Which routes will be learned R2 as shown in the figure below?

Which of the following statements regarding IS-IS LSP fragment extension is true?
The router acts as the HW1 MPLS LSR HW, and the router exists in the network of the carrier. The router receives a message with the tag.
The item does not exist in its LFIB ? Then how does the router manage the text?
In order to reduce the number of OSPF, OSPF, and OSPF routes in some stub areas, a special area function protocol is opened. The following describes the characteristics of the special area correctly.
Is it?
The following is about RADIUS? Which is the correct way?
About the prevention mechanism BGP, ? ring The following description is correct
Level-1-2 IS Level-1 Level-2 LSP will be transmitted to the area. If the location is in the range, it indicates the Level-2 LSP ATT 1 Level-1 in the area.
Can pass this Level-1-2 IS to the external area
Each DD packet has a DD sequence number for packet acknowledgment. A DD sequence number is two-bytes long.