OSPF can support multiple network types. Which of the following network types need to elect DR and BDR? (Multiple choice)

When pinging the IP address of a certain interface of the firewall on the firewall, these messages will be handed over to the internal module of the firewall for processing and will not be forwarded.

The following is part of the configuration information of the router Huawei. Which description is wrong about the configuration information?
[HUAWEI] ip as-path-filter 2 permit_200_300
[HUAWEI]route-policy test permit node 10
[HUAWE]-route-policy] if-match as-path-filter 2

In the process of IS-IS, configured filter-policy 2000 export, which of the following statement on the role of the command is wrong?

What message types does OSPF include? (Multiple choice)