how to generate qr code using vb.net Distributed Network Monitoring Distributed Network Monitoring in Software

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Simple Network Management Protocol (SNMP) Simple Network Management Protocol version 2 (SNMPv2) SNMP Remote Monitoring (RMON) Management Information Base (MIB) Remote Monitoring version 2 (RMON2) MIB
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2941 Simple Network Management Protocol (SNMP)
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The Simple Network Management Protocol (SNMP) was a draft standard in 1988 and was ratified by the IETF in April, 1989 SNMP is described in full in an IETF Request For Comment (RFC), a detailed technical description that itemizes all the components of SNMP Each RFC is given a number that distinctly identifies it SNMP is RFC 1098 of the IETF SNMP has three basic components; their relationship is shown in Figure 299 The agent (the collector and sender of information) is a software program that resides in a managed element, or device, of the network such as a hub, router, or a specialized dedicated data collector The manager (the receiver of information) communicates with the agent by using SNMP commands A Management Information Base (MIB) is a database that resides within the agent and holds information in the various data fields that the database is designed to address RMON is a MIB with a specific set of fields described in more detail subsequently in this section Communication between agent and manager takes place with five types of commands:
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Get request Get-Next request
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more Manager: Manages one oron a agents Normally resides computer and communicates to one or more agents in the network
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Responds Agent : Collects data from an to get/set statements SNMP Manager and sends traps to specified destinations Agent Agent
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and MIB: Resides on the Agentrecall stores information for later by an SNMP Manager
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Agent 2
Figure 299 A manager communicates with agents distributed around the network The agents collect and
store information in databases designed specifically for one purpose, called Management Information Bases (MIBs) SNMP specifies exactly how the communication between manager and agent transpires Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Distributed Network Monitoring 694 Network Test Instrumentation
Set request Get response Trap
With a Get request, a manager requests (from an agent) the value of some variable stored in a field of the database that represents a particular MIB A Get-Next request is used by a manager to request information on multiple variables, efficiently using the network (reducing traffic) to communicate more than one piece of information at a time If any one variable is unavailable, no values are returned This command also is used to retrieve unknown database rows (if available) With a Set request, a manager instructs an agent to set a specific MIB variable (one of the fields in the database) to a desired value A Get response is sent by an agent as a response to a Set request or Get-Next command; its form depends on what was requested Examples are:
An error message A response identical to the variable sent in the Set request (showing it was accepted), or Actual database values, as requested in a Get-Next
The manager checks its list of previously sent requests to locate the one that matches this response and, if none is found, the response is discarded; otherwise it is processed further A trap is one of two unsolicited messages sent from an agent to a manager, often used for out-of-norm event notification when the agent sees something that the manager should know about
2942 SNMP version 2
The SNMP standard brings several advantages to the rapid adoption and growth in use of network management applications: 1 The protocol is easy to implement 2 The protocol requires few resources to operate 3 The protocol is mature, stable, and well understood 4 The protocol is widely available (on most computers) and most network devices have some form of embedded agent/MIB As networks have grown and the need for network management has become more imperative, several disadvantages of SNMP have become apparent For example, as a polling-based protocol, each agent is responsible for sending information to the manager as requested Depending on the number of agents deployed on a network, the amount of traffic this imposes on the network can be burdensome and resource intensive, both in bandwidth utilized to communicate and in processing power to analyze the information
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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