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Not all appliances support failover All the ASAs support failover; however, the ASA 5505 doesn t support active/active failover (see the Failover Implementations section) Of the PIXs, only the 515s and higher support failover The Firewall Services Module (FWSM) also supports failover NOTE The FWSM is a card for the Catalyst 6500 and the router 7600 chassis Its operating system is based on the same operating system used by the appliances Unlike the appliances, it has no physical interfaces Instead, all its interaction is with its connected switch or router via trunked VLANs Most of the configuration is very similar to the appliances, but some, like the initial setup of the logical/ VLAN interfaces, is different A discussion on using and configuring the FWSM is beyond this book

We may assign a user several forms of authorization on parts of the database For example, Read authorization allows reading, but not modi cation, of data Insert authorization allows insertion of new data, but not modi cation of existing data Update authorization allows modi cation, but not deletion, of data Delete authorization allows deletion of data We may assign the user all, none, or a combination of these types of authorization In addition to these forms of authorization for access to data, we may grant a user authorization to modify the database schema: Index authorization allows the creation and deletion of indices Resource authorization allows the creation of new relations Alteration authorization allows the addition or deletion of attributes in a relation Drop authorization allows the deletion of relations The drop and delete authorization differ in that delete authorization allows deletion of tuples only If a user deletes all tuples of a relation, the relation still exists, but it is empty If a relation is dropped, it no longer exists We regulate the ability to create new relations through resource authorization A user with resource authorization who creates a new relation is given all privileges on that relation automatically Index authorization may appear unnecessary, since the creation or deletion of an index does not alter data in relations Rather, indices are a structure for performance enhancements However, indices also consume space, and all database modi cations are required to update indices If index authorization were granted to all users, those who performed updates would be tempted to delete indices, whereas those who issued queries would be tempted to create numerous indices To allow the database administrator to regulate the use of system resources, it is necessary to treat index creation as a privilege

For the hardware between the two appliances, the only thing that doesn t have to be the same is the flash memory size all other components must be the same For example, you could use two 5510s, but not a 5510 and a 5520 You could use two ASA 5540s, but not if one had an IPS card and the other didn t Basically, with the exception of flash, the hardware between the two units must be identical: same models, same interfaces and cards, same amount of RAM, and so on If you had PIXs running version 6 or earlier, the two PIXs in failover had to be running the same OS image and the same PIX Device Manager (PDM) image (ASDM is the replacement for PDM and is discussed in 27) For example, if one PIX were running version 63(4) and the other were running 63(5), failover wouldn t work they would have to be running exactly the same version of software in version 6 and earlier Starting in version 7, Cisco slightly loosened the software requirements: the minor releases had to match up, but not subreleases within a minor release For example, if one appliance were running 71(1) and the other 71(2), the two appliances could participate in failover; however, if one were running 70(4) and the other were running 71(2), failover would fail

We can implement projection easily by performing projection on each tuple, which gives a relation that could have duplicate records, and then removing duplicate records Duplicates can be eliminated by the methods described in Section 1361 If the attributes in the projection list include a key of the relation, no duplicates will exist; hence, duplicate elimination is not required Generalized projection (which was discussed in Section 331) can be implemented in the same way as projection

Connection limits are commonly used to prevent connection and flood attacks You can have different connection policies for different applications, servers, users, or a combination of the three These can include number of connections, timeouts, and randomization