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Service information filters restrict the advertisement or acceptance of specified services by filtering out information in the data packets that advertise the services destined for particular parts of the network. These filters increase security by limiting the visibility of selected services. However, service information filters provide a lower level of network security than packet forwarding filters because they only monitor service information packets. They also reduce the network traffic caused by periodic service information messages sent by routers.
Service information filters are available for IPX (as outgoing and incoming SAP filters) and AppleTalk (as device hiding filters).
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