| 摘要 |
Components of an antivirus program may be updated by multicasting fragments of the update and unicasting missed fragments. The components may include a virus pattern file. The virus pattern file may be divided into several file fragments, with each file fragment being multicast to several client computers. The client computers may receive the file fragments and assemble them into the virus pattern file. The file fragments may be multicast in several rounds. When a client computer misses a file fragment, that client computer may request the missing file fragment from a server computer, which may unicast the missing file fragment to the client computer. An announcement indicating the name of the virus pattern file, the number of file fragments that form the virus pattern file, and the designated server from which to request and receive missed file fragments may be multicast to the client computers prior to the file fragments.
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