cis-325 data communications
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CIS-325 Data Communications. Dr. L. G. Williams, Instructor. Chapter Sixteen. Network Management. What is Network Management?. Process of controlling, monitoring, and running the network Concerned with both data and information - PowerPoint PPT PresentationTRANSCRIPT
CIS 325: Data Communications 1
CIS-325Data Communications
Dr. L. G. Williams, Instructor
CIS 325: Data Communications 2
Chapter Sixteen
Network Management
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What is Network Management?
Process of controlling, monitoring, and running the network
Concerned with both data and information
Information presupposes timely and accurate communication of data
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Management Tasks
General management: Planning, Organizing, Directing, Controlling, Staffing
Network management: All the same tasks, with specific focus
Good planning and organization reduces time spent controlling
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Ten Networking Commandments
1. Thou shalt back up thy hard disk regularly2. Thou shalt schedule downtime before doing
major work upon thy server3. Thou shalt keep thy network disk clean of old
files4. Thou shalt keep an adequate supply of spare
parts5. Thou shalt not covet thy neighbor’s network
software (and upgrade without a reason.(from Networking for Dummies, IDG, 1994)
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Ten Network Commandments, cont’d
6. Thou shalt not steal thy neighbor’s software without a license
7. Thou shalt train thy users8. Thou shalt not tinker with thine Autoexec.bat,
Config.sys, or Startnet.bat unless thou knowest what thou is doing.
9. Thou shalt not drop thy guard agains viruses10. Thou shalt write down thy network
configuration in tablets of stone. (from Networking for Dummies, IDG, 1994)
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Fault Management
Detect fault quicklyIsolate from SystemRepair/replace failed componentPredict faults based on patterns and
historyRedundant components for ‘fault
tolerance’
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Fault Management Procedures
Concerned with the human side of network performance and fault mgt
Involves the management of complaintsRequires effective problem reporting and
tracking procedures, as well as ongoing statistics on problem management
Need to track MTTR (mean time to repair) as well as MTBF (mean time between failures)
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Accounting Management
Keeping track of chargesUsage by individuals or groups
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Configuration Management
Managing and documenting hardware and software configurations Network maps System and subnet names and addresses Group and user profiles and accounts Detailed system and user documentation
Net initialization and graceful shutdown
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Performance Management
Ensuring the network is operating as efficiently as possible
Set limits such as throughput, response time
Monitoring activities on the netControlling by making adjustmentsStats important for planning
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Security Management
Encryption keysPasswords and access listsDetect unauthorized usersMaintain usage logs for auditsProvide users with confidence
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Network Management Systems
Collection of tools for Monitoring and Controlling
Hardware and softwareMonitor status and performance of
all componentsS/W resident in components
Runs in background
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Network Management Entity
Collect and store statsXmit status to Control CenterChange unit parameters if necessaryPerform testsAlert Central Control to problems
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Network Control Center
One unit in system designatedS/W here controls all NMEsProvides user interface for Net.
ManagerOften a backup system avail for
emergiencies
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Network Management Software
Often self-configuring; they will search out active devices and include them in a logical map of the network (you must still develop a corresponding physical map)
Increasingly, network devices are “smart”; the record performance data and send it to a monitoring facility so that changes can be quickly and easily detected
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Technical Control
Availability is keyNeeds
Automatic test and monitor Restore or reconfigure - NOW! Performance stats for planning
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Component Tech Control
Monitor traffic to/from a stationLine Monitor
“traps signals to provide precise oicture of line activity”
Generate test signals Analog can measure attenuation and
distortionProtocol Analyzer
Active - simulates other hardware
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Network Tech Control
Too many line monitors to keep track ofSystem control integrates all monitorsUses leased lines outside netRemote control of h/w and s/w from
Central ControlCentral Control is interface for Manager
diagnose problems, isolate faults, restore ops
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Performance Monitoring
Second most key characteristicCollect data about response time,
throughput, and utilizationUse data to assess problems and
develop solutions
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Component Monitoring
Response time monitor portable times event from send until answer is back determines Min, Max, and Avg time
Hardware Monitor measures what happens in a component time of an event, or number of events passive device
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Component Monitoring
Software monitors s/w resident in a station gathers and reports statistics monitor complete events or take
snapshots no special hardware required will affect system as it monitors
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Network Monitoring
Continuously measure and analyze parameters
Central monitor stationData arrives by leased lines, not netData collection modules at each
stationAble to monitor multi-vendor systemsParameters listed in Table 16-3, p. 489
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Network Management Standards: SNMP
Simple Network Management ProtocolDeveloped to manage TCP/IP networksDevices collect info about themselves,
store it in a mgt. information base (MIB)Management station can monitor and
reset MIB databaseSingle system can monitor 100’s of
stations