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

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13.2 IOS levels and Ethernet

You already know from earlier sessions that there are multiple modes within the Cisco IOS and that each mode allows the user to execute different tasks. This section explains these modes in terms of hierarchical levels. It serves as a brief reminder of how to identify the current mode (or level) and then goes on to explore information stored about the router interfaces and how to interpret it.

Watch the video below, which is almost 6 minutes long.

IOS levels and Ethernet

Download this video clip.Video player: 71_iso_levels_and_the_ethernet.mp4
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Activity 2 Test yourself

a. 

This is not a Cisco router.


b. 

The router has a total of two interfaces.


c. 

This is a wireless interface.


d. 

The router probably has at least three network cards added.


e. 

Fast Ethernet is not being used on this router.


The correct answer is d.

d. 

Correct. The first number of the ID identifies the network card; the second number gives the identity of the interface on that card.


a. 

The IP addresses and subnet masks of all the router interfaces will be displayed.


b. 

A summary of the status of the router’s interfaces will be displayed.


c. 

A ‘% incomplete command’ message will be displayed.


d. 

A ‘% invalid input detected at ‘^’ marker’ will be displayed.


e. 

The router’s interface IDs and configured IP addresses are shown.


f. 

All the network IP addresses are shown.


The correct answers are b and e.

b. 

Correct. The status is shown as ‘up’ or ‘administratively down’.


e. 

Correct. Not all the network IP addresses are shown.