book

Network Security Fundamentals

Name: Network Security Fundamentals
ISBN: 1587051672

by Gert De Laet, Gert Schauwers

September 2004

Beginner

480 pages

9h 37m

English

Cisco Press

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Copyright
Dedications
About the Authors
About the Technical Reviewers
Acknowledgments
Icons Used in This Book
Command Syntax Conventions
Foreword
IntroductionGoals of This BookWho Should Read This Book?Organization of This BookPart I: IntroductionPart II: Building BlocksPart III: Tools and TechniquesPart IV: Appendixes
I. Introduction
1. Network Security Overview
Defining TrustMost TrustedLess TrustedLeast TrustedWeaknesses and VulnerabilitiesResponsibilities for Network SecuritySecurity ObjectivesConclusionQ&A
2. Understanding Vulnerabilities—The Need for Security
Risk and VulnerabilityTCP/IP Suite WeaknessesIPTCPTCP/IP Security IssuesIP Address SpoofingCovert ChannelsIP Fragment AttacksTCP FlagsSYN FloodClosing a Connection by FINConnection HijackingCountermeasuresBuffer OverflowsBuffer Overflow MechanismsBuffer Overflow ProtectionCountermeasuresSpoofing TechniquesAddress Resolution Protocol SpoofingDomain Name Service SpoofingCountermeasuresSocial EngineeringTechniquesCountermeasuresConclusionQ&A
3. Understanding Defenses
Digital IDsIntrusion Detection SystemPC Card–Based SolutionsSecurity CardsHardware KeysPC Encryption CardsPhysical SecurityOutside and External SecurityInternal SecurityDisaster-Recovery PlansPersonnel AwarenessEncrypted LoginSecure Shell ProtocolKerberos Encrypted Login SessionsSecure Socket Layer (HTTP versus HTTPS)FirewallsReusable PasswordsWeaknessesSample Password PolicyAntivirus SoftwareEncrypted FilesBiometricsFingerprint ScanningVoice RecognitionTyping BiometricsFace RecognitionSignature RecognitionConclusionQ&A

