If the link layer protocol of the OSPF interface is HDLC, the corresponding network type is _____.

In the topology shown in the figure, execute the following commands on RTA:
RTA-ospf-1] default-route-advertise
The default route cannot be observed in the routing table of the RTC router. The possible reason is ______

In the topology shown in the figure, execute the following commands on the RTA router:
RTA-ospf-1] default-route-advertise
RTA] ip route-static 0.0.0.0 0.0.0.0 192.168.0.2
The default route cannot be observed in the routing table of the RTC router. The possible reason is ______

The RIP protocol is enabled on a router, the process number is 1, and the priority is 10; at the same time, the OSPF protocol is enabled, the process number is 100, and the priority is 100. If two processes learn the route of network segment 10.0.0.0/8 at the same time, the metric values ​​are 1 (hop count) and 100 (cost value) respectively, and the next hops are 1.0.0.1 and 1.0.0.2 respectively.
After the router receives the packet with the destination address 10.0.0.1, what should it do?

The routing table on an H3C router is displayed as follows:
H3C]disp ip rout
Routing Table: public net
Destination/Mask Protocol Pre Cost Nexthop Interface
10.0.0.0/8 OSPF 10 2 20.1.1.2 Ethernet0/0
20.1.1.0/30 DIRECT 0 0 20.1.1.1 Ethernet0/0
20.1.1.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0
127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0
127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0
172.16.1.0/24 DIRECT 0 0 172.16.1.1 LoopBack1
172.16.1.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0
192.168.1.0/24 DIRECT 0 0 192.168.1. LoopBack2
192.168.1.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0
At the same time, configure the following commands on the router:
bgp 65400
network 172.16.0.0
network 192.168.1.0
network 10.0.0.0
Based on the above information, which of the following BGP routes should exist in the router's BGP routing table: