Is the following description correct? When upgrading the version, use the database upgrade tool to upgrade the dat file to the higher version, and you can also use the upgrade tool to reduce the dat file of the higher version to the lower version.

• A.True
• B.False

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Which of the following options can effectively reduce the size of routing table entries?

• A.Increase the update frequency of dynamic routing
• B.Route Aggregation
• C.Deploy BFD to accelerate network monitoring
• D.Divide VLAN

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Where is the H.248 protocol used?

• A.Between MG and Swich
• B.Between MGC and MG
• C.Between MG and MG
• D.Between MGC and MGC

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During optical transmission, retroreflection light will be generated at the connection of optical fibers. In order to reduce the influence of the emitted light on the light source and the system, the absolute value of return loss (reflection loss) is as large as possible.

• A.TRUE
• B.FALSE

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The downlink wavelengths in the 10G GPON system are?

• A.1490nm
• B.1310nm
• C.1270nm
• D.1577nm

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