Which of the following phenomena may occur when a layer 2 loop appears in the network?
(Multiple choice)

Use the "display current-configuration | include0.2.*" command on the router to see all the information including "10.0.2" in the current configuration.

In a BGP/MPLS IP VPN network, routing between CE and PE devices can only be established through IGP or BGP protocol.

On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is
49.0001.
IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2 and R5. In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are RR (Route Reflectors), and R1, R4, R3, and R6 are the iBGP peer relationship clients. The iBGP peer relationship ID is 10.0.0.X/32, where X is the number of the iBGP router. R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command.
Which of the following statements are true?

MPLS supports nesting of multiple labels. After receiving an MPLS packet, a device first processes the label next to the Layer 2 header, that is, the top MPLS label.