Each question is a judgment question. Write down your answer with T for True, F for False, and give theexplanation if the answer is False.a. Consider a system of bandwidth 10Mbps, with multiple users, each is active (i.e., have data to transmitat rate 1Mbps) with a low probability, e.g. 0.1. From the capacity perspective, packet switching isbetter than circuit switching because the former can support more users.b. Denial of Service (DoS) attack can be generated by a large number of (legitimate) TCP connectionrequests to the same targeted server at the same time. These TCP requests can be originated fromdifferent hosts in a botnet, which is controlled by the attacker.c. In VSAT systems the micro-stations do not have sufficient power to communicate directly with oneanother; hence, they use a ground station called a hub with a high gain antenna to relay traffic.d. In the current Internet, communication across the Atlantic Ocean between the USA and Europe ismostly done by wireless communication using satellites.e. Coaxial cable provides larger bandwidth than the twisted pair cable, and fiber provides largerbandwidth than the coaxial cable.
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.
a. 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.
b. 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.
c. 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.
d. In the current Internet, communication across the Atlantic Ocean between the USA and Europe is
mostly done by wireless communication using satellites.
e. Coaxial cable provides larger bandwidth than the twisted pair cable, and fiber provides larger
bandwidth than the coaxial cable.
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