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Chapter 4

Introduction to the Cisco IOS

(which is covered in Chapter 7), you use the configure network command,
or just config net.

However, you need to understand that for a router to actually make a

change to a configuration, it needs to put that configuration in RAM. So,
if you actually type config mem or config net, you'll replace the current
running-config with the config stored in NVRAM or a configuration stored
on a TFTP host. I'll be going over this in much greater detail in Chapter 7.

Configure

terminal, configure memory, and configure network are all consid-

ered commands that are used to configure information into RAM on a router;

however, typically only the configure terminal command is used.

CLI Prompts

It's really important that you understand the different prompts you can find
when configuring a router. Knowing these well will help you navigate and
recognize where you are at any time within configuration mode. In this sec-
tion, I'm going to demonstrate the prompts that are used on a Cisco router.
(Always check your prompts before making any changes to a router's con-
figuration!)

I'm not going into every different command offered. Doing that would be

reaching beyond the scope of this exam. Instead, I'm going to describe all the
different prompts you'll see throughout this chapter and the rest of the book.
These commands are the ones you'll use most in your real life--and the ones
you'll need to know for the exam.

Interfaces

To make changes to an interface, you use the interface command from
global configuration mode:

Router(config)#interface ?

Async Async interface

BVI Bridge-Group Virtual Interface

Dialer Dialer interface

FastEthernet FastEthernet IEEE 802.3

Group-Async Async Group interface

Lex Lex interface

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