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green if they are healthy. If a device begins to approach a preestablished threshold of performance, the icon on the map that represents that device turns yellow, and if it fails entirely it turns red, yells loudly, and automatically reports and escalates the trouble. In one of his many books on American management practices, USC Professor Emeritus Warren Bennis observes that the business of the future will be run by a person and a dog. The person will be there to feed the dog; the dog will be there to make sure the person doesn t touch anything. Clearly that model applies here. So, how can this ideal model of network management be achieved Every vendor will tell you that its element-management system is the best element manager ever created. None of them are willing to change the user interface that they have created so carefully. Using a canonical form, however, there is no reason to. All that has to be done is to exact an agreement from all vendors that stipulates that while they do not have to change their user interface, they must agree to speak some form of technological Esperanto on the back side of their device. That way, the users still get to use the interface they have grown accustomed to, but on the network side, every management system will talk to every other management system using a common and widely accepted form. Again, it s just like a canonical language: If people from five different language groups need to communicate, they have a choice. They can each learn everybody else s language (four additional languages per person) or they can agree on a canonical language (Esperanto), which reduces the requirement to a single language each. In network management, there are several canonical forms. The most common are ISO s Common Management Information Protocol (CMIP), the IETF s Simple Network Management Protocol (SNMP), and the Object Management Group s Common Object Request Brokered Architecture (CORBA). As long as every manager device agrees to use one of these on the network side, every system can talk to every other system. Other canonical forms found at the Application Layer include ISO s X.400/X.500 Message Handling Service (Quiz: Where would you find these ) and the IETF s Simple Mail Transfer Protocol (SMTP) for e-mail applications; ISO s File Transfer, Access, and Management (FTAM), the IETF s File Transfer Protocol (FTP), and the Hypertext Transfer Protocol (HTTP) for file transfer; and a host of others. Note that the services provided at this layer are highly specific in nature: They perform a limited subset of tasks.
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Layer Six: The Presentation Layer
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For our e-mail example, let s assume that the Application Layer converts the PC-specific information to X.400 format and adds a header that will tell the receiving device to look for X.400-formatted content. This is not a difficult concept; think about the nature of the information that must be included in any e-mail encoding scheme. Every system must have a field for the following:
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Sender (From) Recipient (To) Date Subject Cc Bcc Attachment Copy Message body Signature (optional) Priority Various other miscellaneous fields
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The point is that the number of defined fields is relatively small, and as long as each mail system knows what the fields are and where they exist in the coding scheme of the canonical standard, it will be able to map its own content to and from X.400 or SMTP. Problem solved. Once the message has been encoded properly as an e-mail message, the Application Layer passes the now slightly larger message down to the Presentation Layer. It does this across a layer-to-layer interface using a simple set of commands called service primitives. The Presentation Layer provides a more general set of services than does the Application Layer, which have to do with the structural form or syntax of the data. These services include code conversion, such as sevenbit ASCII to eight-bit EBCDIC translation; compression, using such services as PKZIP, British Telecom Lempel-Ziv, the various releases of the Moving Picture Experts Group (MPEG), the Joint Photographic Experts
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