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Q.1 (2 marks):
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Suppose the size of an uncompressed text file is 1 megabyte
a. How long does it take to download the file over a 32 kilobit/second modem?
b. How long does it take to take to download the file over a 1 megabit/second modem?
c. Suppose data compression is applied to the text file. How much do the transmission
times in parts (a) and (b) change?
Q.2 (2 marks):
Suppose HDLC is used over a 1.5 Mbps geostationary satellite link. Suppose that 250-
byte frames are used in the data link control. What is the maximum rate at which
information can be transmitted over the link?
Q.3 (2 marks):
Consider the transfer of a single real-time telephone voice signal across a packet network.
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