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CCNA Security Official Exam Certification Guide (Exam 640-553)

Book

  • Sorry, this book is no longer in print.
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  • Description
  • Sample Content
  • Updates
  • Copyright 2008
  • Edition: 1st
  • Book
  • ISBN-10: 1-58705-792-1
  • ISBN-13: 978-1-58705-792-2

This is the eBook version of the printed book.Note that this eBook does not contain the practice test software that accompanies the print book.

CCNA Security Official Exam Certification Guide is a best of breed Cisco® exam study guide that focuses specifically on the objectives for the CCNA® Security IINS exam. Senior security instructors Michael Watkins and Kevin Wallace share preparation hints and test-taking tips, helping you identify areas of weakness and improve both your conceptual knowledge and hands-on skills. Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics.

  • Master the IINS 640-553 exam with this official study guide
  • Assess your knowledge with chapter-opening quizzes
  • Review key concepts with Exam Preparation Tasks

CCNA Security Official Exam Certification Guide presents you with an organized test preparation routine through the use of proven series elements and techniques. “Do I Know This Already?” quizzes open each chapter and allow you to decide how much time you need to spend on each section. Exam topic lists make referencing easy. Chapter-ending Exam Preparation Tasks sections help drill you on key concepts you must know thoroughly.

Well-regarded for its level of detail, assessment features, and challenging review questions and exercises, this official study guide helps you master the concepts and techniques that will enable you to succeed on the exam the first time.

CCNA Security Official Exam Certification Guide is part of a recommended learning path from Cisco that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press. To find out more about instructor-led training, e-learning, and hands-on instruction offered by authorized Cisco Learning Partners worldwide, please visit www.cisco.com/go/authorizedtraining.

Michael Watkins, CCNA/CCNP®/CCVP®/CCSP®, is a full-time senior technical instructor with SkillSoft Corporation. With 13 years of network management, training, and consulting experience, Michael has worked with organizations such as Kraft Foods, Johnson and Johnson, Raytheon, and the United States Air Force to help them implement and learn the latest network technologies.

Kevin Wallace, CCIE® No. 7945, is a certified Cisco instructor working full time for SkillSoft, where he teaches courses in the Cisco CCSP, CCVP, and CCNP tracks. With 19 years of Cisco networking experience, Kevin has been a network design specialist for the Walt Disney World Resort and a network manager for Eastern Kentucky University. Kevin also is a CCVP, CCSP, CCNP, and CCDP with multiple Cisco security and IP communications specializations.

The official study guide helps you master all the topics on the IINS exam, including

  • Network security threats
  • Security policies
  • Network perimeter defense
  • AAA configuration
  • Router security
  • Switch security
  • Endpoint security
  • SAN security
  • VoIP security
  • IOS firewalls
  • Cisco IOS® IPS
  • Cryptography
  • Digital signatures
  • PKI and asymmetric encryption
  • IPsec VPNs

This volume is part of the Exam Certification Guide Series from Cisco Press®. Books in this series provide officially developed exam preparation materials that offer assessment, review, and practice to help Cisco Career Certification candidates identify weaknesses, concentrate their study efforts, and enhance their confidence as exam day nears.

Table of Contents

Foreword

Introduction

Part I Network Security Concepts

Chapter 1 Understanding Network Security Principles

“Do I Know This Already?” Quiz

Foundation Topics

Exploring Security Fundamentals

    Why Network Security Is a Necessity

        Types of Threats

        Scope of the Challenge

        Nonsecured Custom Applications

    The Three Primary Goals of Network Security

        Confidentiality

        Integrity

        Availability

    Categorizing Data

        Classification Models

        Classification Roles

    Controls in a Security Solution

    Responding to a Security Incident

    Legal and Ethical Ramifications

        Legal Issues to Consider

Understanding the Methods of Network Attacks

    Vulnerabilities

    Potential Attackers

    The Mind-set of a Hacker

    Defense in Depth

    Understanding IP Spoofing

        Launching a Remote IP Spoofing Attack with IP Source Routing

        Launching a Local IP Spoofing Attack Using a Man-in-the-Middle Attack

        Protecting Against an IP Spoofing Attack

    Understanding Confidentiality Attacks

    Understanding Integrity Attacks

    Understanding Availability Attacks

    Best-Practice Recommendations

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 2 Developing a Secure Network

