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The execution of the tasks may be controlled by a human coordinator or by a software system called a work ow-management system A work ow-management system consists of a scheduler, task agents, and a mechanism to query the state of the work ow system A task agent controls the execution of a task by a processing entity A scheduler is a program that processes work ows by submitting various tasks for execution, monitoring various events, and evaluating conditions related to intertask dependencies A scheduler may submit a task for execution (to a task agent), or may request that a previously submitted task be aborted In the case of multidatabase transactions, the tasks are subtransactions, and the processing entities are local database management systems In accordance with the work ow speci cations, the scheduler enforces the scheduling dependencies and is responsible for ensuring that tasks reach acceptable termination states There are three architectural approaches to the development of a work ow-management system A centralized architecture has a single scheduler that schedules the tasks for all concurrently executing work ows The partially distributed architecture has one scheduler instantiated for each work ow When the issues of concurrent execution can be separated from the scheduling function, the latter option is a natural choice A fully distributed architecture has no scheduler, but the task agents coordinate their execution by communicating with one another to satisfy task dependencies and other work ow execution requirements The simplest work ow-execution systems follow the fully distributed approach just described and are based on messaging Messaging may be implemented by persistent messaging mechanisms, to provide guaranteed delivery Some implementations use e-mail for messaging; such implementations provide many of the features of persistent messaging, but generally do not guarantee atomicity of message delivery and transaction commit Each site has a task agent that executes tasks received through messages Execution may also involve presenting messages to humans, who have then to carry out some action When a task is completed at a site, and needs to be processed at another site, the task agent dispatches a message to the next site The message contains all relevant information about the task to be performed Such.

RADIUS was developed by the Livingston Corporation, which is now owned by Lucent It is currently an open standard, defined in RFCs 2138 and 2139 However, many extensions have been added by various companies for their networking devices, making it a somewhat open standard RADIUS supports UDP for the connection between the networking device and AAA server; it only encrypts the user s password used for authentication, nothing else, making it less secure (more susceptible to eavesdropping attacks) than Kerberos or TACACS+ For example, if a user were trying to log into a router, the router would forward the authentication information (user s access method console, VTY, or other means and the username) in clear text, but would encrypt the user s password Probably RADIUS biggest advantage over the other two security protocols is that, because it was developed for dialup and networks like ISPs, it has a very robust accounting system: keeping track of when a user connected, how long he was connected, and how many bytes were transmitted to and from the user NOTE RADIUS is most commonly used on the appliances for connections going through it, like CTP and remote access VPNs RADIUS is actually required for some security features, like 8021x and LEAP RADIUS uses one UDP connection for authentication and authorization, and a second connection for accounting Depending on implementation of RADIUS, the port numbers for authentication/authorization and accounting are either 1645 and 1646, or 1812 and 1813, respectively

The McGraw Hill Companies, 2001

TACACS was originally developed for the U S Defense Department and has been updated over the years by Cisco, resulting in an enhanced version called TACACS+ Because of the many changes Cisco has made to the protocol, TACACS+ is proprietary Unlike RADIUS, TACACS+ uses TCP (port 49) for the connection to the AAA server and encrypts the entire payload contents in the security packets, making it more reliable and more secure than RADIUS TACACS+ also supports a single connection feature the networking device opens a single TCP connection to the AAA server and uses this single

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Prepare a roll-out schedule including steps and accountabilities for implementation of the sales compensation program Prepare a comprehensive outline of who, what, when, and where for the roll-out of the new sales compensation program Of course, the larger the sales organization, the more complex the roll-out effort and thus the need for a more extensive and complete roll-out documentation

message-based work ow systems are particularly useful in networks that may be disconnected for part of the time, such as dial-up networks The centralized approach is used in work ow systems where the data are stored in a central database The scheduler noti es various agents, such as humans or computer programs, that a task has to be carried out, and keeps track of task completion It is easier to keep track of the state of a work ow with a centralized approach than it is with a fully distributed approach The scheduler must guarantee that a work ow will terminate in one of the speci ed acceptable termination states Ideally, before attempting to execute a work ow, the scheduler should examine that work ow to check whether the work ow may terminate in a nonacceptable state If the scheduler cannot guarantee that a work ow will terminate in an acceptable state, it should reject such speci cations without attempting to execute the work ow As an example, let us consider a work ow consisting of two tasks represented by subtransactions S1 and S2 , with the failure-atomicity requirements indicating that either both or neither of the subtransactions should be committed If S1 and S2 do not provide prepared-to-commit states (for a two-phase commit), and further do not have compensating transactions, then it is possible to reach a state where one subtransaction is committed and the other aborted, and there is no way to bring both to the same state Therefore, such a work ow speci cation is unsafe, and should be rejected Safety checks such as the one just described may be impossible or impractical to implement in the scheduler; it then becomes the responsibility of the person designing the work ow speci cation to ensure that the work ows are safe.