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would have kept the synonym around for future use). Lastly, a new synonym was created with the previous name, referencing a new data source. This means the original query against dbo.PerfInfo will now access a different SQL Server instance. Synonyms can give you the ability to change underlying data sources without changing the referencing synonym name.

Speaking of mail servers, it s time we took a peek at MX records. These tend to cause a fair bit of confusion among new DNS administrators because their need isn t always obvious. First, you need to understand that MX records are completely separate from either A or CNAME records. MX records are used to tell clients which hosts they should contact in order to deliver e-mail. Some people create an A record for mail and expect it to work. Others create an MX record (which ultimately doesn t point to anything) and expect the same. So, without further ado, let s look at an example (we ve used the expanded version for clarity):

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Microsoft developed a proprietary NTLM authentication scheme, which is based on its NT LAN Manager authentication protocol, to let clients access Internet Information Server (IIS) resources via their Windows credentials. This authentication scheme is often used in corporate environments where single sign-on to intranet sites is desired. The WWW-Authenticate header specifies NTLM as the token; there is no realm="quoted string" attribute pair. Unlike the previous two schemes, which are request-oriented, NTLM is connection-oriented. In the 1980s, MIT developed Kerberos for authenticating users on large, distributed networks. This protocol is more flexible and efficient than NTLM. Furthermore, Kerberos is also considered to be more secure. Some of Kerberos s benefits over NTLM are more efficient authentication to servers, mutual authentication, and delegation of credentials to remote machines.

SQL Server provides a different method for executing distributed queries other than using the fourpart naming method. OPENQUERY is a function that issues a pass-through query against an existing linked server and is referenced in the FROM clause of a query just like a table. The syntax is as follows: OPENQUERY ( linked_server ,'query' ) The parameters for this command are described in Table 27-9. Table 27-9. OPENQUERY Arguments

Various security services have been developed to secure networked applications. These services include multiple versions of Kerberos, NTLM, and SESAME (an extension of Kerberos). Because it is difficult to rework an application to remove its dependence on some security service and place its dependence on another security service, the Generic Security Services Application Program Interface (GSS-API) was developed to provide a standard API for simplifying access to these services. A security service vendor typically provides an implementation of GSS-API as a set of libraries that are installed with the vendor s security software. Underlying a GSS-API implementation sits the actual Kerberos, NTLM, or other mechanism for providing credentials.

The linked server name that you want to query. The actual query to issue against the linked server connection.

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