Each question is a judgment question. Write down your answer with T for True, F for False, and give the explanation if the answer is False. Consider a system of bandwidth 10Mbps, with multiple users,...

Each question is a judgment question. Write down your answer with T for True, F for False, and give the explanation if the answer is False.

• Consider a system of bandwidth 10Mbps, with multiple users, each is active (i.e., have data to transmit at rate 1Mbps) with a low probability, e.g. 0.1. From the capacity perspective, packet switching is better than circuit switching because the former can support more users.


• Denial of Service (DoS) attack can be generated by a large number of (legitimate) TCP connection requests to the same targeted server at the same time. These TCP requests can be originated from different hosts in a botnet, which is controlled by the attacker.


• In VSAT systems the micro-stations do not have sufficient power to communicate directly with one another; hence, they use a ground station called a hub with a high gain antenna to relay traffic.


• In the current Internet, communication across the Atlantic Ocean between the USA and Europe is mostly done by wireless communication using satellites.


• Coaxial cable provides larger bandwidth than the twisted pair cable, and fiber provides larger bandwidth than the coaxial cable.