Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 236.1 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureGoalsDesign an IP addressing schemeDesign the internal routing modelDesign the Internet connectivity model6.2 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureIP addressing schemeOne of most important aspects of network designInfluenced by several factorsUse of public or private IP addressesNumber of physical locationsNumber of hosts per physical locationTotal number of hosts in all locationsEstimated broadcast traffic at each physical locationIP summarizationDesigning an IP Addressing Scheme(Skill 1)6.3 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructurePublic IP addressingRequires lease of a block of valid public IP addresses capable of supporting all hosts on internal networkAdvantagesDirect access to Internet for all internal hostsReduced complexityDisadvantagesCostPossible reduction of securityDesigning an IP Addressing Scheme (2)(Skill 1)6.4 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructurePrivate IP addressingCan use any valid private IP address blockAdvantagesDoes not need a block of public IP addressesDirect Internet access is not available to client (increases security and makes firewall configuration easier)DisadvantageMust use Network Address Translation (NAT) device to connect clients to InternetDesigning an IP Addressing Scheme (3)(Skill 1)6.5 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureNumber of physical locations provides a base from which to figure the number of subnets requiredNumber of hosts per physical location and total number of hosts in entire networkNumber of hosts not equivalent to number of usersHosts also include workstations, servers, router ports, managed network devices, SMNP-enabled devices, and network printersTotal number of hosts helps you determine the number of private network addresses requiredNumber of hosts per physical location helps determine how many subnets are needed in that physical locationDesigning an IP Addressing Scheme (4)(Skill 1)6.6 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureFigure 6-1 Calculating a base number of required subnets(Skill 1)6.7 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureFigure 6-2 Summarization example(Skill 1)6.8 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureDesigning internal routing modelMajor component of network designMajor stepsDesigning the topologySpecifying the routing protocol configurationDesigning the Internal Routing Model(Skill 2)6.9 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureDesigning the topologyPrimarily concerned with meeting certain goals of the organizationReliabilityRedundancyPerformanceDesigning the Internal Routing Model (2)(Skill 2)6.10 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureSpecifying the routing protocol configurationEach routing protocol has its own idiosyncrasiesSupported protocolsRouting Information Protocol (RIP) Open Shortest Path First (OSPF) protocolDesigning the Internal Routing Model (3)(Skill 2)6.11 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureRouting Information Protocol (RIP)Simple, easy to enable and configure, but not very secure or efficientImproving efficiency Modifying default timersEnabling Silent RIP on all interfaces that do not contain other RIP routers (keeps RIP from advertising to systems on that subnet)Defining neighbors (disables RIP broadcasting, sends updates by unicast which is more efficient, and improves security)Designing the Internal Routing Model (4)(Skill 2)6.12 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureOpen Shortest Path First (OSPF) protocolMore efficientRouting design is more important and complex than with RIPPrimary component: area designations, used to reduce processor and memory use on routerKeep OSPF areas limited to under 100 routers, or significantly less if area is very active (links unstable, SPF computations common, many paths in network)Designing the Internal Routing Model (5)(Skill 2)6.13 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureFigure 6-4 A large network in a single OSPF area(Skill 2)6.14 © 2004 Pearson Education, Inc.Exam 70-297 Designing a Microsoft® Windows® Server 2003 Active Directory and Network InfrastructureLesson 6: Designing the Network InfrastructureDesigning an Internet connectivity modelPrimary concernsAccess method SecurityAccess methodsDirect connectivity