02 basline mapping
TRANSCRIPT
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Network Systems
Design 304
Network MappingBaselining
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Audit
Network management should start with an AuditDocument / Map the entire networkEvaluate and baseline the physical and data link layer
infrastructureEvaluate and baseline network traffic and protocolsEvaluate and baseline platforms, operating systems
and applicationsEvaluate security (Later module)
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Network Mapping
DefinitionGoalBenefitsSeven Layer OSI Reference ModelNon NetworkApplicationsIn the good old days
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Network Mapping Definition
Detailed description of everythingComplex Networks are difficult to visualise
Big RewardsTime consuming, boring!
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Network Mapping Goals
The goal of network mapping is to create aComplete;Accurate;Detailed;Up to date
Picture of the network and environs.
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Network Mapping Benefits
RequirementsJustification for costs
Fault DiagnosisProof of conformity
Reduces TrainingMight save your job!
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Network Mapping OSI
Physical LayerData Link LayerNetwork LayerTransport LayerSession LayerPresentation LayerApplication Layer
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Physical Layer
The Biggest JobEvery DeviceCabling Patch Panels
Topology and Topography
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Network Layer
InternetWANLANVPNHost NamesIP addressesPolicies
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Transport Layer
Access to ports
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Session Layer
Remote ConnectionsProtocols
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Presentation Layer
Encryption
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Application Layer
EmailEnd User Applications
PoliciesLicenses
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Non Network Information
Network Purpose StatementWhy do we have a network?Primary functionsWhat if it fails?What the network is not!
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Non Network Information cont.
Network OverviewHelp the Network Administrator find what theyare looking for fast.Outline the frameworkFAQs
Hints
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Non Network Information cont.
Physical LocationsFloor plansAddresses
Visitor entrancesDeliveriesDriving directions
Managers
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Non Network Information cont.
ResourcesAccount ManagementUsername and password for web
SignatoriesWho makes decisions?
Suppliers
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Network Mapping Tools
Open SourceNagiosOpenNMSknetmap
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Network Mapping Tools
CommercialSmartDrawVisionetVizNeon LANsurveyor
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Baselining
WhyWhat
WhenHow
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Baselining
Optimize quality of serviceGather performance data.Analyze the data.
Determine appropriate performance thresholds.
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Baseliningthe act of measuring and rating the performance of a network in real-time situations
http://www.webopedia.com/TERM/n/network_baselining.html
comparing current performance to a historical metric, or
"baselinehttp://en.wikipedia.org/wiki/Baselining
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Why BaselineTo determine normal operating conditionsTo identify and forecast problemsTroubleshootingPredict network operationPredict the ability to handle new tasks (scaling)
Optimisation
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When
Begin immediatelyLong term
Use the baseline to determine thebaseline scheduleSpecial attention areasAll levels of system activity
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HowDetermine what we have (inventory)Determine what needs to be measuredDetermine when it needs to be measuredUse the long term baseline to determine howoften items need to be measuredRepeat the measurements regularlyImplement a way of obtaining alertsImplement a way of detecting trendsCreate a data repository
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Care When BaseliningThe very act of recording data for a baselinecan skew the results
Known as measurement degradation, it may occurBecause the act of measuring an objects performance mayincrease its workloadIf too short a time interval is used when measuringWhen measuring multiple objects on a single system
A base line is not an analysis, it is a tool thatcan be used to do analysisDo not start the analysis until you map the network
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Analysis
What are normal operating conditions ?What are the peak operating conditions?
Why are the conditions the way they are?How will problems be assessed?
How will modifications be assessed?
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Glossary
ROI Return on investmentSingle Points of Failure (SPOFs)
critical componentsMTBF mean time between failure
MTTR mean time to repairAFR annualized failure rate
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GlossaryUptime amount of time the utility isavailable to users
Downtime amount of time the utility isunavailable to users
Availability percentage of time the utilityis available to the user