What is one of the purposes of a default Multicast Distribution Tree?

Refer to the exhibit. IS-IS is the IGP for the network, where routers R1, R2, R3, and R4 are Level
1 routers in Area 12 and routers R5 and R6 are Level 2 routers in area 16. According to the network design, router R1 must send traffic to R6 using R4 as its next hop. To meet the requirement, a network engineer configured route filtering on R2 to prevent the route to R6 from being advertised from R2. However, R1 is still using R2 as the next hop. Which action must the engineer take to resolve the issue?

Refer to the exhibit. Router 1 is connected to router 2 on interface TenGigE0/1. Which interface provides the alternate path to 172.16.200.9/32 when the link between router 1 and router 2 goes down?

Refer to the exhibit.

A network operator is troubleshooting TE tunnels and discovers that the soft preemption is not working as desired. Where should the soft preemption be applied to solve the issue?

Refer to the exhibit. An MPLS core network has connectivity issues R4 has failed. It impacts traffic loss between R1 and R8. Customers report no access to their file servers, which delays their transformation work. Which quick action resolves the issue until R4 recovers?