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1. (40%) Provide concise and straight answers to the following questions.
a. What are the key elements of telegraph network architecture?
b. Why is statistical multiplexing used in data networks?
c. What are the benefits of the layered architecture?
d. What is the purpose of network layer?
e. What are the fundamental differences between connection-oriented and
connectionless services?
f. What are the two general approaches to send information faster?
g. What are the benefits of digital transmission?
h. What are the factors to be considered for selecting a line coding scheme?
i. What are the main characteristics of QAM?
j. Why does link layer typically use polynomial coding for error detection?
2. (20%) The Internet below consists of three LANs interconnected by two routers.
Assume that the hosts and routers have the IP addresses as shown.