On the network shown in the following figure, all interface run OSPFv3. How many DRs exist on the network?

Huawei AR G3 series routers can update system files through FTP and TFTP. The following description is correct () (multiple choice)

if the maximum number in the ACL rule is 12, by default, when the user configures a new rule without specifying a number, what is the number assigned In the new rule by the system?

All interface on a router running OSPF must belong to the same area

Which field of the IPv6 header can be used for QoS?