WhenistheBAClassifierengagedforidentifyingtheforwardingclassoftrafficinaJuniperrouter?（）
A. afterapacketisidentifiedbyamultifieldclassifier
B. afterthetrafficpassesthoughashaper
C. priortoingresspolicingoftraffic
D. whilethepacketisstoredintheswitchingfabricoftherouter
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WhichtwostatementsaretrueaboutTCPcommunication?（）
A. Thereceiveracknowledgesthefinalpacketineachcommunicationsstream.
B. Thereceiveraddssequencingnumberstothepacketsreceived.
C. Thesenderaddssequencingnumberstothepacketsitsends.
D. Thereceiveracknowledgeseachpacketitreceivesfromthesendingdevice.
双方当事人互负债务时，一方通知对方以其债权充当债务的清偿或者双方协商以债权充当债务的清偿，以使双方债务在对等数额内消灭的行为是（）。
A. 清偿
B. 提存
C. 抵销
D. 免除
Whichofthefollowingerrorsarecausedbyleavingafloppydiskinthedrivewhenacomputerispoweredon?（）
A. Randombluescreenerror
B. Inaccessiblebootdrive
C. MissingNTLDR
D. Invalidbootdisk
希望他人向自己发出要约的意思表示是（）
A. 要约邀请
B. 要约
C. 承诺
D. 意思表示
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