“Do I Know This Already?” Quiz

Foundation Topics

Increasing Operations Security

    System Development Life Cycle 49

        Initiation 49

        Acquisition and Development 49

        Implementation 50

        Operations and Maintenance 50

        Disposition 51

    Operations Security Overview 51

    Evaluating Network Security 52

        Nmap 54

    Disaster Recovery Considerations 55

        Types of Disruptions 56

        Types of Backup Sites 56

Constructing a Comprehensive Network Security Policy 57

    Security Policy Fundamentals 57

    Security Policy Components 58

        Governing Policy 58

        Technical Policies 58

        End-User Policies 59

        More-Detailed Documents 59

    Security Policy Responsibilities 59

    Risk Analysis, Management, and Avoidance 60

        Quantitative Analysis 60

        Qualitative Analysis 61

        Risk Analysis Benefits 61

        Risk Analysis Example: Threat Identification 61

        Managing and Avoiding Risk 62

    Factors Contributing to a Secure Network Design 62

        Design Assumptions 63

        Minimizing Privileges 63

        Simplicity Versus Complexity 64

    User Awareness and Training 64

Creating a Cisco Self-Defending Network 66

    Evolving Security Threats 66

    Constructing a Cisco Self-Defending Network 67

        Cisco Security Management Suite 69

    Cisco Integrated Security Products 70

Exam Preparation Tasks 74

Review All the Key Topics 74

Complete the Tables and Lists from Memory 75

Definition of Key Terms 75

Chapter 3 Defending the Perimeter 77

“Do I Know This Already?” Quiz 77

Foundation Topics 81

ISR Overview and Providing Secure Administrative Access 81

    IOS Security Features 81

    Cisco Integrated Services Routers 81

        Cisco 800 Series 82

        Cisco 1800 Series 83

        Cisco 2800 Series 84

        Cisco 3800 Series 84

        ISR Enhanced Features 85

    Password-Protecting a Router 86

    Limiting the Number of Failed Login Attempts 92

    Setting a Login Inactivity Timer 92

    Configuring Privilege Levels 93

    Creating Command-Line Interface Views 93

    Protecting Router Files 95

    Enabling Cisco IOS Login Enhancements for Virtual Connections 96

    Creating a Banner Message 98

Cisco Security Device Manager Overview 99

    Introducing SDM 99

    Preparing to Launch Cisco SDM

    Exploring the Cisco SDM Interface

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Command Reference to Check Your Memory

Chapter 4 Configuring AAA

“Do I Know This Already?” Quiz

Foundation Topics

Configuring AAA Using the Local User Database

    Authentication, Authorization, and Accounting

    AAA for Cisco Routers

    Router Access Authentication

    Using AAA to Configure Local User Database Authentication

        Defining a Method List

        Setting AAA Authentication for Login

        Configuring AAA Authentication on Serial Interfaces Running PPP

        Using the aaa authentication enable default Command

        Implementing the aaa authorization Command

        Working with the aaa accounting Command

    Using the CLI to Troubleshoot AAA for Cisco Routers

    Using Cisco SDM to Configure AAA

Configuring AAA Using Cisco Secure ACS

    Overview of Cisco Secure ACS for Windows

        Additional Features of Cisco Secure ACS 4.0 for Windows

    Cisco Secure ACS 4.0 for Windows Installation

    Overview of TACACS+ and RADIUS

        TACACS+ Authentication

        Command Authorization with TACACS+

        TACACS+ Attributes

        Authentication and Authorization with RADIUS

        RADIUS Message Types

        RADIUS Attributes

        Features of RADIUS

    Configuring TACACS+

        Using the CLI to Configure AAA Login Authentication on Cisco Routers

        Configuring Cisco Routers to Use TACACS+ Using the Cisco SDM

        Defining the AAA Servers

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Command Reference to Check Your Memory

Chapter 5 Securing the Router

“Do I Know This Already?” Quiz

Foundation Topics

Locking Down the Router

    Identifying Potentially Vulnerable Router Interfaces and Services

    Locking Down a Cisco IOS Router

        AutoSecure

        Cisco SDM One-Step Lockdown

Using Secure Management and Reporting

    Planning for Secure Management and Reporting

    Secure Management and Reporting Architecture

    Configuring Syslog Support

    Securing Management Traffic with SNMPv3

    Enabling Secure Shell on a Router

    Using Cisco SDM to Configure Management Features

        Configuring Syslog Logging with Cisco SDM

        Configuring SNMP with Cisco SDM

        Configuring NTP with Cisco SDM

        Configuring SSH with Cisco SDM

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Command Reference to Check Your Memory

