Question 2.1: Looking at the topology in Figure 1 and the service agreement
between autonomous systems.
a) Which autonomous carries the volume of traffic from Claranet to GTT?Explain. [2 marks]
b) Is the volume of traffic in a) carries free of charge? Explain.
[2 marks]
Question 2.2: Considering the topology in Figure 1, and the service agreement
between Claranet and RENATER,
a) Which autonomous system invoices the volume of traffic between Claranet and
Renater on their dedicated link?
b) Which autonomous system charges for the volume of traffic from lrisa to
Claranet?
[2 marks]
[2 marks]
Question 2.3: For a communication from Claranet to GTT, what is the path that
respect the agreements between the two autonomous systems?
[2 marks]
Question 2.4: For a communication from IRISA to Interoute, what are the paths
that respect the service agreements between the two autonomous systems?
[4 marks]
Question 2.5: For a communication from Claranet to Interoute, what are the paths [4 marks]
that respect the service agreements between the two autonomous systems?
QUESTION 3 [6 marks]
Suppose every link in the network carries two classes of traffic -telephone calls and e-
mail messages, with a separate queue for each class. When deciding which packet to
send next, the router first selects the head of the queue containing the voice traffic, and
only sends an e-mail packet if the voice queue is empty. Does the e-mail traffic have
any effect on the performance experienced by the telephone calls? If so, what can be
done to minimize the effects?
[6 marks]
QUESTION 4 [ 12 marks]
Suppose that a router has four input flows being serviced according to a Weighted
Fair Queueing (WFQ} scheduling policy. The weights given to the four queues (A,
3