多选题Which four statements about an IP service level agreement （SLA） are true？ （）ASLA responder knows type of operation， the port used， and duration.BSLA responder inserts in and out timestamps in the packet payload.CSLA sender and responder use the IP SLA Control Protocol to communicate with each other beforeDSLA sender and responder communication can be encrypted.ESLA sender and responder communication can be authenticated with MD5.
多选题
Which four statements about an IP service level agreement （SLA） are true？ （）
A
SLA responder knows type of operation， the port used， and duration.
B
SLA responder inserts in and out timestamps in the packet payload.
C
SLA sender and responder use the IP SLA Control Protocol to communicate with each other before
D
SLA sender and responder communication can be encrypted.
E
SLA sender and responder communication can be authenticated with MD5.
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