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A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）
- A、session
- B、network
- C、physical
- D、data link
- E、transport
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单选题A receiving host computes the checksum on a frame and determines that the frame is damaged.Theframe is then discarded.At which OSI layer did this happen?（）A
sessionB
networkC
physicalD
datalinkE
transport
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单选题A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）A
sessionB
networkC
PhysicalD
data linkE
Transport
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单选题What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations？（）A
immediately after receiving the first packet on the shared tree for a given （S，G）B
after receiving over 1 kb/s traffic onthe shared tree for a given （S，G）C
10 seconds after receiving the first packet on the shared tree for a given （S，G）D
30 seconds after receiving the first packet on the shared tree for a given （S，G）E
after receiving over 10 kb/s traffic onthe shared tree for a given （S，G）
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1B
2C
3D
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