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To make a decision about which VPN protocol to use, you must not only know the related characteristics and operational details of all three, you must also have a clear picture of how all three are different. Only then can you determine which of the three can be used in a specific instance, and only then can you determine which one is the best security choice for a specific VPN. As you begin to consider which VPN protocol to use, think about these things:

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson and then try the ques tion again. Answers to the questions can be found in the Questions and Answers sec tion at the end of this chapter. 1. What is a user profile

All but the most simple of applications will have the requirement that a composite action, say, Register a User, succeeds or fails completely. In these cases, the single request is in fact a collection of many smaller pieces of work. If any of these smaller pieces fail halfway through the request, our application can be left in some inconsistent or error state. The use of transactions verifies that all compound actions comply with the ACID properties (atomicity, consistency, isolation, and durability). In other words, compound actions will either complete or fail as a single unit. EJB offers declarative and programmatic support for transactions via the Java EE TransactionManager, and it comes complete with annotations/XML to manage transactional boundaries. Our example is a transactionally aware poker service, showing the use of @TransactionAttribute and the various TransactionAttributeTypes.

3. What must you do to ensure that a user on a client computer running Windows Server 2003 has a roaming user profile

Encryption considerations include:

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Wiki article: http://community.jboss.org/docs/DOC-15573 Source location: http://github.com/jbossejb3/oreilly-ejb-6thedition-book-examples/tree/ master/ch17-transactions/

PPTP encryption begins after the PPP authentication and connection process. Therefore, the authentication process is not encrypted by MPPE. L2TP/IPSec encrypts the PPP authentication packets. This arrangement provides stronger pro tection because the authentication packet must first be decrypted before common password-cracking attacks can be used on the PPP packets.

5. Which of the following files must be renamed to configure a user profile as mandatory a. Ntuser.dat b. Ntuser.doc c. Ntuser.man d. Ntuser.txt

A user profile is a collection of folders and data that stores the user s current desktop environment, application settings, and personal data. A user profile also con tains all of the network connections that are established when a user logs on to a computer. There are four types of user profiles: local, roaming, mandatory, and temporary. A local user profile is based at the local computer and is available at only the local computer. Be able to create a local user profile. A roaming user profile is based at the server and is downloaded to the local com puter every time a user logs on and is available at any workstation or server com puter on the network. Be able to create a roaming user profile. A mandatory user profile is a read-only roaming profile, based at the server and downloaded to the local computer every time a user logs on and is available at any workstation or server computer on the network. Be able to create a manda tory user profile. A temporary user profile is issued anytime an error condition prevents a user s profile from being loaded. Temporary profiles are deleted at the end of each session. A home folder is a folder that you can provide for users to store personal docu ments, and for older applications, it is sometimes the default folder for saving doc uments. You can store a home folder on a client computer or in a shared folder on a file server. Be able to create a home folder.

PPP authentication packets, if captured, are subject to password-cracking attacks that might be successful. PPTP provides no extra protection for these packets because the encryption of PPP packets begins after PPP connection and authentication. L2TP/IPSec does provide extra protection because the PPP authentication packets are also encrypted (because user authentication occurs after the formation of an IPSec security asso ciation). A successful attacker would have to intercept the packet, defeat the IPSec ESP encryption algorithm, and then apply the password-cracking software.