Skip to main content

About this free course

Download this course

Share this free course

Discovering computer networks: hands on in the Open Networking Lab
Discovering computer networks: hands on in the Open Networking Lab

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

13.1 The command line and operating system

You were introduced to the Cisco CLI (command-line interface) in an earlier session, but you may have met some things there that you found a little baffling. In this part you’ll look at the CLI in greater detail and unravel some of its mysteries.

Watch the video below, which is a little over 3 minutes long. This video introduces you to the Cisco operating system and explains what happens when it is booted up.

The command line and the operating system

Download this video clip.Video player: 70_the_command_line_and_the_operating_system_edit.mp4
Copy this transcript to the clipboard
Print this transcript
Show transcript|Hide transcript
 
Interactive feature not available in single page view (see it in standard view).

Activity 1 Think about

5 minutes

  • 1. The following output shows part of a response to the command show ip interface brief. Explain what is meant by the term ‘unassigned’ in the IP address column.

    Router>enable

    Router#show ip interface brief

    Interface IP-Address OK? Method Status Protocol

    GigabitEthernet0/0 192.168.1.2 YES manual up up

    GigabitEthernet0/1 unassigned YES unset administratively down down

    GigabitEthernet0/2 unassigned YES unset administratively down down

    Vlan1 unassigned YES unset administratively down down

    Router#

  • From the output, you should have noticed that for the interface GigabitEthernet0/0 there was an IP address in the ‘IP-Address’ column. From this you should have been able to deduce that ‘unassigned’ simply means that an IP address hasn’t yet been configured on those interfaces that ‘unassigned’ appears alongside.

  • 2. Which of the following are Cisco IOS functions?

  • a. 

    Checking the router hardware


    b. 

    Loading the config file


    c. 

    Sending a ping to all connected devices


    d. 

    Loading any default settings if there is no config file


    e. 

    Enabling a config file to be created and saved


    f. 

    Warning the user of any security threat.


    The correct answers are a, b, d and e.