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They basically had three job levels within their networking division: tier 1, tier 2, and tier 3 Tier 1 and 2 administrators were granted User EXEC access to the routers, and tier 3 workers were allowed Privilege EXEC access This sounds simple enough, but the company had a major dilemma They would never hire a tier 3 contractor, because contractors would come and go on a weekly basis, and this would mean that with each contractor departure, they would have to change all of the Privilege EXEC passwords on all of their 1,200 routers Instead, they gave their own network administrators tier 3 access, and these individuals were responsible for performing Privilege EXEC functions As you can imagine, these dozen employees were completely swamped with work trying to maintain the 1,200 routers A better solution to this problem would be to hire contractors at a tier 3 level and to give them Privilege EXEC access, offloading a lot of the work from the company s network administrators Of course, you wouldn t want to change passwords on 1,200 routers every time a tier 3 contractor left the company To solve this problem, you would use a centralized security solution Instead of having the routers and other networking devices perform authentication locally, you could have them forward the authentication requests to a centralized security server or servers, which would validate the user s identity and pass the results back to the networking devices This allows you to maintain user accounts at one location, making it easy to add and remove accounts When a tier 3 contractor is hired, you would add that person to the security server, with the appropriate security access, and when the contract is terminated, you would simply delete the account from a single security server Additionally, a good security product should also offer authorization and accounting features With authorization, you might want to control what, exactly, a tier 3 contractor could do while in Privilege EXEC mode (what commands he can execute); and with accounting, you might want a record of who logged into which networking device, what they did, and when they did it Cisco actually sells a product, called Cisco Secure ACS (CSACS), which performs the functions of a security or AAA server: it allows you to centralize the security for your networking devices, like routers, switches, security appliances, and other networking equipment NOTE CSACS is only briefly covered in this book enough to implement the features discussed here For a better overview of CSACS, read Cisco Access Control Security: AAA Administration Services by Brandon James Carroll (Cisco Press, 2004).

The work ow designer may specify the failure-atomicity requirements of a work ow according to the semantics of the work ow The traditional notion of failure atomicity would require that a failure of any task results in the failure of the work ow However, a work ow can, in many cases, survive the failure of one of its tasks for example, by executing a functionally equivalent task at another site Therefore, we should allow the designer to de ne failure-atomicity requirements of a work ow The system must guarantee that every execution of a work ow will terminate in a state that satis es the failure-atomicity requirements de ned by the designer We call those states acceptable termination states of a work ow All other execution states of a work ow constitute a set of nonacceptable termination states, in which the failureatomicity requirements may be violated An acceptable termination state can be designated as committed or aborted A committed acceptable termination state is an execution state in which the objectives of a work ow have been achieved In contrast, an aborted acceptable termination state is a valid termination state in which a work ow has failed to achieve its objectives If an aborted acceptable termination state has been reached, all undesirable effects of the partial execution of the work ow must be undone in accordance with that work ow s failure-atomicity requirements A work ow must reach an acceptable termination state even in the presence of system failures Thus, if a work ow was in a nonacceptable termination state at the time of failure, during system recovery it must be brought to an acceptable termination state (whether aborted or committed) For example, in the loan-processing work ow, in the nal state, either the loan applicant is told that a loan cannot be made or the loan is disbursed In case of failures such as a long failure of the veri cation system, the loan application could be.

To implement AAA, you need a secure protocol to transport security information between the networking device and the security (AAA) server Three security protocols commonly are used to implement AAA: Kerberos Remote Access Dial-In User Service (RADIUS) Terminal Access Controller Access Control System (TACACS+)

The McGraw Hill Companies, 2001