| 摘要 |
A local area network which has at least two CSMA collision domains and at least three LAN stations also includes communication security interface devices, each connected to the at least two CSMA collision domains and to at least one LAN station. The interface devices each include a transmitter, a receiver, apparatus for sensing a transmitted packet having a destination address followed by data, which is transmitted along a given CSMA collision domain, apparatus for comparing the transmitted packet destination address with the local address of the at least one LAN station and apparatus for ensuring that the receiver does not receive data contained in the transmitted packet whose destination address does not match the local address of said at least one LAN station.
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