computer network

1. Despite the fact we know that TCP has congestion-control mechanism, what are other reasons that most companies and institutions use TCP not UDP for video conference calls or for live streaming? (Note: your answer must be related to the question. Copying any unnecessary information from the Internet will result in a zero-point grade for this question.) 2. If you are a network administrator in a small company. You are asked to manage network connections (both wired and wireless networks) for all computers that are properties of the company. You must restrict any employee's personal computing devices from using the company's network. For example, employee A has a laptop of his own, but this laptop is not allowed to connect to the Internet through the company's network even though he is physically able to plug the cable into the company's switch. Another example is, even though employee B knows the password of your company's Wi-Fi, she is technically unable to access the Internet using her own cell phone. What should you do to control the company's network? Show the technical details of the control mechanism.