正解:C
The issue with the voice traffic from the branch site to the central site is due to traffic load-balancing over both links, causing packets to arrive out of order. In the exhibit, there are two paths for network traffic to travel between R2 and R1 routers. When multiple equal-cost paths exist (ECMP), routers can distribute outbound traffic fairly evenly across these paths. However, this can sometimes lead to packets arriving at their destination out of order, especially in scenarios involving real-time communication like voice or video conferencing.