When it is detected that the CPU of the OLT main control board continues to rise, the following possible reasons are: (Multiple Choice)

• A.Rogue ONU
• B.User illegally logged in
• C.Network loop
• D.Cyber attacks

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The network management U2000 adds a line template to realize the mapping of user service flow to GEM PORT. The mapping mode includes: (Multiple Choice)

• A.802.IP
• B.MAC
• C.VLAN
• D.PORT

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In the Type B protection mode, when all the ONU under the PON port are offline, which of the following options is correct?

• A.After the work port is automatically switched to the protect port, the work port is switched back to a stable state.
• B.The work port will not change and in a stable state
• C.The device will continue to perform cyclic detection of the work port and the protect port until an ONU goes online.
• D.After the work port is automatically switched to the protect port, it is in a stable state

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The DBA scheduling of the GP ON system is only for uplink traffic and cannot be scheduled for downlink traffic.

• A.Ture
• B.False

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What are the possible reasons for the phenomenon of blurred screen when watching IPTV programs? (Multiple choice)

• A.There is a speed limit on the device
• B.Some key frames are lost when the program is compressed
• C.Some key frames are lost during line transmission
• D.The transmit and receive luminous power of the equipment is at a critical value

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