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formula, without considering an in nite number of potential values for z Instead, we add restrictions to prohibit expressions such as the preceding one In the tuple relational calculus, we restricted any existentially quanti ed variable to range over a speci c relation Since we did not do so in the domain calculus, we add rules to the de nition of safety to deal with cases like our example We say that an expression {< x1 , x2 , , xn > | P (x1 , x2 , , xn )} is safe if all of the following hold: 1 All values that appear in tuples of the expression are values from dom(P) 2 For every there exists subformula of the form x (P1 (x)), the subformula is true if and only if there is a value x in dom(P1 ) such that P1 (x) is true 3 For every for all subformula of the form x (P1 (x)), the subformula is true if and only if P1 (x) is true for all values x from dom(P1 ) The purpose of the additional rules is to ensure that we can test for all and there exists subformulae without having to test in nitely many possibilities Consider the second rule in the de nition of safety For x (P1 (x)) to be true, we need to nd only one x for which P1 (x) is true In general, there would be in nitely many values to test However, if the expression is safe, we know that we can restrict our attention to values from dom(P1 ) This restriction reduces to a nite number the tuples we must consider The situation for subformulae of the form x (P1 (x)) is similar To assert that x (P1 (x)) is true, we must, in general, test all possible values, so we must examine in nitely many values As before, if we know that the expression is safe, it is suf cient for us to test P1 (x) for those values taken from dom(P1 ) All the domain-relational-calculus expressions that we have written in the example queries of this section are safe.

Errors are not acknowledged and will automatically terminate the connection The one exception to this rule is if the source port number in the received packet is incorrect: in this case, an error packet is sent back to the sender If the user is on a higher-level interface and the server is on a lower-level interface, inspection for the server port number change is not required unless you have an ACL restricting traffic However, for inbound TFTP connections, you ll need to use TFTP inspection to allow the second connection (subsequent packets between the client and server) When performing inspection, if the appliance is also performing address translation, any embedded addressing information that conflicts with an entry in the xlate table will be changed in the payload and appropriately updated in the xlate table

Evaluation of program management includes the following:

When the domain relational calculus is restricted to safe expressions, it is equivalent in expressive power to the tuple relational calculus restricted to safe expressions Since we noted earlier that the restricted tuple relational calculus is equivalent to the relational algebra, all three of the following are equivalent: The basic relational algebra (without the extended relational algebra operations) The tuple relational calculus restricted to safe expressions The domain relational calculus restricted to safe expressions

12:

The McGraw Hill Companies, 2001

TFTP inspection is enabled by default in the global policy applied to all interfaces of the appliance You can disable it globally and enable it on an interface-by-interface basis, or you can control for which server(s) inspection should be performed To enable inspection of TFTP, you need to reference it in a layer 3/4 policy map:

3

ciscoasa(config)# policy-map L3/4_policy_map_name ciscoasa(config-pmap)# class L3/4_class_map_name ciscoasa(config-pmap-c)# [no] inspect tftp

We note that the domain relational calculus also does not have any equivalent of the aggregate operation, but it can be extended to support aggregation, and extending it to handle arithmatic expressions is straightforward

38 Summary

TFTP only supports layer 3/4 inspection The following example modifies the global policy to control when inspection for TFTP is done (only the specified server in the ACL, 19216811):

Conformity to plan design: How well does the application of the incentive plan match the plan documentation Accuracy of payments: How accurate are payout calculations What is the error and/or correction rate

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ciscoasa(config)# access-list tftp permit udp any host 19216811 eq 69 ciscoasa(config)# class-map L3_tftp_class_map ciscoasa(config-cmap)# match access-list tftp ciscoasa(config)# policy-map global_policy ciscoasa(config-pmap)# class inspection_default ciscoasa(config-pmap-c)# no inspect tftp ciscoasa(config-pmap)# class L3_tftp_class_map ciscoasa(config-pmap-c)# inspect tftp ciscoasa(config)# service-policy global_policy global