Top-Down Network Design - Unisinos

1 Top-Down Network DesignChapter ThreeCharacterizing the Existing InternetworkCopyright 2004 Cisco Press &Priscilla OppenheimerPDF Creator - PDF4 Free s the Starting Point? According to AbrahamLincoln: If we could first know where we are andwhither we are tending, we could better judgewhat to do and how to do it. PDF Creator - PDF4 Free Are We? Characterize the exiting internetwork interms of: Its infrastructure Logical structure (modularity, hierarchy, topology) Physical structure Addressing and naming Wiring and media Architectural and environmental constraints HealthPDF Creator - PDF4 Free a Network MapGigabitEthernetEugeneEthernet20 usersWeb/FTP serverGrants PassHQ16 MbpsToken RingFEP(Front EndProcessor)

2 IBMM ainframeT1 MedfordFast Ethernet50 usersRoseburgFast Ethernet30 usersFrame RelayCIR = 56 KbpsDLCI = 5 Frame RelayCIR = 56 KbpsDLCI = 4 Grants PassHQFast Ethernet75 usersInternetT1 PDF Creator - PDF4 Free Addressing andNaming IP addressing for major devices, clientnetworks, server networks, and so on Any addressing oddities, such asdiscontiguous subnets? Any strategies for addressing and naming? For example, sites may be named using airportcodes San Francisco = SFO, Oakland = OAKPDF Creator - PDF4 Free SubnetsArea 1 Subnets 2 Subnets ARouter BPDF Creator - PDF4 Free the Wiring and Media Single-mode fiber Multi-mode fiber Shielded twisted pair (STP) copper Unshielded-twisted-pair (UTP) copper Coaxial cable Microwave Laser Radio Infra-redPDF Creator - PDF4 Free ClosetHorizontalWiringWork-AreaWiringWal lplateMain Cross-Connect Room(or Main Distribution Frame)Intermediate Cross-Connect Room(or Intermediate Distribution Frame)

3 Building A - HeadquartersBuilding BVerticalWiring(BuildingBackbone)CampusB ackboneCampus Network WiringPDF Creator - PDF4 Free Constraints Make sure the following are sufficient Air conditioning Heating Ventilation Power Protection fromelectromagnetic interference Doors that can lockPDF Creator - PDF4 Free Constraints Make sure there s space for: Cabling conduits Patch panels Equipment racks Work areas for technicians installing andtroubleshooting equipmentPDF Creator - PDF4 Free for Wireless Installations Reflection Absorption Refraction DiffractionPDF Creator - PDF4 Free the Health of the ExistingInternetwork Performance Availability Bandwidth utilization Accuracy Efficiency Response time Status of major routers, switches.

4 AndfirewallsPDF Creator - PDF4 Free AvailabilityEnterpriseSegment 1 Segment 2 SegmentnMTBFMTTRDate and Duration ofLast MajorDowntimeCause of LastMajorDowntimePDF Creator - PDF4 Free Utilization0123456717:10:0017:07:0017:04 :0017:01:0016:58:0016:55:0016:52:0016:49 :0016:46:0016:43:0016:40:00 TimeUtilizationSeries 1 Network Utilization in MinuteIntervalsPDF Creator - PDF4 Free :00:0016:00:0015:00:0014:00:0013:00:00 TimeUtilizationSeries1 Network Utilization in HourIntervalsPDF Creator - PDF4 Free Utilization byProtocolProtocol 1 Protocol 2 Protocol 3 ProtocolnRelativeNetworkUtilizationAbsol uteNetworkUtilizationBroadcastRateMultic astRatePDF Creator - PDF4 Free Packet SizesPDF Creator - PDF4 Free Response TimeNode ANode BNode CNode DNode ANode BNode CNode DXXXXPDF Creator - PDF4 Free the Status of MajorRouters, Switches.

5 And Firewalls show buffers show environment show interfaces show memory show processes show running-config show versionPDF Creator - PDF4 Free Protocol analyzers Multi Router Traffic Grapher (MRTG) Remote monitoring (RMON) probes Cisco Discovery Protocol (CDP) Cisco IOS NetFlow technology CiscoWorks Cisco IOS Service Assurance Agent (SAA) Cisco Internetwork Performance Monitor (IPM)PDF Creator - PDF4 Free Characterize the exiting internetwork beforedesigning enhancements Helps you verify that a customer s designgoals are realistic Helps you locate where new equipment willgo Helps you cover yourself if the new networkhas problems due to unresolved problems inthe old networkPDF Creator - PDF4 Free Questions What factors will help you decide if the existinginternetwork is in good enough shape to support newenhancements?

6 When considering protocol behavior, what is thedifference between relative Network utilization andabsolute Network utilization? Why should you characterize the logical structure ofan internetwork and not just the physical structure? What architectural and environmental factors shouldyou consider for a new wireless installation?PDF Creator - PDF4 Free