There is an existing router HW1 running OSPF. The interface Sera0 of HW1 is released in area 0, and the interface Sera1 is released in area 1. Run the "nssa default-route-advertise" command in the OSPF process.
Based on the previous description, which of the following options are inferred to be correct? (Multiple choice)

• A.When HW1 injects the default route into Area 1, the local routing table of HW1 needs to have a default route.
• B.When HW1 injects the default route into Area 1, the local routing table of HW1 may not contain a default route.
• C.HW1 will inject zone 3 default routes into zone 1.
• D.HW1 will inject zone 7 default route into zone 1.
• E.HW1 will inject zone 7 default route into zone 0

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Four routers R1, R2, R3, and R4 run ISIS, the ISIS router type is marked, and the routing table is viewed on R1. The reason why R1 does not reach the route of 10.34.34.4 is

• A.Configure a routing policy on R2 to filter the default route.
• B.R2's system-ID conflicts with R3
• C.Regional planning errors for R3 and R4
• D.R2's system-ID conflicts with R1

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Which of the following is the correct description of the route priority for ISIS?

• A.The routing priority of ISIS cannot be modified.
• B.ISIS aggregated route has a priority of 10
• C.The default route of ISIS priority is 15.
• D.The LeveI-1 and Leve-2 routes in the ISIS database have different routing priorities.

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Network administrators can use CAR technology in traffic policing. Which of the following technologies can be applied in CAR? (Multiple Choice)

• A.Double barrel double speed
• B.Three barrels single speed
• C.Double barrel single speed
• D.Single barrel single speed

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In Rapid Spanning Tree Protocol (RSTP), which port provides a backup path to the root bridge and which state should this port be in?

• A.Designated port/learning
• B.Alternate port/learning
• C.Root port/listening
• D.Alternate port/discarding
• E.Alternate port/forwarding

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