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We present three basic data-partitioning strategies Assume that there are n disks, D0 , D1 , , Dn 1 , across which the data are to be partitioned Round-robin This strategy scans the relation in any order and sends the ith tuple to disk number Di mod n The round-robin scheme ensures an even distribution of tuples across disks; that is, each disk has approximately the same number of tuples as the others Hash partitioning This declustering strategy designates one or more attributes from the given relation s schema as the partitioning attributes A hash function is chosen whose range is {0, 1, , n 1} Each tuple of the original relation is hashed on the partitioning attributes If the hash function returns i, then the tuple is placed on disk Di Range partitioning This strategy distributes contiguous attribute-value ranges to each disk It chooses a partitioning attribute, A, as a partitioning vector The relation is partitioned as follows Let [v0 , v1 , , vn 2 ] denote the partitioning vector, such that, if i < j, then vi < vj Consider a tuple t such that t[A] = x If x < v0 , then t goes on disk D0 If x vn 2 , then t goes on disk Dn 1 If vi x < vi+1 , then t goes on disk Di+1 For example, range partitioning with three disks numbered 0, 1, and 2 may assign tuples with values less than 5 to disk 0, values between 5 and 40 to disk 1, and values greater than 40 to disk 2

The McGraw Hill Companies, 2001

4 The security server examines its internal authentication table for the username and password and what service this user is allowed access to the security server sends either an allow or deny message to the appliance If the appliance receives an allow message, it adds the user s connection information to the conn table and permits the connection If the appliance receives a deny message, it drops the user s connection, or, possibly, reprompts the user for another username/password combination

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Once the user has been authenticated, all traffic will be processed by the appliance primarily at layers 3 and 4 of the OSI Reference Model, since the user s connection is placed in the conn table This is different from your traditional Application layer proxy, where all traffic, from the authentication phase to the user s actual data traffic, is processed at layer 7 of the OSI Reference Model With CTP, the authentication phase is processed at layer 7, but data traffic is, for the most part, processed at layers 3 and 4 NOTE Cut-through Proxy authenticates the connection at the application layer, but processes the subsequent data stream at layers 3 and 4 The CTP feature is susceptible to eavesdropping because the username and password are sent across the network in clear text; this can be alleviated by using HTTPS instead of telnet, FTP, or HTTP, since HTTPS uses SSL for encryption If a hacker happened to be eavesdropping on a clear-text connection while the username and password were being transferred to the appliance, the hacker could use this information to gain unauthorized access to your internal network You could remove this weakness either by using onetime passwords (OTPs) or by using a smartcard system where the smartcard-generated key is only valid once Another problem with the CTP process is that the user might have to authenticate twice: once via CTP, and then again at the actual end-server the user is attempting to access CTP is discussed in 8