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Host (A) Resource Records Host (A) resource records make up the majority of resource records in a zone database. These records are used in a zone to associate DNS

The code executes a little slower because the CLR is checking these operations to determine whether an overflow occurred If an overflow occurs, the CLR throws an OverflowException In addition to having overflow checking turned on or off globally, programmers can control overflow checking in specific regions of their code C# allows this flexibility by offering checked and unchecked operators Here s an example that uses the unchecked operator:.

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Description Maps to HKEY_CLASSES_ROOT. Contains information about extension to application mappings and OLE objects. Maps to HKEY_CURENT_CONFIG. Contains current non-user-specific CurrentConfig hardware configuration information. Maps to HKEY_CURRENT_USER. Contains information about current CurrentUser user preferences. Maps to HKEY_DYN_DATA. Contains dynamic registry data. DynData Maps to HKEY_LOCAL_MACHINE. Contains local machine LocalMachine configuration data. PerformanceData Maps to HKEY_PERFORMANCE_DATA. Contains performance information. Maps to HKEY_USERS. Contains information about user accounts and Users default user information.

And here is an example that uses the checked operator:

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domain names of computers (or hosts) to their IP addresses. They can be added to a zone in different ways:

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In this example, b and 200 are first converted to 32-bit values and are then added together; the result is 300 . Then 300 is converted to a Byte due to the explicit cast; this generates the OverflowException . If the Byte were cast outside the checked operator, the exception wouldn t occur:

You can manually create an A resource record for a static TCP/IP client computer by using the DNS console or the Dnscmd support tool at the command line. Computers running Windows 2000, Windows XP, or Windows Server 2003 use the DHCP Client service to dynamically register and update their own A resource records in DNS when an IP configuration change occurs. Dynamic Host Configuration Protocol (DHCP) enabled client computers running earlier versions of Microsoft operating systems can have their A resource records registered and updated by proxy if they obtain their IP lease from a qualified DHCP server. (Only the DHCP service provided with Windows Server 2003 cur rently supports this feature.)

The RegistryKey class represents a key node within the Registry hierarchy. Table A-7 details the members of the RegistryKey class that provide access to information about a particular key as well as the values and child keys it contains. All get, set, and delete methods are case preserving but not case sensitive with regard to the registry key and value names.

In addition to the checked and unchecked operators, C# also offers checked and unchecked statements . The statements cause all expressions within a block to be checked or unchecked:

Once created in the DNS console, an A resource record that maps the host name server1.lucernepublishing.com to the IP address 172.16.48.1 is represented textually within the lucernepublishing.com.dns zone file as follows:

checked { Byte b = 100; b = (Byte) (b + 200); } // Start of checked block // This expression is checked for overflow. // End of checked block

If you can ping a computer by IP address but not by name, the computer is miss ing an A resource record in DNS. You can attempt to remedy this situation by executing the Ipconfig /registerdns command at that computer but only if the client computer is running a version of Windows 2000, Windows XP or Windows Server 2003. ,

Member Properties Name SubkeyCount ValueCount Methods Close() CreateSubKey()

In fact, if you use a checked statement block, you can now use the += operator with the Byte, which simplifies the code a bit:

Alias (CNAME) Resource Records Alias (CNAME) resource records are also sometimes called canonical names. These records allow you to use more than one name to point to a single host. For example, the well-known server names (ftp, www) are typically registered using CNAME resource records. These records map the host name specific to a given service (such as ftp.lucernepublishing.com) to the actual A resource record of the computer hosting the service (such as server-boston.lucernepublishing.com). CNAME resource records are also recommended for use in the following scenarios:

When a host specified in an A resource record in the same zone needs to be renamed When a generic name for a well-known server such as www needs to resolve to a group of individual computers (each with individual A resource records) that provide the same service (for example, a group of redundant Web servers)