What challenge is associated with the installation of telephone networks?

The challenge associated with the installation of telephone networks primarily revolves around the difficult lay down of ground cables. This task can be complex due to various factors such as the need to navigate through different types of terrains, ensuring that the cables are properly insulated and protected from environmental elements, and adhering to regulations regarding underground installations. Moreover, the installation often requires extensive labor, excavation, and the utilization of specialized equipment to deploy cables accurately. Proper planning and execution are vital to avoid disruptions and ensure the network's reliability.

In contrast, the other choices do not represent significant challenges when it comes to telephone network installation. For instance, effective management of updates and control systems for networks is a designed aspect of their infrastructure. Security can be implemented effectively through various protocols, so it isn't inherently a challenge of installation. Additionally, telephone networks typically do require a power connection, particularly for central offices and associated equipment, making the idea of no need for power connection an inaccurate statement regarding installation challenges.