文档介绍：This chapter covers the following topics that you will need to master as NA:
• The IOS and Its User Interface This section examines the types of memory used
Brought to you by: by the IOS, in addition to mands used to examine and change the contents.
This section also describes the basic functions and help for mand-line
interface (CLI), and discusses how syslog messages are treated.
• Configuration Processes and the Configuration File The configuration file used
for a router contains all the configuration for that router. This section covers all
commands used to change the configuration and manipulate the configuration file.
• Managing IOS Images This section covers in detail the processes for upgrading
the IOS in Flash memory, as well as mands used to tell the router which IOS
Buy this book at: image to use. Password recovery is included as well.
Permission and Copyright
This material is reprinted from NA: Exam #640-507 Certification Guide, ©2000 by Cisco Press. Used with permission.
All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical,
including photocopying, recording, or by any information storage and retrieval system, without written permission from the publisher,
except for the inclusion of brief quotations in a review.
Page 21 Thursday, July 19, 2001 2:31 PM
C H A P T E R 2
Cisco work Operating
System (IOS) Fundamentals
NA exam requires that you understand the basics of the Cisco work
Operating System (IOS). In fact, the only operating system and user interface covered on
NA exam is the IOS and its user interface. The omission of other user interfaces, in
particular the Catalyst 5000/5500 series user interface, is one of the most important facts to
note when determining what to study for NA exam.
The IOS runs on some Cisco switch models and provides the familiar mand-line
interface (CLI). This chapter is geared toward the IOS C