During a network migration test, it is crucial not only to verify that the network itself is functioning correctly but also to ensure thatupper-layer application servicesare running properly on the newly migrated network. Migration testing aims to confirm that the transition has not disrupted service functionality.
Option A and C focus solely on network performance, which is necessary but insufficient.
Option B refers to command outputs, which are technical checks and do not guarantee service continuity.
Option D correctly identifies that successful migration is indicated byproper operation of upper-layer application services, as the primary purpose of a network is to support these applications.
[Reference:, Huawei HCIE Datacom Official Certification Guide, Huawei Network Migration Best Practices, ===========, ]
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