Pmerchant eBusiness-L07- 1 Network Management A Network is a complex mixture of hardware and software technologies linked by networking technologies
May 25, 2015
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Network Management
A Network is a complex mixture of hardware and software technologies linked by networking technologies
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Desktop Admin
LAN InfrastructureNet Mgmt
WAN Net Mgmt
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Reasons for Network Management
• Proactively detecting failures of equipment before the users are aware.
• Monitoring traffic to aid in resource deployment
• Detecting mis-configured elements• Monitoring for SLA’s• Intrusion Detection
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Figure 12-11 Client/Server Infrastructure Architecture: Systems Administration and EnterpriseNetwork Management
Systems Administration Process Enterprise Network Management Process
Client management Server management Configuration management Desktop management Fault tolerance and availability management Distributed application management Help desk management
Tools
Software distribution License metering Inventory tracking Asset control Trouble ticketing Desktop management systems
LAN management Remote access management Internetworking device management Internet/World Wide Web management WAN management
Tools
Enterprise network management systems Network analyzers and remote monitor tools Network baselining tools Network modeling and simulation tools Network auditing tools
WAN services
Internet and WWW
clients servers
clients servers
hub
hub
GOLDMAN & RAWLES: ADC 3e FIG: 12-11
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Distributed IT Infrastructure Architecture
• Define the Components?– Servers &– Networks that connect Servers to each other & to
the clients they serve• No right/wrong way to divide
processes/responsibility• System Administration: Mgmt of Clients,
servers, OS’s & NOS’s that allow computers to communicate
• Enterprise Network Management
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Elements of IT Infrastrucuture that must be managed
• Enterprise network• LAN Management• Server Management• Desktop Management• Database Management• Application Management• Remote Access Management
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OSI Network Management Framework
• Fault Management• Configuration Management• Performance Management• Security Management• Accounting Management
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TMN Model
Telecommunication Management Network standards from ITU
• Business Management• Service Management• Network Management• Element Management
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IT Infrastructure Management
• A Challenge as IT Infrastructure is made up of a combination of separately managed and Monitored Elements
• Different management tools often do not interoperate or share Data
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Architecture
• Agents are S/W that runs on networking devices to monitor and report– Must be compatible with the NMS
• NMS Compiles, Displays, Reports and Alarms
• Stores data in a Database– Database has an Index and standardised field
definitions = MIB– Fields within MIBs known as Objects
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From: SUN Solstice TMN manager White Paper
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Protocols
• Protocol used to communicate between agents & NMS is SNMP
• Management traffic can be up to 30% – Affects network you are monitoring– Now available: Distributed Management
• sub-NMSs
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Protocols
• New: Web Based Management = WBEM• uses HMMP - Hypermedia Management
protocol– Replace SNMP and DMI?
• Advantages:– Common Interfaces for all devices– NMS is Platform Independent
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RMON
• Remote Monitoring• RMON Probes - An Agent that collects and
reports performance statistics to an NMS
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Network Analysers
• Ie Sniffer, Lanwatch• Monitor at a single point on a network• Can display data from most of the OSI layer
separately
• I do not consider Physical layer testers such as cable scanners, signal quality monitors, BERT testers.
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References
• Goldman Chapter 12• Kurose & Ross
• Stallings Chapter 19
• Tanenbaum Chapter 7.3