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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.
Suppose that each voice sample should not be delayed by more than 20ms.
a. Discuss which of the following adaptation functions are relevant to meeting the
requirements of this transfer: handling of arbitrary message size; reliability and
sequencing; pacing and flow control; timing; addressing; and privacy, integrity and
authentication.
b. Compare a hop-by-hop approach to an end-to-end approach to meeting the
requirements of the voice signal.
Q.4 (2 marks):
The ability to work with IPv4 subnets and determine network and host information based on a
given IP address and subnet mask is critical to understanding how IPv4 networks operate. The
first part is designed to reinforce how to compute network IP address information from a given
IP address and subnet mask. When given an IP address and subnet mask, you will be able to
determine other information about the subnet.
Fill out the tables below with appropriate answers given the IPv4 address, original subnet mask,
and new subnet mask.
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