Part II Constructing a Secure Infrastructure

Chapter 6 Securing Layer 2 Devices

“Do I Know This Already?” Quiz

Foundation Topics

Defending Against Layer 2 Attacks

    Review of Layer 2 Switch Operation

    Basic Approaches to Protecting Layer 2 Switches

    Preventing VLAN Hopping

        Switch Spoofing

        Double Tagging

    Protecting Against an STP Attack

    Combating DHCP Server Spoofing

    Using Dynamic ARP Inspection

    Mitigating CAM Table Overflow Attacks

    Spoofing MAC Addresses

    Additional Cisco Catalyst Switch Security Features

        Using the SPAN Feature with IDS

        Enforcing Security Policies with VACLs

        Isolating Traffic Within a VLAN Using Private VLANs

        Traffic Policing

        Notifying Network Managers of CAM Table Updates

    Port Security Configuration

    Configuration Recommendations

Cisco Identity-Based Networking Services

    Introduction to Cisco IBNS

    Overview of IEEE 802.1x

    Extensible Authentication Protocols

        EAP-MD5

        EAP-TLS

        PEAP (MS-CHAPv2)

        EAP-FAST

    Combining IEEE 802.1x with Port Security Features

    Using IEEE 802.1x for VLAN Assignment

    Configuring and Monitoring IEEE 802.1x

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Command Reference to Check Your Memory

Chapter 7 Implementing Endpoint Security

“Do I Know This Already?” Quiz

Foundation Topics

Examining Endpoint Security

    Defining Endpoint Security

        Examining Operating System Vulnerabilities

        Examining Application Vulnerabilities

    Understanding the Threat of Buffer Overflows

        Buffer Overflow Defined

        The Anatomy of a Buffer Overflow Exploit

        Understanding the Types of Buffer Overflows

        Additional Forms of Attack

Securing Endpoints with Cisco Technologies

    Understanding IronPort

        The Architecture Behind IronPort

    Examining the Cisco NAC Appliance

    Working with the Cisco Security Agent

        Understanding Cisco Security Agent Interceptors

        Examining Attack Response with the Cisco Security Agent

    Best Practices for Securing Endpoints

        Application Guidelines

        Apply Application Protection Methods

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 8 Providing SAN Security

“Do I Know This Already?” Quiz

Foundation Topics

Overview of SAN Operations

    Fundamentals of SANs

    Organizational Benefits of SAN Usage

    Understanding SAN Basics

    Fundamentals of SAN Security

        Classes of SAN Attacks

Implementing SAN Security Techniques

    Using LUN Masking to Defend Against Attacks

    Examining SAN Zoning Strategies

        Examining Soft and Hard Zoning

    Understanding World Wide Names

    Defining Virtual SANs

        Combining VSANs and Zones

    Identifying Port Authentication Protocols

        Understanding DHCHAP

        CHAP in Securing SAN Devices

    Working with Fibre Channel Authentication Protocol

    Understanding Fibre Channel Password Authentication Protocol

    Assuring Data Confidentiality in SANs

        Incorporating Encapsulating Security Payload (ESP)

        Providing Security with Fibre Channel Security Protocol

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 9 Exploring Secure Voice Solutions

“Do I Know This Already?” Quiz

Foundation Topics

Defining Voice Fundamentals

    Defining VoIP

    The Need for VoIP

    VoIP Network Components

    VoIP Protocols

Identifying Common Voice Vulnerabilities

    Attacks Targeting Endpoints

    VoIP Spam

    Vishing and Toll Fraud

    SIP Attack Targets

Securing a VoIP Network

    Protecting a VoIP Network with Auxiliary VLANs

    Protecting a VoIP Network with Security Appliances

    Hardening Voice Endpoints and Application Servers

    Summary of Voice Attack Mitigation Techniques

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 10 Using Cisco IOS Firewalls to Defend the Network

