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You must make available multiple copies of DNS data or zone information. These cop ies provide backup, redundancy, and load balancing. The information needs to be the same on each server, and the traditional method of synchronization is to provide one zone replication between primary and secondary DNS servers. That is, all changes to zone data are made on the primary DNS server and replicated to one or more second ary servers. An alternative method is provided by Windows Server 2003 and Windows 2000 DNS services when they are installed as Active Directory Integrated. In this case, zone information is shared using Active Directory replication. The early DNS servers on the network that became the Internet were configured to allow zone replication to any DNS server. This configuration is not the one to use on your DNS servers today. Many years ago, there were few DNS servers, and letting everyone know how to reach you on the Internet was most important. No one envi sioned that they would need to protect this knowledge.

Probably the most obvious and certainly the most simple, is to ask the ITS department to del egate the domain name research.graphicdesigninstitute.com namespace to the Research department. The other option would be to have the Research department manage those por tions of the namespace that include SRV records. Those portions begin with _msdcs, _sites, tcp, and _udp. Delegation is only necessary if other departments and/or users from the Internet need to be able to contact the Research domain resources and hosts using host names.

6. If the Research department decides to handle its own DNS namespace and they want the most secure dynamic DNS configuration possible, what would you expect to configure

package org.jboss.ejb3.examples.ch05.encryption; import java.net.MalformedURLException; import java.net.URL; import javax.ejb.EJB; import junit.framework.TestCase; import import import import import import import org.jboss.arquillian.api.Deployment; org.jboss.arquillian.junit.Arquillian; org.jboss.logging.Logger; org.jboss.shrinkwrap.api.ShrinkWrap; org.jboss.shrinkwrap.api.spec.JavaArchive; org.junit.Test; org.junit.runner.RunWith;

Note Dnscmd.exe is a utility that can be used at the command line or incorporated into a script. If many DNS servers must be secured, writing a script that includes these commands is useful. Dnscmd commands are identified in the practice.

Set the Research department s DNS servers to support Secure Only updates. This will work as long as all Research department computers are members of the Active Directory domain.

For today s networks, however, there is no reason to leave this opportunity for infor mation theft open. If you expose your internal DNS data via zone replication, an intruder might use a zone transfer to find out information about the servers on your network, such as the names and IP addresses of domain controllers, mail servers, inter nal web servers and databases, and more. This information might be used to mount an attack against critical or sensitive servers on your network. Securing DNS zone replication must be done. If Windows Server 2003 DNS servers are used, use one of the following configurations:

7. If the Research department wants to allow non-domain members or even nonMicrosoft computers to update Windows Server 2003 computers configured as DNS servers, what type of updates must you allow

/** * Integration tests for the EncryptionEJB * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> */ @RunWith(Arquillian.class) public class EncryptionIntegrationTestCase extends EncryptionTestCaseSupport { // ---------------------------------------------------------------------------|| // Class Members -------------------------------------------------------------|| // ---------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(EncryptionIntegrationTest Case.class); /** * The EJB 3.x local business view of the EncryptionEJB */ @EJB private static EncryptionLocalBusiness encryptionLocalBusiness;

Exam Objectives in this :

Use Active Directory replication. The best benefits are obtained by using Active Directory replication. This traffic is automatically encrypted; therefore, zone replication traffic also is. Domain controllers authenticate to each other, ensuring that the zone replication traffic goes to authorized servers. To use Active Directory replication, select Active Directory Integrated zones when configuring DNS. When this is done, zone transfer is disallowed, as shown in Figure 3-3.

Set an Active Directory forest and domain functional level based upon requirements Manage schema modifications Add or remove a UPN suffix Restore Active Directory directory service Perform an authoritative restore Perform a nonauthoritative restore Diagnose and resolve issues related to the Active Directory database

3-30

/** * Correlates to the env-entry within ejb-jar.xml, to be used as an override from the default */ private static final String EXPECTED_CIPHERS_PASSPHRASE = "OverriddenPassword"; /** * Correlates to the env-entry within ejb-jar.xml, to be used as an override from the default */ private static final String EXPECTED_ALGORITHM_MESSAGE_DIGEST = "SHA"; /** * Define the deployment */ @Deployment public static JavaArchive createDeployment() throws MalformedURLException { final JavaArchive archive = ShrinkWrap.create("slsb.jar", JavaArchive.class ).addClasses(EncryptionBean.class, EncryptionCommonBusiness.class, EncryptionLocalBusiness.class, EncryptionRemoteBusiness.class, EncryptionException.class).addManifestResource( new URL(EncryptionIntegrationTestCase.class.getProtectionDomain().get CodeSource().getLocation(), "../classes/META-INF/ejb-jar.xml"), "ejb-jar.xml"); //TODO SHRINKWRAP-141 Make addition of the ejb-jar less verbose log.info(archive.toString(true)); return archive; } // ---------------------------------------------------------------------------|| // Tests ---------------------------------------------------------------------|| // ---------------------------------------------------------------------------|| /* * These tests will use the EJB set up in test initialization */ /** * @see {@link EncryptionTestCaseSupport#assertHashing(EncryptionCommon Business)} */ @Test public void testHashing() throws Throwable { // Log log.info("testHashing"); // Test via superclass this.assertHashing(encryptionLocalBusiness);