signup and view all the answers

    Which of the following describes the storage location of the running-config?

    <p>Stored in RAM.</p> Signup and view all the answers

    What does the 'exit' command do if executed from global configuration mode?

    <p>Returns to privileged EXEC mode.</p> Signup and view all the answers

    What is an effect of using the command 'do show clock' in global configuration mode?

    <p>It will display the current time without exiting configuration mode.</p> Signup and view all the answers

    Which method is NOT used to access the CLI of a Cisco device?

    <p>Connecting through a web browser</p> Signup and view all the answers

    What is the primary function of a terminal emulator in relation to Cisco devices?

    <p>To replicate the functions of a computer terminal</p> Signup and view all the answers

    Which of the following settings is NOT typically configured when using a terminal emulator to connect to a Cisco device?

    <p>Screen resolution</p> Signup and view all the answers

    For a successful connection using the RJ45 console port, which type of cable must be used?

    <p>Rollover cable</p> Signup and view all the answers

    What is the typical speed setting for a console connection in PuTTY for Cisco devices?

    <p>9600 bits per second</p> Signup and view all the answers

    How do the pin connections in a rollover cable differ from those in a straight-through cable?

    <p>They cross wiring between both ends</p> Signup and view all the answers

    Which CLI feature is essential when devices send data faster than the receiver can manage?

    <p>Flow control</p> Signup and view all the answers

    When configuring a console connection, which of the following pieces of information is NOT required?

    <p>Hostname of the device</p> Signup and view all the answers

    Which connection method allows communication over the network to the Cisco device?

    <p>Telnet or SSH</p> Signup and view all the answers

    What is the main advantage of using the CLI over the GUI for configuring Cisco devices?

    <p>It allows for more detailed configurations without external tools</p> Signup and view all the answers

    What type of port is specifically used to configure a Cisco device via console?

    <p>Console port</p> Signup and view all the answers

    What should you do once you have physically connected the PC to the Cisco device's console port?

    <p>Launch a terminal emulator application</p> Signup and view all the answers

    Which of the following connectors is common on Cisco devices for console communication?

    <p>USB Mini-B</p> Signup and view all the answers

    What is the purpose of the user EXEC mode in Cisco's IOS?

    <p>To allow basic commands for viewing device information.</p> Signup and view all the answers

    Which command is used to exit the system configuration dialog?

    <p>no</p> Signup and view all the answers

    What is indicated by the greater-than sign in the CLI prompt?

    <p>The device is in user EXEC mode.</p> Signup and view all the answers

    Which command would you use to access privileged EXEC mode from user EXEC mode?

    <p>enable</p> Signup and view all the answers

    What does the prompt change to when in privileged EXEC mode?

    <p>Router#</p> Signup and view all the answers

    To enter global configuration mode, which command should be used from privileged EXEC mode?

    <p>configure terminal</p> Signup and view all the answers

    Which mode is primarily used for in-depth device configuration?

    <p>Global configuration mode</p> Signup and view all the answers

    What is the first step to perform before using the reload command?

    <p>Access privileged EXEC mode.</p> Signup and view all the answers

    How can a user switch from privileged EXEC mode back to user EXEC mode?

    <p>disable</p> Signup and view all the answers

    What does typing a question mark after a command do?

    <p>Lists the available keywords for the command.</p> Signup and view all the answers

    What happens when you press Enter after typing a command that is ambiguous?

    <p>An error message is displayed.</p> Signup and view all the answers

    When typing a command, what is the purpose of pressing the Tab key?

    <p>To auto-complete the command if it is unique.</p> Signup and view all the answers

    What is the primary purpose of the running-config file in Cisco IOS?

    <p>To determine the current operational configurations of the device.</p> Signup and view all the answers

    What command is used to view the startup configuration of a Cisco device?

    <p>show startup-config</p> Signup and view all the answers

    How does the startup-config file differ from the running-config file?

    <p>It stores configurations that persist after a device reboot.</p> Signup and view all the answers

    When you type 'show clock ?' in the CLI, what do you expect to see?