“Do I Know This Already?” Quiz

Foundation Topics

Exploring Firewall Technology

    The Role of Firewalls in Defending Networks

    The Advance of Firewall Technology

    Transparent Firewalls

    Application Layer Firewalls

        Benefits of Using Application Layer Firewalls

        Working with Application Layer Firewalls

        Application Firewall Limitations

    Static Packet-Filtering Firewalls

    Stateful Packet-Filtering Firewalls

        Stateful Packet Filtering and the State Table

        Disadvantages of Stateful Filtering

        Uses of Stateful Packet-Filtering Firewalls

    Application Inspection Firewalls

        Application Inspection Firewall Operation

        Effective Use of an Application Inspection Firewall

    Overview of the Cisco ASA Adaptive Security Appliance

    The Role of Firewalls in a Layered Defense Strategy

    Creating an Effective Firewall Policy

Using ACLs to Construct Static Packet Filters

    The Basics of ACLs

    Cisco ACL Configuration

        Working with Turbo ACLs

        Developing ACLs

    Using the CLI to Apply ACLs to the Router Interface

    Considerations When Creating ACLs

    Filtering Traffic with ACLs

    Preventing IP Spoofing with ACLs

    Restricting ICMP Traffic with ACLs

    Configuring ACLs to Filter Router Service Traffic

        vty Filtering

        SNMP Service Filtering

        RIPv2 Route Filtering

    Grouping ACL Functions

Implementing a Cisco IOS Zone-Based Firewall

    Understanding Cisco IOS Firewalls

        Traffic Filtering

        Traffic Inspection

        The Role of Alerts and Audit Trails

        Classic Firewall Process

        SPI and CBAC

    Examining the Principles Behind Zone-Based Firewalls

        Changes to Firewall Configuration

        Zone Membership Rules

        Understanding Security Zones

        Zones and Inspection

        Security Zone Restrictions

        Working with Zone Pairs

        Security Zone Firewall Policies

        Class Maps

    Verifying Zone-Based Firewall Configuration

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Command Reference to Check Your Memory

Chapter 11 Using Cisco IOS IPS to Secure the Network

“Do I Know This Already?” Quiz

Foundation Topics

Examining IPS Technologies

    IDS Versus IPS

    IDS and IPS Device Categories

        Detection Methods

        Network-Based Versus Host-Based IPS

        Deploying Network-Based and Host-Based Solutions

    IDS and IPS Appliances

        Cisco IDS 4215 Sensor

        Cisco IPS 4240 Sensor

        Cisco IPS 4255 Sensor

        Cisco IPS 4260 Sensor

    Signatures

        Exploit Signatures

        Connection Signatures

        String Signatures

        Denial-of-Service Signatures

    Signature Definition Files

    Alarms

Using SDM to Configure Cisco IOS IPS

    Launching the Intrusion Prevention Wizard

    IPS Policies Wizard

    Creating IPS Rules

    Manipulating Global IPS Settings

    Signature Configuration

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Part III Extending Security and Availability with Cryptography and VPNs

Chapter 12 Designing a Cryptographic Solution

“Do I Know This Already?” Quiz

Foundation Topics

Introducing Cryptographic Services

    Understanding Cryptology

        Cryptography Through the Ages

        The Substitution Cipher

        The Vigenère Cipher

        Transposition Ciphers

        Working with the One-Time Pad

        The Encryption Process

        Cryptanalysis

        Understanding the Features of Encryption Algorithms

    Symmetric and Asymmetric Encryption Algorithms

        Encryption Algorithms and Keys

        Symmetric Encryption Algorithms

        Asymmetric Encryption Algorithms

    The Difference Between Block and Stream Ciphers

        Block Ciphers

        Stream Ciphers

Exploring Symmetric Encryption

    Functionality of Symmetric Encryption Algorithms

        Key Lengths

    Features and Functions of DES

        Working with the DES Key

        Modes of Operation for DES

        Working with DES Stream Cipher Modes

        Usage Guidelines for Working with DES

        Understanding How 3DES Works

        Encrypting with 3DES

    AES

        The Rijndael Cipher

        Comparing AES and 3DES

        Availability of AES in the Cisco Product Line

    SEAL

        SEAL Restrictions

    The Rivest Ciphers

Understanding Security Algorithms

    Selecting an Encryption Algorithm

    Understanding Cryptographic Hashes

    Working with Hashing

    Designing Key Management

        Components of Key Management

        Understanding Keyspaces

        Issues Related to Key Length

    SSL VPNs

    Establishing an SSL Tunnel

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 13 Implementing Digital Signatures

