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interval T In this situation, it is assumed that the coordinator has failed, and Si tries to elect itself as the site for the new coordinator Site Si sends an election message to every site that has a higher identi cation number Site Si then waits, for a time interval T, for an answer from any one of these sites If it receives no response within time T, it assumes that all sites with numbers greater than i have failed, and it elects itself as the site for the new coordinator and sends a message to inform all active sites with identi cation numbers lower than i that it is the site at which the new coordinator resides If Si does receive an answer, it begins a time interval T , to receive a message informing it that a site with a higher identi cation number has been elected (Some other site is electing itself coordinator, and should report the results within time T ) If Si receives no message within T , then it assumes the site with a higher number has failed, and site Si restarts the algorithm After a failed site recovers, it immediately begins execution of the same algorithm If there are no active sites with higher numbers, the recovered site forces all sites with lower numbers to let it become the coordinator site, even if there is a currently active coordinator with a lower number It is for this reason that the algorithm is termed the bully algorithm

ciscoasa(config)# router ospf process_ID ciscoasa(config-router)# area area_# authentication [message-digest]

In 14, we saw that there are a variety of methods for computing the answer to a query We examined several techniques for choosing a strategy for processing a query that minimize the amount of time that it takes to compute the answer For centralized systems, the primary criterion for measuring the cost of a particular strategy is the number of disk accesses In a distributed system, we must take into account several other matters, including The cost of data transmission over the network The potential gain in performance from having several sites process parts of the query in parallel The relative cost of data transfer over the network and data transfer to and from disk varies widely depending on the type of network and on the speed of the disks Thus, in general, we cannot focus solely on disk costs or on network costs Rather, we must nd a good tradeoff between the two

4:

Consider an extremely simple query: Find all the tuples in the account relation Although the query is simple indeed, trivial processing it is not trivial, since the account relation may be fragmented, replicated, or both, as we saw in Section 192 If the account relation is replicated, we have a choice of replica to make If no replicas are fragmented, we choose the replica for which the transmission cost is lowest However, if a replica is fragmented, the choice is not so easy to make, since we need to compute several joins or unions to reconstruct the account relation In this case,

For MD5, you need the message-digest parameter Without it, clear-text keys are used for authentication instead of MD5 signatures After enabling authentication for an area or areas, you ll need to configure authentication on the interface(s) that will be using it:

The McGraw Hill Companies, 2001

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ciscoasa(config)# interface interface_name ciscoasa(config-if)# ospf authentication [message-digest | null] ciscoasa(config-if)# ospf authentication-key key ciscoasa(config-if)# ospf message-digest-key key_# md5 key

($112,000 $80,000)/$64,000 x 100 = 2% (125 100)