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Cisco IOS 12.4 安全配置指南
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IOS 12.4中所有安全配置的指南。Security CCIE的参考书籍。
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THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL
STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT
WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.
THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT
SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE
OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.
The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public
domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.
NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH
ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING, WITHOUT
LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF
DEALING, USAGE, OR TRADE PRACTICE.
IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING,
WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO
OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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trademarks; Changing the Way We Work, Live, Play, and Learn and Cisco Store are service marks; and Access Registrar, Aironet, AsyncOS, Bringing the Meeting To You,
Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, CCVP, Cisco, the Cisco
Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems,
Cisco
Systems Capital, the Cisco Systems logo, Cisco Unity, Collaboration Without Limitation, EtherFast, EtherSwitch, Event Center, Fast Step, Follow Me Browsing,
FormShare, GigaDrive, HomeLink, Internet Quotient, IOS, iPhone, iQ Expertise, the iQ logo, iQ
Net Readiness Scorecard, iQuick Study, IronPort, the IronPort logo,
LightStream, Linksys, MediaTone, MeetingPlace, MeetingPlace Chime Sound, MGX, Networkers, Networking Academy, Network Registrar, PCNow, PIX, PowerPanels,
ProConnect, ScriptShare, SenderBase, SMARTnet, Spectrum Expert, StackWise, The Fastest Way to Increase Your Internet Quotient, TransPath, WebEx, and the
WebEx
logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.
All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship
between Cisco and any other company. (0807R)
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the
document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
Cisco IOS Security Configuration Guide
© 2008 Cisco Systems, Inc. All rights reserved.
i
About Cisco IOS and Cisco IOS XE Software
Documentation
Last updated: December 10, 2008
This document describes the objectives, audience, conventions, and organization used in Cisco IOS and
Cisco
IOS XE software documentation, collectively referred to in this document as Cisco IOS
documentation. Also included are resources for obtaining technical assistance, additional
documentation, and other information from Cisco. This document is organized into the following
sections:
• Documentation Objectives, page i
• Audience, page i
• Documentation Conventions, page ii
• Documentation Organization, page iii
• Additional Resources and Documentation Feedback, page xi
Documentation Objectives
Cisco IOS documentation describes the tasks and commands available to configure and maintain Cisco
networking devices.
Audience
The Cisco IOS documentation set is intended for users who configure and maintain Cisco networking
devices (such as routers and switches) but who may not be familiar with the configuration and
maintenance tasks, the relationship among tasks, or the Cisco IOS commands necessary to perform
particular tasks. The Cisco IOS documentation set is also intended for those users experienced with
Cisco IOS who need to know about new features, new configuration options, and new software
characteristics in the current Cisco IOS release.
About Cisco IOS and Cisco IOS XE Software Documentation
Documentation Conventions
ii
Documentation Conventions
In Cisco IOS documentation, the term router may be used to refer to various Cisco products; for example,
routers, access servers, and switches. These and other networking devices that support Cisco
IOS
software are shown interchangeably in examples and are used only for illustrative purposes. An example
that shows one product does not necessarily mean that other products are not supported.
This section includes the following topics:
• Typographic Conventions, page ii
• Command Syntax Conventions, page ii
• Software Conventions, page iii
• Reader Alert Conventions, page iii
Typographic Conventions
Cisco IOS documentation uses the following typographic conventions:
Command Syntax Conventions
Cisco IOS documentation uses the following command syntax conventions:
Convention Description
^ or Ctrl Both the ^ symbol and Ctrl represent the Control (Ctrl) key on a keyboard. For
example, the key combination ^D or Ctrl-D means that you hold down the
Control key while you press the D key. (Keys are indicated in capital letters but
are not case
sensitive.)
string A string is a nonquoted set of characters shown in italics. For example, when
setting a Simple Network Management Protocol (SNMP) community string to
public, do not use quotation marks around the string; otherwise, the string will
include the quotation marks.
Convention Description
bold Bold text indicates commands and keywords that you enter as shown.
italic Italic text indicates arguments for which you supply values.
[x] Square brackets enclose an optional keyword or argument.
... An ellipsis (three consecutive nonbolded periods without spaces) after a syntax
element indicates that the element can be repeated.
| A vertical line, called a pipe, indicates a choice within a set of keywords
or
arguments.
[x | y] Square brackets enclosing keywords or arguments separated by a pipe indicate an
optional choice.
{x | y} Braces enclosing keywords or arguments separated by a pipe indicate a
required
choice.
[x {y | z}] Braces and a pipe within square brackets indicate a required choice within an
optional element.
About Cisco IOS and Cisco IOS XE Software Documentation
Documentation Organization
iii
Software Conventions
Cisco IOS uses the following program code conventions:
Reader Alert Conventions
The Cisco IOS documentation set uses the following conventions for reader alerts:
Caution Means reader be careful. In this situation, you might do something that could result in equipment
damage or loss of data.
Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Timesaver Means the described action saves time. You can save time by performing the action described in the
paragraph.
Documentation Organization
This section describes the Cisco IOS documentation set, how it is organized, and how to access it on
Cisco.com. Included are lists of configuration guides, command references, and supplementary
references and resources that make up the documentation set. The following topics are included:
• Cisco IOS Documentation Set, page iv
• Cisco IOS Documentation on Cisco.com, page iv
• Configuration Guides, Command References, and Supplementary Resources, page v
Convention Description
Courier font
Courier font is used for information that is displayed on a PC or terminal screen.
Bold Courier font
Bold Courier font indicates text that the user must enter.
< > Angle brackets enclose text that is not displayed, such as a password. Angle
brackets also are used in contexts in which the italic font style is not supported;
for example, ASCII text.
! An exclamation point at the beginning of a line indicates that the text that follows
is a comment, not a line of code. An exclamation point is also displayed by
Cisco
IOS software for certain processes.
[ ] Square brackets enclose default responses to system prompts.
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