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Configuring Cache Cleaner The Cache Cleaner functionality is enabled by default To further refine your configuration, under the Remote Access VPN tab go to Secure Desktop Manager | Default | Cache Cleaner (see Figure 27-27) This figure shows the options for configuring the Cache Cleaner feature The Launch Hidden URL After Installation option checks for a URL for administrative purposes that is hidden from the remote user This is used so that you know that the user has the Cache Cleaner installed For example, you could create a cookie file on the user s PC and then later check for the presence of the installed cookie The Secure Delete option specifies the number of passes of random writes over downloaded content (following DoD standards), ensuring that someone who tries to examine the disk space after the fact has less of a chance deciphering what was downloaded Configuring Secure Desktop General Attributes To configure the general attributes for the Secure Desktop, under the Remote Access VPN tab, go to Secure Desktop Manager |

The McGraw Hill Companies, 2001

Default | Secure Desktop General The following options are available on the Secure Desktop General screen, shown in Figure 27-28: Enable switching between Secure Desktop and Local Desktop Cisco strongly recommends that you enable this to let users switch between Secure Desktop and the untrusted desktop This feature is called desktop switching and provides users with the flexibility they might need to respond to a prompt from another application requiring an okay to let Secure Session continue processing Unchecking this option minimizes the possible risk where a user might leave traces on the untrusted desktop Enable Vault Reuse Checking this option allows users to close Secure Session and open it again later, sort of like a save feature The Secure Session becomes a persistent desktop that is available from one session to the next If you enable this option, users must enter a password to re-access and restart the Secure Session This option is useful if users are running Secure Session on PCs that

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where client and server machines have exactly the same power Would it make sense to build a client server system in such a scenario Why Which scenario would be better suited to a data-server architecture 185 Consider an object-oriented database system based on a client-server architecture, with the server acting as a data server a What is the effect of the speed of the interconnection between the client and the server on the choice between object and page shipping b If page shipping is used, the cache of data at the client can be organized either as an object cache or a page cache The page cache stores data in units of a page, while the object cache stores data in units of objects Assume objects are smaller than a page Describe one bene t of an object cache over a page cache 186 What is lock de-escalation, and under what conditions is it required Why is it not required if the unit of data shipping is an item 187 Suppose you were in charge of the database operations of a company whose main job is to process transactions Suppose the company is growing rapidly each year, and has outgrown its current computer system When you are choosing a new parallel computer, what measure is most relevant speedup, batch scaleup, or transaction scaleup Why 188 Suppose a transaction is written in C with embedded SQL, and about 80 percent of the time is spent in the SQL code, with the remaining 20 percent spent in C code How much speedup can one hope to attain if parallelism is used only for the SQL code Explain 189 What are the factors that can work against linear scaleup in a transaction processing system Which of the factors are likely to be the most important in each of the following architectures: shared memory, shared disk, and shared nothing 1810 Consider a bank that has a collection of sites, each running a database system Suppose the only way the databases interact is by electronic transfer of money between one another Would such a system qualify as a distributed database Why 1811 Consider a network based on dial-up phone lines, where sites communicate periodically, such as every night Such networks are often con gured with a server site and multiple client sites The client sites connect only to the server, and exchange data with other clients by storing data at the server and retrieving data stored at the server by other clients What is the advantage of such an architecture over one where a site can exchange data with another site only by rst dialing it up.