Final answer:
Network setup and maintenance can be expensive and require technical expertise, while ease of setup varies depending on the network's complexity. Intruders can disrupt network connectivity. Accurate record-keeping by network staff is essential.
Step-by-step explanation:
The statement regarding whether networks are expensive to set up and maintain is true. Networks can be costly because they require not only physical components such as routers, switches, and cabling, but also software for network management, and continuous maintenance and monitoring.
Whether networks are easy to set up can be subjective. For simple home or small business networks, it may be relatively easy. However, designing and implementing a large-scale enterprise network requires careful planning, technical expertise, and is generally not easy.
The statement that intruders into a network cannot disrupt network connectivity for users is false. Intruders can cause significant disruptions, potentially leading to a denial-of-service attack which could disable network resources.
It is true that network staff need to keep accurate records on what has been done to a network. Good record-keeping is essential for troubleshooting, auditing, and understanding the evolution of the network over time.