Describe the differences between a repeater, a switch and a router. Why is a router generally more expensive and complex than a switch, and why is a switch generally more complex and expensive than a repeater? [5 marks]. Question 2 (Show your working and give a short explanation for each answer.) Designing IP Addressing schemes and configuring IP Addressing is a common activity undertaken by network engineers. Consider an ISP is granted a block of addresses starting with 125.80.0.0/16. The ISP needs to distribute these blocks to 2500 customers as follows:[7 marks] a. The first group has 180 medium-size businesses; each needs approximately 128 addresses. b. The second group has 500 small-size businesses; each needs approximately 16 addresses. c. The third group has 1800 households; each needs 4 addresses Design the sub blocks and give the slash notation for each sub block. Find out how many addresses are still available after these allocations. Question 3 Consider the diagram below. Which of the two central routers (R1 and R2) is more critical for network operations and why? [3 marks] Question 4 Contrast and compare distance vector routing with link state routing.[5 marks] Question 5 Describe Poison ARP and describe how it can be used to compromise a network. What measures can be used to protect a network from Poison ARP? [ 10 marks]