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The next mode is interface mode and it displays the following, hostname, config-if

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and brackets followed by hash or pound sign hostname(config-if)#

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This mode allows you to change the configuration of an individual interface.

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So for example you can change the IP address of the routers F0/0 interface

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or you could disable the interface by shutting it down or enable the interface

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by using the no shutdown command.

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So various options are available in interface mode and commands available

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will depend on the type of interface that you’re configuring.

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A Ethernet interface would have a different options to a serial interface

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which would be different in turn to a DSL interface or ATM interface.

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So I can type int f0/0 which is interface FastEthernet 0/0 on this router

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as you can see I’m abbreviating commands and it's good practice to do that.

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As always remember you can hit the tab key which will complete a command for you.

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So if I type exit to go back to privilege mode

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and then type int and press tab notice the command is completed and now want to use

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question mark I can see a list of available interface types.

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So in the output I can see FastEthernet, loopback, serial interfaces and others.

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I could then type f press tab which completes the command.

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So fastethernet, press question mark and I can see the options

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in this example I need to specify 0, so I can type 0?

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And then told to enter forward slash and then i need to enter 0, so interface fastethernet
0/0

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Notice how the Cisco IOS helps you complete commands.

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It gives you relevant information about which options or parameters are available.

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In the interface configuration mode I could use question mark.

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Once again to see a list of options.

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These options are specific to this mode and specifically this type of interface.

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So I’m gonna type i?

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And I can see various options including IP, IPV6, ISIS, and ISO-IGRP.

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In this example I'm gonna specify ip ? and I can see options that pertain

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or that are relevant to IP so I could choose IP address.

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notice the options a? is new list of options

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I can’t use ad cause there are multiple options

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for that, so I have to specify add and now when I press tab

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the command completes because that’s the only option available.

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I could now specify an IP address for this interface.

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notice I'm being prompted for the relevant information  N

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so if I go back again by pressing backspace and then use question mark of the IP address

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I’m prompted to enter the IP address and subnet mask.

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It prompts me for an IP address and after the IP address I'm prompted for the subnet mask.

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If I press enter without completing a command, I'm told that the command is incomplete

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I can use ctrl p or the up arrow key to display the previously entered command

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and now I can enter the mask but if I enter the mask incorrectly

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and press enter I'm told that the mask is invalid.

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So press the up key, correct the mask and now when I press enter. the command is accepted.