MCSE Bootcamp

WMI Filters

Updated: April 07, 2003

WMI Filters are a new feature in Windows Server 2003 and Windows XP. WMI Filters allow an administrator to dynamically determine the scope of GPOs based on attributes of the target computer. This provides the administrator with the potential to dramatically extend the filtering capabilities for GPOs well beyond the previously available security filtering mechanism.

A WMI filter is a separate object that can be linked to a GPO. When the GPO is applied on the target computer, the filter is evaluated on the target computer. A WMI filter consists of one or more queries that are evaluated against the WMI repository of the target computer. If the total set of queries evaluates to false, the GPO is not applied. If all queries evaluate to true, the GPO is applied. Each query is written using the WMI Query Language (WQL), which is a SQL-like language for querying the WMI repository.

Note that client support for WMI filters exists only on Windows XP and later operating systems. Windows 2000 clients will ignore any WMI filter and the GPO is always applied, regardless of the WMI filter.

Each GPO can have only one WMI filter. However, the same WMI filter can be linked to multiple GPOs. Like GPOs, WMI filters are per domain objects.

Figure 7 in the Scoping GPOs section shows a GPO scope pane with a link to the GPO for the “XP Systems” WMI filter. WMI filters are only available in domains that have the Windows Server 2003 configuration. Although none of the domain controllers need to be running Windows Server 2003, you must have run ADPrep /DomainPrep in this domain. ADPrep is a utility included on the Windows Server 2003 CD and must be run before upgrading an existing Windows 2000 domain to Windows Server 2003. If ADPrep /DomainPrep has not been run in a Windows 2000 domain, the WMI Filters node will not be present, and the GPO scope tab will not have a WMI filters section.

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CCNP : Notes...

14. IGRP, EIGRP: IGRP and EIGRP are proprietary of Cisco. These two protocols use composite metric to determine the best path to a remote network.

-          IGRP (as well as EIGRP) use the following components as metrics:

1.      Delay: Calculated by adding up the delay along the path to the next router.

2.      Reliability: This is representative of how many errors are occurring on the interface. The best reliability value is 255. A value of 128 represents only 50% reliability.

3.      Load: Load metric also has a range from 1 to 255. If a serial link is being operated at 50% capacity, the load value is 255X0.5 or 12.5. Lower load value is better.

4.      MTU: Stands for Maximum Transmit Unit size, in bytes. Ethernet and serial interface has a default MTU of 1500. Larger MTU size means that the link is more efficient.

5.      Bandwidth: The bandwidth is specified in Kbps. Larger the bandwidth, better the link.

EIGRP (as well as IGRP) uses Bandwidth and Delay as default criteria to determine the best path.

-          show ip route eigrp: Displays the current EIGRP entries in the routing table.

-          Show ip eigrp traffic: This command can be used to learn the number of EIGRP packets sent and received.

-          The neighbor table in EIGRP include the following fields:

1.     Neighbor address: This is the network layer address of the neighbor router.

2.     Queue: This represents the number of packets waiting in queue to be sent.

3.     Smooth Round Trip Time (SRTT): This represents the average time it takes to send and receive packets from a neighbor. This timer is used to determine the retransmit interval (RTO).

4.     Hold Time: This is the period of time that a router will wait for a response from a neighbor. If there is no response at the end of this time period, the link is considered unavailable.