多项选择题

WhichfourstatementsaboutanIPservicelevelagreement（SLA）a……

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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单项选择题WhichOSPFLSAisusedtosupportMPLStrafficengineering？（）

A.opaque LSA （Type 8）
B.opaque LSA （Type 9）
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D.network LSA （Type 2）
E.opaque LSA （Type 10）

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C.Russian Doll Model
D.Global Tunnel Model
E.Policy-based Model