As shown in the figure, R1 and R2 form a VRRP backup group with VRID 12. Now the user starts R1 one minute after R2 starts.

So which of the following descriptions of the default status of R1 are correct? (Multiple choice)

• A.After R1 starts stably, the final Master device is R1
• B.If you change the priority of R1 to 100 and then start it, the final master device will be R2.
• C.After R1 starts stably, the final master device is R2.
• D.If you change the priority of R1 to 100 and then start it, the final master device will be R1.

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Which of the following BGP routing attributes is not a recognized attribute?

• A.MED
• B.Local_Pref
• C.AS_ PATH
• D.Origin

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Whether a non-edge port migrates to the Forvardin state is one of the criteria for RSTP to detect topology changes.

• A.TRUE
• B.FALSE

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NEICONF is a ()-based network configuration protocol. Its purpose is to automate network configuration in a programmable manner, thereby simplifying and accelerating the deployment of network services.

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If a new member joins a multicast group in PIM-DM, which of the following descriptions are correct? (Multiple choice)

• A.You can use the grafting mechanism to proactively establish a multicast distribution path in reverse direction to help new users receive multicast information.
• B.In PIM-DM mode, after using the "diffusion-pruning" method to establish a multicast distribution tree, the status refresh mechanism prevents the downlink interface from automatically recovering once it is suppressed.
• C.The multicast network needs to update the multicast distribution tree before it can send multicast data to group members.
• D.In existing networks, the method of waiting for the multicast routing table to time out and then flooding the entire network again is often used to help new users receive multicast information.

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