II. Building Blocks
4. Cryptography
Cryptography versus CryptanalysisManual SystemsCrypto MachinesComputersModern-Day TechniquesSymmetric Key AlgorithmsData Encryption StandardTriple Data Encryption StandardAESAsymmetric Key AlgorithmsDiffie-HellmanRivest, Shamir, AdelmanPretty Good PrivacyHashing AlgorithmsMessage Digest 5SHA-1Secure Socket Layer and Transport Layer SecurityDigital CertificatesCharacteristics of Digital CertificatesEnrolling in a CAConclusionQ&A
5. Security Policies
Defining a Security Policy?Importance of a Security PolicyDevelopment ProcessIncident Handling ProcessSecurity WheelSample Security PolicyPurposeScopePolicyEnforcementDefinitionsConclusionQ&A
6. Secure Design
Network Design—PrinciplesTop-Down Design PracticesRequirements and ConstraintsTechnological ConstraintsSocial ConstraintsPolitical ConstraintsEconomic ConstraintsDesign Activities, Tools, and TechniquesAuditing and Analyzing an Existing NetworkSimulating Network TrafficDefense in DepthNetwork Design—MethodologyStages of the NetworkPlanning PhaseDesign PhaseImplementation PhaseOperation PhaseOptimization PhaseReturn on InvestmentPhysical Security IssuesSecuring the PerimeterInternal SecurityPersonnel TrainingSurvivability and RecoverySwitches and HubsConclusionQ&A
III. Tools and Techniques
7. Web Security
HardeningFile SystemsWeb ServersLoggingRestricting AccessBrowsersSecurity ZonesCookiesCase StudyConclusionQ&A
8. Router Security
Basic Router SecurityAdministrative AccessServicesRouter Security to Protect the NetworkAccess ListsEnhanced Access ListsDynamic Access ListsTime-Based Access ListsReflexive Access ListsCBACCase StudyConclusionQ&AReferences in This Chapter
9. Firewalls
Firewall BasicsDifferent Types of FirewallsHardware Firewalls: PIX and NetScreenPIXASAData Flow for the PIXNetScreen FirewallCheck Point Software FirewallsEnhancements for FirewallsNATProxy ServicesContent FiltersAntivirus SoftwareCase Study: Placing Filtering Routers and FirewallsSummaryQ&A
10. Intrusion Detection System Concepts
Introduction to Intrusion DetectionIDS FundamentalsNotification AlarmsSignature-Based IDSPolicy-Based IDSAnomaly-Based IDSNetwork IDS versus Host IDSEvasion and Antievasion TechniquesOrganizational Issues and ComplicationsTechnological ConstraintsSocial ConstraintsPolitical ConstraintsHost-Based IDSsHost Sensor Components and ArchitectureCisco Secure AgentCisco Secure Agent ManagerDeploying Host-Based Intrusion Detection in the NetworkNetwork-Based IDSsNetwork Sensor Components and ArchitectureDeploying Network-Based Intrusion Detection in the NetworkRouter IDS Features and Network ModulesPIX IDSResponse to Events and AlertsIP Session LoggingActive Response—TCP ResetsActive Response—Shunning or BlockingNotification and ReportingIDS Management Communications—Monitoring the NetworkCommunication Syntax—RDEPOut-of-Band ManagementIn-Band ManagementSensor MaintenanceCase Study: Deployment of IDS Sensors in the Organization and Their Typical PlacementIDS Placement on the Network BlueprintIDS Sensor Initialization and ConfigurationIDS TuningNetwork Under Attack—IDS Event ViewerIDS Active Responses in Action—Blocking a HostConclusionQ&A
11. Remote Access
AAA ModelAuthenticationAuthorizationAccountingAAA ServersTACACS+ OverviewRADIUS OverviewTACACS+ versus RADIUSKerberosLock-and-Key FeatureTwo-Factor IdentificationCase Study: Configuring Secure Remote AccessTACACS+ Configuration Task ListRouter COMMSROOM1 Setup and Configuration for This ScenarioTest and Troubleshoot Configuration for This ScenarioSummaryQ&A
12. Virtual Private Networks
Generic Routing Encapsulation TunnelsIP SecurityEncryptionData IntegrityOrigin AuthenticationPreshared KeysRSA SignaturesRSA-Encrypted NoncesAntireplay ProtectionProtocol FrameworkAHESPTunnel or Transport ModeTransport ModeTunnel ModeTransform SetsVPNs with IPSecCase Study: Remote Access VPNConclusionQ&A
13. Public Key Infrastructure
Public Key DistributionTrusted Third PartyPKI TopologyEnrollment ProcedureRevocation ProcedureCase Study: Creating Your Own CAConclusionQ&A
14. Wireless Security
Different WLAN ConfigurationsWhat Is a WLAN?How Wireless WorksWLAN ArchitectureSetting Up the WLAN ConnectionRisks of Open Wireless PortsSSID VulnerabilitiesOpen Authentication VulnerabilitiesShared Key Authentication VulnerabilitiesWEP Protocol OverviewWEP Protocol VulnerabilitiesCountermeasures to WEP Protocol VulnerabilitiesEAP Protocol and the 802.11i StandardWar-Driving and War-ChalkingSAFE WLAN Design Techniques and ConsiderationsCase Study: Adding Wireless Solutions to a Secure NetworkConclusionQ&A
15. Logging and Auditing
LoggingSYSLOGSimple Network Management ProtocolSNMP NotificationsSNMP VersionsSNMP ConfigurationCreate or Modify Access Control for an SNMP CommunityCreate or Modify an SNMP View RecordSpecify an SNMP Server Engine NameSpecify SNMP Server Group NamesConfigure SNMP Server HostsConfigure SNMP Server UsersMonitor and Troubleshoot SNMP StatusConfigure SNMP NotificationsRemote MonitoringService Assurance AgentCase StudyConclusionQ&A
IV. Appendixes
A. SAFE Blueprint
Introduction to the SAFE BlueprintSAFE Blueprint: Overview of the ArchitectureSummaryReferences in This Appendix
B. SANS Policies
SANS OverviewSANS Initiatives and ProgramsSecurity Policy ProjectIs It a Policy, a Standard, or a Guideline?Sample PoliciesReferences in This Appendix
C. NSA Guidelines
Security GuidesReferences in This Appendix
D. Answers to Chapter Q&A
Chapter 1 Q&AChapter 2 Q&AChapter 3 Q&AChapter 4 Q&AChapter 5 Q&AChapter 6 Q&AChapter 7 Q&AChapter 8 Q&AChapter 9 Q&AChapter 10 Q&AChapter 11 Q&AChapter 12 Q&AChapter 13 Q&AChapter 14 Q&AChapter 15 Q&A
Bibliography
BooksWebsite References

Content preview from Network Security Fundamentals

Chapter 9. Firewalls

On completing this chapter, you will be able to

Explain the basics of firewalls
Describe the different types of firewalls
Describe some firewall enhancements
Explain firewall placement in a network

This chapter covers a variety of types of firewalls, including devices such as PIX, software solutions such as Check Point, and personal firewalls. The chapter defines firewalls and explores their purpose and use in today's large-scale IP-based networks, where attacks can occur from within and from external sources.

Protecting the confidentiality of information, preventing unauthorized access, and defending against external and internal attacks remain primary concerns of all network managers today. IT departments must defend against these ...

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Network Security Fundamentals

by Gert De Laet, Gert Schauwers

Chapter 9. Firewalls

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