Run the command and display information on the router as follows:
<RTA>displaisis brief
ISIS(1) Protocol Brief Information:
network-entit:
01.1111.1111.1111.00
is-level: level-1-2
cost-ste: narrow
preference: 15
Lsp-length receive: 1497
Lsp-length originate: level-1 1476
level-2 1476
maximum imported routes number: 10000
Timers:
lsp-max-age: 1200
lsp-refresh: 900
Interval between SPFs: 10
From the above information, you can know RTA______.

IS-IS sends ________ messages periodically on the broadcast network type link.

In the topology shown in the figure, the following configurations are performed on RTA and RTB respectively:
RTA-ospf-1-area-0.0.0.1]network 192.168.0.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.2.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.3.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.4.0 0.0.0.255
RTB] acl number 2000
RTB-acl-basic-2000] rule 0 permit source 192.168.1.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1] filter 2000 export
Then the routes that cannot exist in the routing table of RTC are _____

When the BGP neighbor state machine is in what state, it indicates that the TCP connection with the neighbor has been established normally?

As shown in the figure, RTA, RTB, and RTC run OSPF routing protocol, and the cost value of each link is shown in the figure. OSPF protocol runs between RTA, RTB and RTC, and neighbors are successfully established. BGP runs between RTA and RTB and IBGP neighbors are successfully established; at the same time, RTA, RTB and RTD establish EBGP neighbors. RTC imports the external route 172.16.1.0/24 into OSPF, the import type is tpe1, and the cost is 200. Configure OSPF routes on RTA and RTB to import BGP without setting any routing policies.
Based on the above scenario analysis, the correct description below is ______.