Network Management in Visual C#.NET

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Network Management
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Persistence of mobile units In an environment comprised of portable devices, the persistence of the devices also becomes a factor Unlike desktop systems or other network components that operate continuously or are powered on and off daily, portable devices typically are turned on and off frequently throughout the day, making it difficult to monitor them SNMP agents The capability of devices on wired and wireless networks to host an SNMP agent also impacts network management functionality Desktop or notebook computers have adequate amounts of memory and processing power to support an SNMP agent operating as a background task handling requests from the management station With personal digital assistants (PDAs) and other handheld devices, however, memory and processing power are limited resources, making it difficult to provide agents for these devices
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The Performance of SNMP
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Managing a wireless network is a significantly more difficult task than managing a wired network One reason has to do with the unpredictable behavior of the wireless channel due to fading, jamming, and atmospheric conditions This variability of signal quality can reduce the efficiency of the management operation The bandwidth of wireless links is another issue Bandwidth will always be limited due to the properties of the physical medium and regulatory limits on the use of radio spectrum, making it necessary for network protocols to utilize the available bandwidth efficiently Using mobile agents to facilitate management offers several benefits, including reduced network traffic and the efficient utilization of processing resources On the other hand, the use of mobile agents consumes considerable resources from the agent host, which can pose a problem for mobile terminals like PDAs, and the response time in notifying the network manager depends on the wireless link quality The response time can vary from several seconds to even several minutes depending on the link condition Management functionality is unusable in situations with bad link quality and with system load at 20 percent of the whole capacity Unusable means not being able to update the whole MIB tree using SNMP s get-next operation Accordingly, a management station can manage several times the number of devices when the signal strength is good than when it is bad with the same system load The response time increases in an exponential way as the load of the system grows Using SNMP s get-bulk request, on the other hand, provides the means to retrieve much more data about a network entity as much data as is
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possible to carry in the response message This is especially useful when channel conditions are bad because the number of round-trip timeouts is reduced, which is important in maintaining performance in a wireless environment With traffic reduced between manager and agent, the probability of UDP packet loss is also much less Although measurements obtained through the get-next command are good for short transactions, such as retrieving individual objects when the query and response messages fit into a single UDP packet, if the MIB contains a considerable amount of tables, the retrieval process will involve a high number of protocol data unit (PDU) exchanges over the network In the case of bad link quality, this could make management performance worse, but when using a single get operation, it is much easier to adapt channel conditions for the current transaction The user can specify the relevant options such as timeout for the response message or the maximum number of retransmissions with respect to link quality The SNMP agent itself can provide an approximate indication of the link condition For instance, information about the number of retransmissions performed by the manager/agent application or the maximum delay time for receiving a response measured by the manager could be useful for determining WLAN performance
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