TAILIEUCHUNG - The Illustrated Network- P65

The Illustrated Network- P65:In this chapter, you will learn about the protocol stack used on the global public Internet and how these protocols have been evolving in today’s world. We’ll review some key basic defi nitions and see the network used to illustrate all of the examples in this book, as well as the packet content, the role that hosts and routers play on the network, and how graphic user and command line interfaces (GUI and CLI, respectively) both are used to interact with devices. | CHAPTER Simple Network Management Protocol 24 What You Will Learn In this chapter you will learn how SNMP is used to manage devices on a TCP IP network. We ll explore the SNMP model with many servers agents and few clients managers . You will learn about MIBs and the SMI tree for designating management information . We also briefly discuss RMON remote monitor and private management information bases MIBs . Network management like network security is often treated like an adjunct to the true task of networking which is to relentlessly shuttle bits about . until something goes wrong . Then everyone wonders why it couldn t be easier to figure out what went haywire. Without network management facilities the network is like driving a car without fuel-level water-temperature or oil-pressure gauges. When the car slowly glides to a halt there are few clues of even where to start looking. The Internet outgrew the humble go-have-a-look-at-it school of network management by the late 1980s when it seemed like colleges and universities were sticking routers in every other building around the campus and then finding someone who would not object to being placed in charge of the devices. Little did they realize that they would be expected to ensure that the out-of-the-way device was functional day and night 365 days a year. They ran their portion of the Internet on a PING and a prayer. It s not that management of network devices was unknown at the time or deemed unnecessary. Vendors always had some sort of management functions tucked away in their software. The problem was that each vendor s interface was different sometimes in the same product line the client software expensive and proprietary and the network operations centers NOCs that existed tended to consist of rooms full of equipment that no one knew how to operate equally well. But knowing that network management was essential and creating a standard for network management on the Internet were two different things. The

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