B As shown in the figure, RTA, RTB, and RTC run OSPF, and the process number is 100; OSPF process 200 runs between RTA, RTB, and RTD. The cost of all interconnected links is set to 10. Set the external route priority of OSPF 100 on RTA and RTB to 190, and import an external route 172.16.1.0/24 into OSPF 100 on RTC. Both RTA and RTB are configured to import OSPF100 routes into OSPF200.
According to the above scenario analysis, the following description about RTD learning external routing 172.16.1.0/24 is correct.

• A.There are two equal-cost routes to 172.16.10.0/24 on RTD, and the next hop points to RTA and RTB respectively
• B.There is a route to 172.16.10.0/24 on RTD, and the next hop must point to RTA
• C.There is a route to 172.16.10.0/24 on RTD, and the next hop may point to RTA or RTB
• D.The route of 172.16.10.0/24 cannot be learned on RTD

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A BGP connection is established between the routers RTA and RTB and they have learned routes from each other. Both RTA and RTB use default timers.
If the link between routers is congested and RTA cannot receive the Keepalive message from RTB, which of the following consequences will occur?

• A.After 180 seconds, RTA considers that the neighbor is invalid and deletes the route learned from RTB
• B.After 30 seconds, RTA considers that the neighbor is invalid and deletes the route learned from RTB
• C.After 120 seconds, RTA considers that the neighbor is invalid and deletes the route learned from RTB
• D.After 90 seconds, RTA considers that the neighbor is invalid and deletes the route learned from RTB

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In the IS-IS network as shown in the figure, the adjacency relationship between routers is established normally, and routes can be learned from each other.
Which routers in the picture must be Level-1-2 routers?

• A.RTD
• B.RTC
• C.RTE
• D.RTA
• E.RTB

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Among the following statements about PBR (polic-based-route) load sharing applications, the correct one is ______________.

• A.PBR can realize load sharing on the outgoing interface according to different packet lengths
• B.PBR can implement load sharing on the outbound interface according to the next hop of the route
• C.PBR can implement load sharing on the outgoing interface according to the different bearer services of the data stream
• D.PBR can implement load sharing on the outbound interface according to the source address of the message

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In the IS-IS network as shown in the figure, each router is configured as follows.
RTA-isis-1]cost-ste compatible
RTB-isis-1]cost-ste narrow
RTC-isis-1]cost-ste wide
Then the link cost between each other can be calculated correctly is ________.

• A.Nothing
• B.RTB and RTC
• C.RTA and RTB
• D.RTA and RTC

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