Q$6.$ All of us know by now that performance is inversely related to delay. When you use the Internet, which of the following applications are more sensitive to delay? Write your answer and provide your own logic. $[6]$

a$.$ Facebook Live

b$.$ Transferring a File

c$.$ Online Banking

Q$7.$ Imagine, in a network, PC$1$ and PC$2$ are connected to a switch, and the switch is then connected to router R$1.$ Router R$1$ is then connected with router R$2.$ Router R$2$ is connected to another PC$-$ PC$3.$ Which device is the first hop, if PC$1$ is the source? Which device is the second hop, if PC$3$ is the source and PC$2$ is the destination? Draw the physical topology. $[3]$

Q$8.$ In the diagram below, R$1,$ R$2$ and R$3$ are three routers. How many different networks do you think the topology has and why? If PC$6$ wants to send data to PC$1$ then what is the $2^{nd}$ hop that the data has to go from the source PC$6?[4]$

Q$9.$ Match the following to one or more layers of the OSI protocol suite: $[5]$

a$.$ Route determination

b$.$ Providing independence from differences in data representation

c$.$ Log$-$in and log$-$out procedures

d$.$ Creating user datagrams

e$.$ Responsibility for handling frames between adjacent nodes

Q$10.$ What are the differences between the error control mechanism in the Transport layer and the Data Link layer? Suppose a computer sends a packet at the network layer to another computer somewhere in the Internet. The logical destination address of the packet is corrupted. What happens to the packet? $[4]$