    <p>Available keywords to provide more information about the clock.</p> Signup and view all the answers

    What does the pipe (|) symbol do in the context of commands?

    <p>It can filter command outputs.</p> Signup and view all the answers

    Which command would auto-complete if you type 'en' and press Tab?

    <p>enable</p> Signup and view all the answers

    What can you do if you want to see a list of subcommands associated with a command?

    <p>Add a question mark after the command.</p> Signup and view all the answers

    Study Notes

    Cisco IOS CLI

    • The Cisco IOS CLI is used to configure network devices.
    • It is a text-based interface, unlike a GUI.
    • Practical experience is essential for mastering network configuration.

    Shells

    • A shell is a program that facilitates user interaction with a computer.
    • Two main types exist: GUI (graphical user interface) and CLI (command-line interface).
    • GUIs are user-friendly and widely used.
    • CLIs use text commands for device control.
    • A Cisco Wireless LAN Controller (WLC) GUI is relevant to the CCNA exam.
    • The Windows Command Prompt is a well-known CLI.
    • The CCNA exam requires familiarity with Cisco IOS CLI for Cisco routers and switches.

    Accessing the CLI

    • Two common methods to access a Cisco device's CLI:
      • Connecting to the console port with a console cable (physical connection)
      • Connecting over the network with Telnet or SSH (network connectivity).
    • Console ports support physical connections, not network communications.
    • Console cables use specific wiring (rollover) for RJ45 ports.
    • Terminal emulators (like PuTTY) translate computer input to the device's CLI.
    • Terminal emulator settings, such as speed and data bits, vary depending on the device.
    • Cisco Packet Tracer provides hands-on Cisco CLI practice.

    • Cisco IOS command hierarchy includes EXEC modes (user and privileged) and configuration modes (like global).

    • User EXEC mode provides basic device information.

    • User EXEC prompt format: hostname>

    • Privileged EXEC mode prompt format: hostname#

    • Privileged EXEC mode accessed with the enable command.

    • Reloading a device is possible from privileged EXEC mode but not user EXEC mode.

    • Global configuration mode accessed with configure terminal.

    • Global configuration mode prompt format: hostname(config)#

    • Changing a device's hostname with hostname command.

    • Undoing a command: Prefix the command with no.

    • Returning to privileged EXEC mode from configuration modes: use end, exit, Ctrl-C, or Ctrl-Z.

    • do command allows execution of EXEC commands from configuration mode.

    • Keyboard shortcuts for cursor movement and command editing (Left/Right arrow, Backspace, Ctrl-A, Ctrl-E, Ctrl-U).

    • Previous commands are stored for recall (Up/Down arrow).

    Context-sensitive help

    • The "?" character offers context-sensitive help.
    • "?" lists available commands in the current mode.
    • "command ?" lists possible keywords for a command.
    • "? command" lists available options within a command.
    • Partial commands enable auto-completion with the Tab key.
    • Partial commands also execute if only one option matches.

    Configuration Files

    • Cisco devices use running-config (current) and startup-config (persistent) files.
    • Running-config is in RAM and is lost after reboot.
    • Startup-config is in NVRAM and is retained.
    • Writing running-config to startup-config: write, write memory, copy running-config startup-config.
    • Returning to factory defaults: erase startup-config files accompanied by reboot.

    Password-protecting Privileged EXEC Mode

    • Enable password: A password for accessing privileged EXEC mode.
    • Enable password is stored in cleartext (not secure).
    • Service password-encryption command obscures passwords (weak encryption, easily reversed).
    • Enable secret: More secure than enable password, stores passwords using a hash (one-way).
    • Enable secret command hashes passwords. (Using type 9 (scrypt) is secure).

    Key takeaway

    • Understanding practical use of the Cisco IOS CLI is crucial for the CCNA exam.
    • Mastering various commands and modes is essential.

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    Quiz Team

    Description

    This quiz explores the Cisco IOS Command-Line Interface (CLI) and the concept of shells in computing. It covers the basics of accessing the CLI and the differences between GUI and CLI. Understanding these concepts is crucial for anyone preparing for the CCNA exam.

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