c# barcode scanner text box Site-to-Site Replication in Software

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When deciding to split a network into multiple sites, a number of new issues arise These issues, and the configuration needed to make multiple sites work, are the subject of the remainder of this section
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Figure 7-7 Replication traffic between two domains within the same site
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Two main rules should be adhered to whenever planning a multisite design, to minimize the potential problems: Sites always should be split by geographic regions When two or more LANs are connected by WAN links, each LAN should represent its own site Whenever possible, each site should have its own AD and global catalog server In some smaller networks, this server may be the only server in the site, in which case it should also serve as the DNS and DHCP server This will increase fault tolerance as well as client performance, while decreasing WAN bandwidth utilization
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Sites are connected using site links, which are domain controllers configured to serve as a connection to a particular site Site links have to be manually configured using the AD Sites And Services console When creating a site link, the administrator has a number of configuration options
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The first of these configuration options is the replication schedule An administrator can determine when replication should occur across a particular site link When setting the replication schedule, an administrator will set the replication cost, replication availability, and replication frequency associated with the site link When the site link is created and configured, AD automatically creates a connection object, which will use the information provided by the site link to actually transfer the information between the domains By default and design, all site links are transitive, which allows sites to be used in the same manner transitive trusts are used This means that a site can replicate its changes to another site, via a site connector to a third site, as long as the third site has a valid connection to both sites In some organizations in which multiple field offices all connect to central corporate offices, this kind of replication allows for the greatest efficiency All sites replicate their information to the central office site, which in turn replicates the information back out to the other field offices
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Protocols
There are two protocol options within any network for connecting sites together Both options, though, are protocols within the TCP/IP protocol stack There is no way to connect two sites using anything other than IP RPC (IP replication) Remote Procedure Call (RPC) is an IP-based, connection-oriented protocol that is at the base of legacy Exchange installations RPC is fast and reliable when used on connection-friendly networks (networks that allow packets to travel the same path and arrive in sequence at the destination) However, RPC is less than reliable in large mesh networks, such as the Internet RPC communication is still the default replication method for servers within the same site as well as for intra-site communication for other Microsoft services such as Exchange SMTP A feature that was introduced with Windows 2000 and Exchange 2000 is the ability to connect sites using SMTP connectors SMTP cannot be used for replication between servers in the same site (although it is the default for Exchange Server) SMTP is not capable of replicating the domain partition, and therefore it is suitable only for linking two sites that are also separate domains SMTP can pass the schema, configuration, and global catalog partitions very efficiently
NOTE SMTP is, by nature, very insecure All SMTP messages are sent in formats that can be easily interpreted by the most basic of sniffing tools For this reason, using the SMTP protocol to connect two sites requires that an enterprise certification authority be installed and configured on the network This allows for all SMTP traffic generated by AD to be encrypted using at least 56-bit encryption
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