As shown in the following figure, what routes can R2 learn?

• A.R2 can learn the LSPs of R1 but cannot add them to the routing table.
• B.R2 can learn all the routes of R1.
• C.R2 can learn routes 10.1.2.0/24 and 10.1.3.0/24.
• D.R2 can learn the route 10.1.1.0/24.

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Which of the following command is displayed to determine that the loop fault of the switch is generated?
A:

B:

C:

D:

• A.Option D
• B.Option A
• C.Option C
• D.Option B

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Combined with the output result in the following figure, which statements are correct? (Multiple Choice)

• A.R3 must be a DIS of a level-1 link
• B.R3 must be a DIS of a level-2 link
• C.R3 router is level-2 router
• D.The system ID of the R3 router is 0003.0000.0000

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As shown in the figure, in the IPv4 and IPv6 environment, the SEL field in the ISIS NET address always takes the value 00.

• A.False
• B.True

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In RSTP, which port can provide the backup path to reach the root node of the spanning tree? What status is the port in?

• A.Alternate port and Learning status
• B.Alternate port and Discarding status
• C.Designated port and Listening status
• D.Root port and Listening status
• E.Alternate port and Forwarding status

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