Which of the following is a likely result of a loss of a tandem switch?

The loss of a tandem switch typically leads to the disruption of call routing and Automatic Number Identification (ANI) services, making the identified answer a likely result. This is because tandem switches play a critical role in connecting calls between different local exchanges and managing the routing of calls through various networks. When a tandem switch fails, it cannot properly route calls, which can lead to dropped connections or the inability to complete calls altogether.

Moreover, the Automatic Number Identification service relies on the tandem switch to trace the caller’s number. A malfunction of this system can halt all identification processes, which are essential for both emergency services and regular call operations. In this context, options that suggest recovery or efficiency improvements do not align with the operational impact of losing a tandem switch. Instead, the loss directly disrupts services, highlighting the importance of these systems in maintaining seamless communication.