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Bottom-up integration provides a limited set of incremental-integration advantages. It restricts the possible sources of error to the single class being integrated, so errors are easy to locate. Integration can start early in the project. Bottom-up integration also exercises potentially troublesome system interfaces early. Since system limitations often determine whether you can meet the system s goals, making sure the system has done a full set of calisthenics is worth the trouble. What are the problems with bottom-up integration The main problem is that it leaves integration of the major, high-level system interfaces until last. If the system has conceptual design problems at the higher levels, construction won t find them until all the detailed work has been done. If the design must be changed significantly, some of the low-level work might have to be discarded. Bottom-up integration requires you to complete the design of the whole system before you start integration. If you don t, assumptions that needn t have controlled the design might end up deeply embedded in low-level code, giving rise to the awkward situation in which you design high-level classes to work around problems in low-level ones. Letting low-level details drive the design of higher-level classes contradicts principles of information hiding and objectoriented design. The problems of integrating higher-level classes are but a teardrop in a rainstorm compared to the problems you ll have if you don t complete the design of high-level classes before you begin low-level coding. As with top-down integration, pure bottom-up integration is rare, and you can use a hybrid approach instead, including integrating in sections.

5-37

SOA query for zone SOA query answer (zone status) IXFR or AXFR query for zone IXFR or AXFR query answer (zone transfer)

Figure 29-8 As an alternative to proceeding purely bottom to top, you can integrate from the bottom up in sections. This blurs the line between bottom-up integration and featureoriented integration, which is described later in this chapter.

date the computer certificate of the VPN or IAS server, select Validate Server Certificate. If you want to configure the names of the authenticating servers, select Connect To These Servers and type the server names. To require the server s computer certificate to have been issued a certificate from a specific set of trusted root CAs, select them in Trusted Root Certification Authorities. To configure EAP-TLS authentication on the VPN server, EAP must be enabled as an authentication type on the Authentication Methods dialog box available from the Security tab in the properties of the VPN server in the Routing And Remote Access snap-in. To configure EAP-TLS authentication on the remote access policy that is being used for VPN connections, the Smart Card Or Other Certificate EAP type must be added to the selected EAP providers from the Authentication tab on the policy s profile settings. If the computer on which the remote access policy is being configured has multiple computer certificates installed, configure the properties of the Smart Card Or Other Certificate EAP type and select the appropriate computer certificate to submit during the EAP-TLS authentication process.

Figure 5-26

Note You do not need to configure zone transfers or notification among domain controllers or DNS servers in Active Directory integrated zones. For the servers within these zones, transfers are conducted automatically.

The problems with pure top-down and pure bottom-up integration have led some experts to recommend a sandwich approach (Myers 1976). You first integrate the high-level business-object classes at the top of the hierarchy. Then you integrate the device-interface classes and widely used utility classes at the bottom. These high-level and low-level classes are the bread of the sandwich. You leave the middle-level classes until later. These make up the meat, cheese, and tomatoes of the sandwich. If you re a vegetarian, they might make up the tofu and bean sprouts of the sandwich, but the author of sandwich integration is silent on this point maybe his mouth was full. Here s an illustration of the sandwich approach:

In this practice, you create a secondary zone and then configure zone transfers between the two zones.

The use of registry-based user certificates for user authentication can be used in place of smart cards. However, it is not as strong a form of authentication. With smart cards, the user certificate issued during the authentication process is made available only when the user physically possesses the smart card and has knowl edge of the PIN to log on to her computer. With user certificates, the user certificate issued during the authentication process is made available when the user logs on to her computer using a domain-based user name and password. Just as with smart cards, authentication using user certificates for remote access VPN connections use EAP-TLS as the authentication protocol. Deploying user certificates in your organization consists of the following steps: 1. Deploy a certificate infrastructure. For more information, see Appendix C. 2. Install a user certificate for each user. For more information, see 6. When the user attempts a VPN connection, the user certificate is sent during the connection negotiation process. To configure EAP-TLS for user certificates on the VPN client:

Figure 29-9 In sandwich integration, you integrate top-level and widely used bottom-level classes first, and save middle-level classes for last.

In this exercise, you install a DNS server on Computer2 and then configure the new DNS server to host a secondary zone.