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ent computers that cannot perform dynamic updates. In such cases, the DHCP server becomes the owner of the record, not the computers themselves. If the downlevel client computer is later upgraded to Windows 2000 or some other operating system that is capable of performing dynamic updates, the computer will not be recognized as the owner and will consequently be unable to update its own records. A similar problem might arise if a DHCP server fails that has regis tered records on behalf of downlevel clients: none of the clients will be able to have their records updated by a backup DHCP server. To avoid such problems, add to the DnsUpdateProxy security group DHCP servers that register records on behalf of other computers. Members of this group are prevented from recording ownership on the resource records they update in DNS. This procedure consequently loosens security for these records until they can be registered by the real owner.

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Aging By clicking Aging on the General tab, you can open the Zone Aging/Scaveng ing Properties dialog box, shown in Figure 5-20. These properties provide a means of finding and clearing outdated records from the zone database.

You are a systems engineer working for Contoso Pharmaceuticals, an international corporation involved in drug manufacturing and sales. Contoso Pharmaceuticals has two main offices: the European headquarters located in Berlin and the North American headquarters located in Toronto. The corporation also has offices in Johannesburg, Atlanta, and S o Paolo. The Contoso Pharmaceuticals network configuration is shown in Figure 1-9.

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Figure 5-20

Contoso Pharmaceuticals is planning to deploy ISA Server 2004. Your boss hands you the following deployment requirements:

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Enabling Aging Aging in DNS refers to the process of placing a timestamp on a dynamically registered resource record and then tracking the age of this record. Scav enging refers to the process of deleting outdated resource records on which time-

All current firewalls will be replaced by computers running ISA Server. Additional computers running ISA Server will be deployed if required. There should be no restrictions on the flow of network traffic between any of the office locations. The existing WANs between offices will not be replaced.

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All Internet traffic flows through either Berlin or Toronto. Because the WAN links between the offices are utilized at 70 to 80 percent during business hours, this configuration needs to be changed. New Internet connections will be installed in Johannesburg, Atlanta, and S o Paolo. These Internet connections must be as secure as possible. All company Exchange Server computers are located in Berlin and Toronto. All inbound and outbound e-mail must flow through these locations. Each office hosts a public Web site, as well as a secure Web site that is used by customers. These Web sites must be available through the local Internet connection. Contoso Pharmaceuticals is deploying a new sales application in the Toronto office. This application must be accessible to sales personnel whether they are in or out of the office. When outside the office, the sales personnel must connect to the Toronto office using a VPN before being granted access to the application. You must be able to filter all traffic that flows between this application server and other servers on the internal network. Sales personnel should not be able to access any resources on the company network except for the sales application using the VPN, unless the computer they are using passes all security requirements. All users need to be able to access their e-mail on the Exchange Server computers from the Internet using a Web browser.

stamps have been placed. Scavenging can occur only when aging is enabled. Both aging and scavenging are disabled by default. To enable aging for a particular zone, you have to enable this feature both at the zone level and at the server level. To enable aging at the zone level, in the Zone Aging/Scav enging Properties dialog box, select the Scavenge Stale Resource Records check box. To enable aging at the server level, first open the Server Aging/Scavenging Properties dialog box by right-clicking the server icon in the DNS console and then clicking Set Aging/Scavenging For All Zones. Then, in the Server Aging/Scavenging Properties dia log box, select the Scavenge Stale Resource Records check box. After aging is enabled, a timestamp based on the current server time is placed on all dynamically registered records in the zone. When the DHCP Client service or DHCP server later performs a dynamic update of the records, a timestamp refresh is attempted. Manually created resource records are assigned a timestamp of 0; this value indicates that they will not be aged.

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