1. Explain briefly how RT can be used for Network congestion control 2. CSMA/CD is not commonly used in wired Ethernet networks. Instead, end hosts are typically connected to their nearest Ethernet switch using a full duplex cable. Explain why this kind of network does not require CSMA/CD. 3. each port in a router must have an Ip address assigned to it, while in switches, ports do not need Ip addresses to be assigned to them, explain why? 4. What is the "count to infinity" problem in distance vector routing? and how can this problem be solved using poisoned reverse algorithm. 5. Most wireless access points and devices have the option of encrypting traffic. whys is that necessary? and Which OS layer is that encryption taking place? 6. A host (A) with an Ip address 172.16. 192.25/20 is trying to sent a datagram to another host (B) with an Ip address 172.16.134.25/20. Explain the actions that will be taken by Host A for this task to be completed. (only Host A actions) 7. What is the network address of a host with an ip address : 192.168.100.120/26 "Make sure to show your calculation" 8. Given the following IPv4 Address: 172.16.100.192/26. You Are asked to subnet this Ip address for 2 networks, Network A with 25 hosts and Network B with 5 hosts. what is the lIp address and what is the prefix of each network. "Make sure to show your calculation" 9. For each of the following Packet Scheduling, match the Packet Scheduling term with the right description 10. What is the main limit of IPv4? with this limitation, how is that IPv4 is still operating? IPv6 was designed to fix the limitation of IPv4, how? & why IPv6 is not fully adopted? 11. A middlebox is defined as any intermediary device performing functions other than the normal, standard functions of an IP router on the datagram path between a source host and destination host. Explain how is that possible? and list 2 examples of functions "other than normal, standard functions of an IP router" a middlebox can implement.