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<h2 class="first-section-title"><a name="271"></a><a name="ch08lev1sec5"></a>Network Diagram Example</h2><a name="272"></a><a name="IDX-108"></a>
<p class="para">The architecture shown in <a class="internaljump" href="#ch08fig03">figure 8.3</a> is a slight variation from the generic architecture presented in <a href="LiB0057.html#264" target="_parent" class="chapterjump">Figure 8.2</a>. The site has two DMZs for extra security. The outer DMZ hosts Web servers, the LDAP servers (for customer authorization), and a mail server. The inner DMZ hosts all application servers, database servers, and messaging servers. This architecture is redundant and scalable at several levels. As usage of the site expands, the number of Web servers, LDAP servers, application servers, and database servers can easily be expanded to handle growth.</p>
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<span class="figure-title"><span class="figure-titlelabel">Figure 8.3: </span>Network Diagram Example</span>
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<p class="last-para">The fact that all types of servers are duplicated at least once (with the exception of the mail server) significantly lowers the probability of an unplanned outage. The fact that the mail server isn't made redundant means that the company is prepared to accept a limited mail service outage.</p>
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