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The subkeys in HKLM\SYSTEM are ControlSetN, where N is a number beginning with 001. These are control sets, and they describe the computer's configuration. Of all the configuration data stored in the registry, this is by far the most important. Windows XP maintains at least two control sets to make sure that the operating system can always start. If the first fails, you can start with the second by choosing Last Known Good Configuration from the boot options menu. The subkey CurrentControlSet is a link to the current control set ControlSetN. Windows XP identifies the current control set using the key HKLM\SYSTEM\Select. The REG_DWORD value Current contains the number of the current control set. The REG_DWORD value LastKnownGood contains the number of the last control set that worked properly. This is the control set that Windows XP loads when users choose Last Known Good Configuration.

You can use the $PARTITION function to determine the number of a partition that contains a specific value or to restrict a query to a particular partition. To manage partitioning, SQL Server provides the following operators: SPLIT, to introduce a new boundary point into a partition function; MERGE, to remove a boundary point from a partition function, and SWITCH, to scalably add a set of rows to a table or remove a set of rows from a table.

ALTER DATABASE AdventureWorks SET RECOVERY FULL; SELECT DATABASEPROPERTYEX('AdventureWorks', 'Recovery');

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Application Accessible . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589

strong password A password that provides an effective defense against unautho rized access to a resource A strong password is at least seven characters long, does not contain all or part of the user s account name, and contains at least three of the four following categories of characters: uppercase characters, lowercase characters, base 10 digits, and symbols found on the keyboard (such as !, @, #) stub zone A copy of a zone that contains only the resource records required to iden tify the authoritative DNS servers for that zone A DNS server that hosts a parent zone and a stub zone for one of the parent zone s delegated child zones can receive updates from the authoritative DNS servers for the child zone subdomain A DNS domain located directly beneath another domain name (the par ent domain) in the namespace tree For example, examplemicrosoft.

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com would be a subdomain of the domain microsoftcom Also called child domain subnet A subdivision of an IP network Each subnet has its own unique subnetted network ID superscope An administrative grouping feature that supports a DHCP server s ability to use more than one scope for each physical interface and subnet Superscopes are useful under the following conditions: if more DHCP clients must be added to a network than were originally planned, if an IP network is renumbered, or if two or more DHCP servers are configured to provide scope redundancy and fault-tol erant design DHCP service for a single subnet Each superscope can contain one or more member scopes (also known as child scopes) switching hub A central network device (multiport hub) that forwards packets to specific ports rather than, as in conventional hubs, broadcasting every packet to every port.

You can use the following questions to test your knowledge of the information in Lesson 2, Configuring Client Connectivity. The questions are also available on the companion CD if you prefer to review them in electronic form.

MMCs are the containers for snap-ins. Snap-ins can be used in either local or remote context but cannot be connected to both the local and remote computers simultaneously. Snap-ins can be combined in a single console to suit administrative preference. MMCs can be saved in User mode to restrict their configuration, but the ability to perform tasks with the tool is governed by permissions, not by limitations placed on a particular MMC. If a user has sufficient privilege to administer a computer, the user can create MMCs with any snap-in. Remote Desktop For Administration requires permissions to attach with the Remote Desktop client. By default, this permission is granted only to Administrators. Remote Assistance is a two-way, agreed session. At no time can an expert take unauthorized control of a user s computer. Port 3389, the same port used by Remote Desktop For Administration, must be open at the firewall for Remote Assistance sessions to be established.