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2012-12-06 08:34:17
Chapter Network Management

Chapter 2 network management
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  1. What is the principle difference between the SGMP and the SNMP?
    The Simple Gateway Management Protocol (SGMP) was the precursor to the Simple Network Management Protocol (SNMP). It was designed to manage only objects of relevance to Gateways (Routers); for example the number of Gateway ports. This capability was considered sufficient at the time. Today, SNMP can manage objects relevant to any device that has an SNMP agent installed.
  2. What is a MIB?
    A MIB is a virtual Management Information Base for a device. Each object in a MIB has an Object Identifier that defines its location in the iso tree of objects. An object contains a configured value for a device such as an IP address. These values are accessed or changed by a Network Management System (NMS) in order to manage the device. The use of the adjective virtual means that the values of objects are not centralized but maintained by relevant software such as the network driver for the device.
  3. What principle feature did the RMON1 standard add to the MIB-2 standard?
    The RMON 1 standard added network-based MIB objects. These objects contained values that specified network performance rather than device performance. An example is the number of packets on the network from a specific Ethernet address. A special device called a network monitor or probe was used to capture packets on a network segment and determine these values for the segment.
  4. What is the function of an agent process on a Management Agent?
    The agent process is a virtual Database Manager. It accesses requested values of device objects directly or uses the support of a specialized subagent to do so. These values are the delivered to the protocol SNMP for return to the NMS.
  5. Should we always strive for more network management?
    The degree of network management is a tradeoff between management information desired and the network traffic required to obtain that information. Too much network management will reduce network performance.
  6. What network management protocol does the OSI protocol stack use?
    The OSI protocol stack uses the CMIP for network management. CMIP stands for Common Management Information Protocol. It is more comprehensive than SNMP.
  7. What function does CMIP play in the OSI reference Model?
    CMIP is the management protocol of the OSI Application layer
  8. Why are some vendors hesitant to incorporate an SNMP agent on their devices?
    Because device management reduces cycle time available to the device for performing its primary functions.
  9. Did SNMP become a de facto or de jure Internet standers?
    SNMP is a de facto Internet standard because its pervasiveness exists by agreement of the users that evolved by the use of RFCs rather than committee.