Network ManagementWhat is network management?Main componentsInternet management infrastructureSNMP protocolNetwork tomographySlide 7Slide 8Slide 9Why end-to-endTomography techniquesWireless network managementWireless network management: a glimpse1Network Managementintroductionmotivationmajor componentswired network managementInternet management infrastructuretomography (using end-to-end measurement)wireless network management2What is network management?Network: autonomous system, 100s or 1000s of interacting hardware/software components"Network management” includes the deployment, integration and coordination of the hardware, software, and human elements to monitor, test, poll, configure, analyze, evaluate, and control the network and element resources to meet the real-time, operational performance, and Quality of Service requirements at a reasonable cost."3Main componentsperformance/fault managementperformance issues or faulty conditions: throughput, utilization, losses, delays device or end-to-end pathconfiguration managementwhich devices are on network and their configuration?accounting managementspecify usage quota, usage-based charging, allocate resource-access priviledgesecurity managementcontrol access to network resources according to some well-defined policy4Internet management infrastructureagentdataagentdataagentdataagentdatamanaged devicemanaged devicemanaged devicemanaged devicemanagingentitydatanetworkmanagementProtocol (SNMP)definitions:managed devices containmanaged objects whose data is gathered into aManagement InformationBase (MIB) managing entity5SNMP protocolTwo ways to convey MIB info, commands:agentdataManaged devicemanagingentityresponseagentdataManaged devicemanagingentitytrap msgrequestrequest/response modetrap mode6Network tomographyGoal: obtain detailed picture of a network/internet from end-to-end viewsinfer topology /connectivity7Network tomographyGoal: obtain detailed picture of a network/internet from end-to-end viewsinfer link-levellossdelayavailable bandwidth. . .8Brain tomographyunknown objectcounting &projectionMaximumlikelihood estimateperforminferenceinverse function problemdata statistical model brain model9Network tomographyrouting &countingdataqueuing behaviorbinomialperforminferenceinverse function problem10Why end-to-endno participation by network neededmeasurement probes: regular packetsno administrative access neededinference across multiple domainsno cooperation requiredmonitor service level agreements11Tomography techniquesmany techniques have been developedusing packet correlationmulticast-based measurementunicast-based measurementnot using packet correlationusing MLE…12Wireless network managementstill in early stagechallenges (limited battery, interference, mobility)questions to be answered:what infrastructure should be used?•central managing entity? agent and MIBs at each node?•how to transfer data to managing entity?how to set power for each node?which channel should a node use?management when topology is dynamic?security management?…13Wireless network management: a glimpsewe’ll look at two papers on managing wireless LANsenterprise networks (well-planned)•fault managementhotspot networks (chaotic)•reducing
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