4. Please setup the following network topology in NS3 environment? Your simulation should include the following properties: - Each link must be defined as duplex link; - You have to monitor queue mechanism on the node3, node4 and node7; - Queue position must be perpendicular according to the node3, node4 and node7; - The queue limit for all nodes should be equal to 10. - Your simulation must consist of TCP and UDP package flows. - You have to send raw data over TCP connection