“Do I Know This Already?” Quiz

Foundation Topics

Examining Hash Algorithms

    Exploring Hash Algorithms and HMACs

        Anatomy of a Hash Function

        Application of Hash Functions

        Cryptographic Hash Functions

        Application of Cryptographic Hashes

        HMAC Explained

    MD5 Features and Functionality

        Origins of MD5

        Vulnerabilities of MD5

        Usage of MD5

    SHA-1 Features and Functionality

        Overview of SHA-1

        Vulnerabilities of SHA-1

        Usage of SHA-1

Using Digital Signatures

    Understanding Digital Signatures

        Digital Signature Scheme

        Authentication and Integrity

    Examining RSA Signatures

        Exploring the History of RSA

        Understanding How RSA Works

        Encrypting and Decrypting Messages with RSA

        Signing Messages with RSA

        Vulnerabilities of RSA

    Exploring the Digital Signature Standard

        Using the DSA Algorithm

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 14 Exploring PKI and Asymmetric Encryption

“Do I Know This Already?” Quiz

Foundation Topics

Understanding Asymmetric Algorithms

    Exploring Asymmetric Encryption Algorithms

        Using Public-Key Encryption to Achieve Confidentiality

        Providing Authentication with a Public Key

    Understanding the Features of the RSA Algorithm

        Working with RSA Digital Signatures

        Guidelines for Working with RSA

    Examining the Features of the Diffie-Hellman Key Exchange Algorithm

        Steps of the Diffie-Hellman Key Exchange Algorithm

Working with a PKI

    Examining the Principles Behind a PKI

        Understanding PKI Terminology

        Components of a PKI

        Classes of Certificates

        Examining the PKI Topology of a Single Root CA

        Examining the PKI Topology of Hierarchical CAs

        Examining the PKI Topology of Cross-Certified CAs

        Understanding PKI Usage and Keys

        Working with PKI Server Offload

    Understanding PKI Standards

        Understanding X.509v3

        Understanding Public Key Cryptography Standards (PKCS)

        Understanding Simple Certificate Enrollment Protocol (SCEP)

    Exploring the Role of Certificate Authorities and Registration Authorities in a PKI

        Examining Identity Management

        Retrieving the CA Certificate

        Understanding the Certificate Enrollment Process

        Examining Authentication Using Certificates

        Examining Features of Digital Certificates and CAs

        Understanding the Caveats of Using a PKI

        Understanding How Certificates Are Employed

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Chapter 15 Building a Site-to-Site IPsec VPN Solution

“Do I Know This Already?” Quiz

Foundation Topics

Exploring the Basics of IPsec

    Introducing Site-to-Site VPNs

    Overview of IPsec

    IKE Modes and Phases

    Authentication Header and Encapsulating Security Payload

    Cisco VPN Product Offerings

        Cisco VPN-Enabled Routers and Switches

        Cisco VPN 3000 Series Concentrators

        Cisco ASA 5500 Series Appliances

        Cisco 500 Series PIX Security Appliances

        Hardware Acceleration Modules

    VPN Design Considerations and Recommendations

        Best-Practice Recommendations for Identity and IPsec Access Control

        Best-Practice Recommendations for IPsec

        Best-Practice Recommendations for Network Address Translation

        Best-Practice Recommendations for Selecting a Single-Purpose Versus

        Multipurpose Device

Constructing an IPsec Site-to-Site VPN

    The Five Steps in the Life of an IPsec Site-to-Site VPN

    The Five Steps of Configuring an IPsec Site-to-Site VPN

    Configuring an IKE Phase 1 Tunnel

    Configuring an IKE Phase 2 Tunnel

    Applying Crypto Maps

Using Cisco SDM to Configure IPsec on a Site-to-Site VPN

    Introduction to the Cisco SDM VPN Wizard

    Quick Setup

    Step-by-Step Setup

        Configuring Connection Settings

        Selecting an IKE Proposal

        Selecting a Transform Set

        Selecting Traffic to Protect in the IPsec Tunnel

        Applying the Generated Configuration

        Monitoring the Configuration

Exam Preparation Tasks

Review All the Key Topics

Complete the Tables and Lists from Memory

Definition of Key Terms

Command Reference to Check Your Memory

Part IV Final Preparation

Chapter 16 Final Preparation

Exam Engine and Questions on the CD

    Install the Software from the CD

    Activate and Download the Practice Exam

    Activating Other Exams

Study Plan

    Recall the Facts

    Use the Exam Engine

        Choosing Study or Simulation Mode

        Passing Scores for the IINS Exam

Part V Appendixes

Appendix A Answers to “Do I Know This Already?” Questions

Appendix B Glossary

Appendix C CCNA Security Exam Updates: Version 1.0

Appendix D Memory Tables (CD only)

Appendix E Memory Tables Answer Key (CD only)

1587202204     TOC    5/19/2008

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We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020