Which of the following parameters is not contained in STP configuration BPDUs?

When adopting LACP mode for link aggregation, what is the default system interference level of Huawei switches? ()

There are hosts in a private network that need to access 1nternet. In order to achieve this requirement, which of the following configurations should be done by the administrator on the edge router of the network? ()*

Which state does the 0SPF protocol use to indicate that the adjacency relationship has been established? ()

The network shown in the figure below assumes that all routers can enable OSPF at the same time. Which router is the DR in this network? () (Single-choice question)