Regarding the first type of external routing and the second type of external routing in OSPF, the correct statement is ________

Perform the following configurations on RTA, RTB, and RTC in the topology shown in the figure:
RTA-GigabitEthernet0/0] ip address 192.168.2.1 255.255.255.0
RTA] ospf 1 router-id 1.1.1.1
RTA-ospf-1] area 1
RTA-ospf-1-area-0.0.0.1] network 192.168.2.0 0.0.0.255
RTB-GigabitEthernet0/0] ip address 192.168.2.2 255.255.255.0
RTB-GigabitEthernet0/1] ip address 192.168.3.1 255.255.255.0
RTB] ospf 1 router-id 2.2.2.2
RTB-ospf-1] area 1
RTB-ospf-1-area-0.0.0.1] network 192.168.2.0 0.0.0.255
RTB-ospf-1] area 0
RTB-ospf-1-area-0.0.0.0] network 192.168.3.0 0.0.0.255
RTB-ospf-1]import-route direct
RTC-GigabitEthernet0/0] ip address 192.168.3.2 255.255.255.0
RTC] ospf 1 router-id 3.3.3.3
RTC-ospf-1] area 0
RTC-ospf-1-area-0.0.0.0] network 192.168.3.0 0.0.0.255
Then the types of LSAs generated by RTB in the OSPF area are _______

RTA and RTB are not directly interconnected and are located in autonomous systems 100 and 200 respectively. The loopback0 address of RTA is 1.1.1.1, and the loopback address of RTB is 0 2.2.2.2.

If an EBGP neighbor relationship is established with loopback0 between RTA and RTB, which of the following configurations is the correct configuration on RTA?

Which of the following levels does the SOA-based network architecture divide the enterprise IT system into? (Choose one or more)

Each OSI network device is networked as shown in the figure. There are ______ ESs in the OSI network. (Host)