vb.net generate ean 128 Figure 11-6 The SRV records for SERVER02 in the BRANCHA site in Visual Studio .NET

Printer Code 128 in Visual Studio .NET Figure 11-6 The SRV records for SERVER02 in the BRANCHA site

Figure 11-6 The SRV records for SERVER02 in the BRANCHA site
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The same records are registered in several places in the _msdcs.domainName zone, for example, _msdcs.contoso.com in Figure 11-6. This zone contains records for Microsoft Domain Controller Services. The underscore characters are a requirement of RFC 2052. Locator records contain:
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Service name and port This portion of the SRV record indicates a service with a fixed port. It does not have to be a well-known port. SRV records in Windows Server 2008 include LDAP (port 389), Kerberos (port 88), Kerberos Password protocol (KPASSWD, port 464), and GC services (port 3268).
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Sites and Replication
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Protocol TCP or UDP will be indicated as a transport protocol for the service. The same service can use both protocols, in separate SRV records. Kerberos records, for example, are registered for both TCP and UDP. Microsoft clients use only TCP, but UNIX clients can use TCP. Host name The name corresponds to the A (Host) record for the server hosting the service. When a client queries for a service, the DNS server returns the SRV record and associated A records, so the client does not need to submit a separate query to resolve the IP address of a service.
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The service name in the SRV record follows the standard DNS hierarchy, with components separated by dots. For example, the Kerberos service of a domain controller is registered as:
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kerberos._tcp.siteName._sites.domainName
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Reading this SRV record name right to left like other DNS records, it translates to:
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domainName: the domain or zone, for example, contoso.com _sites: all sites registered with DNS siteName: the site of the domain controller registering the service _tcp: any TCP-based services in the site kerberos: a Kerberos Key Distribution Center (KDC) using TCP as its transport protocol
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Domain Controller Location
Imagine a Windows client has just been joined to the domain. It restarts, receives an IP address from a DHCP server, and is ready to authenticate to the domain. How does the client know where to find a domain controller It does not. Therefore, the client queries the domain for a domain controller by querying the _tcp folder which, you ll remember, contains the SRV records for all domain controllers in the domain. DNS returns a list of all matching DCs, and the client attempts to contact all of them on this, its first startup. The first domain controller that responds to the client examines the client s IP address, cross-references that address with subnet objects, and informs the client of the site to which the client belongs. The client stores the site name in its registry, then queries for domain controllers in the site-specific _tcp folder. DNS returns a list of all DCs in the site. The client attempts to bind with all, and the DC that responds first authenticates the client. The client forms an affinity for this DC and will attempt to authenticate with the same DC in the future. If the DC is unavailable, the client queries the site s _tcp folder again and attempts to bind with all DCs in the site. But what happens if the client is a mobile computer a laptop Imagine that the computer has been authenticating in the BRANCHA site and then the user brings the computer to the BRANCHB site. When the computer starts up, it actually attempts to authenticate with its preferred DC into BRANCHA site. That DC notices the client s IP address is associated with BRANCHB and informs the client of its new site. The client then queries DNS for domain controllers in BRANCHB.
Lesson 1: Configuring Sites and Subnets
You can see how, by storing subnet and site information in Active Directory and by registering services in DNS, a client is encouraged to use services in its site the definition of service localization.
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