This guide is written for field consultants, users and administrators of the HP Network Node Manager (NNM) software product. The second edition covers information that is relevant for NNM product versions 6.0 through 7.53 with Intermediate Patch 20. It does not cover NNM 8i, which is an entirely new and different product (see page 287). It was written for those who seek a shortcut to commonly used product info that is either missing or obfuscated in the product docs, and it covers practical implementation information that can‟t be found in any product documentation or the fine product manual or reference pages. This guide was gleaned from OpenView users and from the author‟s fifteen years of compiled notes on the product.So, what is NNM? NNM is a scalable enterprise network fault management tool that provides SNMP manager features, network discovery, OSI layer 2 and layer 3 topology mapping, network device status polling, third party integration APIs and some limited reporting, performance and trend analysis capabilities. It is the most popular enterprise-class network management tool for managing IP networks.The terms “OpenView” and “NNM” have been used synonymously for many years, but it has never been accurate to mix these terms. NNM is a discreet product within the OpenView software product suite. A list of some of the more popular and relevant HP Software products are listed on page 300.Shortly after its acquisition of Mercury Interactive in 2007, HP dropped the use of “OpenView” in all its software products and branded all software under the HP umbrella “HP Software.” “HP OpenView Network Node Manager” thus became “HP Network Node Manager.” The author‟s expectation is that NNM will still be referred to as “OpenView” for at least another decade.