narks] IF a) [8 marks] An ISP is assigned a class B network of 136.45.0.0. Divide this into four subnets. Assume the first and last subnets are usable. i) [4 marks] List the network addresses for the subnets in dotted-decimal slash notation. i) [2 marks] What is the broadcast addresses for these subnets? ii) [2 marks] Give the subnet mask? b) [3 marks] What is ARP? Briefly describe how ARP works in IPv4. Why does IPv6 not require ARP? c) [3 marks] Routers perform two major functions, routing and forwarding. Describe each of these and the relationship between them d) [3 marks] Packet delivery is unreliable in IP. What four things can happen to packets that make their delivery unreliable? What does IP do when one of these conditions occur? e) [3 marks] IP is an end-to-end protocol. What are the two ends in IP? Why is a transport-layer port needed