Configuring a Router: CLI Commands and Passwords
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Questions and Answers

What command is used to display the ARP table of the router?

  • show interface
  • show arp-table
  • display arp
  • show ip arp (correct)
  • What is the purpose of the 'service password-encryption' command in router configuration?

  • Changes the service password for router access
  • Displays passwords in plain text
  • Encrypts all passwords that are configured on the router (correct)
  • Decrypts encrypted passwords on the router
  • In the context of configuring a serial interface, what does the 'clock rate' command do?

  • Adjusts the interface speed
  • Syncs the clock with a server
  • Defines the clock rate for serial communication (correct)
  • Sets the clock time for the router
  • Which command is used to display the saved configuration located in NVRAM?

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

    What does CDP stand for in networking and what is its purpose?

    <p>Cisco Discovery Protocol - Obtains information about neighboring Cisco devices</p> Signup and view all the answers

    How can you create a backup copy of the router's configuration?

    <p>Using TFTP</p> Signup and view all the answers

    What is the purpose of the 'service password-encryption' command on a Cisco router?

    <p>It enables encryption for all passwords in the configuration</p> Signup and view all the answers

    Which command is used to display the current configuration in a Cisco router?

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

    What is the fastest way to restore an IOS image to a router from ROMmon mode?

    <p>Using TFTP download with tftpdnld command</p> Signup and view all the answers

    How can you check the environment variables set in the ROMmon environment?

    <p>Use the set command</p> Signup and view all the answers

    What is the purpose of the 'service password-encryption' command in router configuration?

    <p>It provides a weak encryption to all unencrypted passwords on the router.</p> Signup and view all the answers

    What is the purpose of the VTY port on a router?

    <p>To allow Telnet or SSH access to the device.</p> Signup and view all the answers

    When configuring a router, what is the key difference between 'enable password' and 'enable secret' commands?

    <p>'enable secret' uses a strong MD5 algorithm for encryption while 'enable password' shows passwords in clear text.</p> Signup and view all the answers

    What type of information does the 'show interfaces serial 0/1' command provide in a router?

    <p>Information specifically about the serial 0/1 interface</p> Signup and view all the answers

    Which command displays a history of commands that have been entered on a router?

    <p>show history</p> Signup and view all the answers

    Explain the difference between the 'enable password' and 'enable secret' commands when configuring a router for security.

    <p>The 'enable password' command stores the password in plain text, while the 'enable secret' command encrypts the password using a one-way hash.</p> Signup and view all the answers

    What is the significance of the VTY port on a router and how is it used in network configuration?

    <p>The VTY port on a router allows remote access for management and configuration purposes using protocols like Telnet or SSH.</p> Signup and view all the answers

    How can you display the current running configuration of a Cisco router, and why is it important to know this information?

    <p>The 'show running-config' command is used to display the current configuration, which is important for troubleshooting, verifying settings, and making changes.</p> Signup and view all the answers

    Explain the purpose of the 'clock rate' command in the context of configuring a serial interface on a router.

    <p>The 'clock rate' command is used to set the clock rate for DCE (Data Communications Equipment) serial interfaces to establish proper communication speed.</p> Signup and view all the answers

    What command is used to display the saved configuration located in NVRAM on a Cisco router, and why is it important to know this information?

    <p>The 'show startup-config' command is used to display the saved configuration, which is crucial for understanding the initial router settings and configurations.</p> Signup and view all the answers

    Study Notes

    CLI Command Modes

    • Two commands used to restrict access to privileged EXEC mode: enable password and enable secret
    • enable password: passwords shown in clear text in configuration files
    • enable secret: uses strong MD5 algorithm for encryption

    Configuring Router Passwords

    • service password-encryption: applies weak encryption to all unencrypted passwords
    • VTY (Virtual Teletype): a virtual port used for Telnet or SSH access to the device
    • VTY solely used for inbound connections to the device

    Examining Show Commands

    • show interfaces: displays statistics for all interfaces on a router
    • show clock: shows the time set in the router
    • show hosts: displays a cached list of host names and addresses
    • show users: displays all users who are connected to the router
    • show history: displays a history of commands that have been entered
    • show flash: displays information about flash memory and what IOS files are stored there
    • show version: displays information about the currently loaded software version along with hardware and device information

    Configuring Serial and Ethernet Interfaces

    • interface serial 0/0: configures a serial interface
    • clock rate 56000: sets the clock rate for the serial interface
    • no shutdown: enables the serial interface
    • interface Ethernet 0/0: configures an Ethernet interface

    Managing Configuration Files

    • copy and paste can be used to create a backup copy of the configuration
    • show running-config: displays the contents of the currently running configuration file
    • tftp can be used to manage configuration files
    • Environmental variables can be set to download an IOS image from a TFTP server using the tftpdnld command

    Cisco Discovery Protocol (CDP)

    • CDP is used to obtain information about neighboring Cisco devices
    • CDP Version 2 (CDPv2) is the most recent release of the protocol
    • CDP operates at the data link layer and allows two systems to learn about each other, even if they use different network layer protocols

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    Related Documents

    Topic4-Part II Modules3-5.pdf

    Description

    Learn about configuring a router using CLI commands, password protection, and encryption methods. Understand the differences between 'enable password' and 'enable secret', as well as how to use 'service password-encryption' for added security.

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