Discuss why packet switched networks are used for data communication instead of circuit switched [3 marks]. Question 2 (Show your working and give a short explanation for each answer.) An ISP is granted a block of addresses starting with 150.80.0.0/16. The ISP needs to distribute these blocks to 2600 customers as follows:[10 marks] a. The first group has 200 medium-size businesses; each needs approximately 128 addresses. b. The second group has 400small-size businesses; each needs approximately 16 addresses. c. The third group has 2000 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 TCP opens a connection using an initial sequence number (ISN) of 14,534. The other party opens the connection with an ISN of 21,732.[10 marks] a. Show the three TCP segments during the connection establishment. b. Show the contents of the segments during the data transmission if the initiator sends a segment containing the message " Hello dear customer" and the other party answers with a segment containing " Hi there seller". c.Show the contents of the segments during the connection termination Question 5 Compare and contrast DCHP and the ICMP messages that were previously used for startup configuration. What are the advantages of DHCP that caused it to be the popular solution? [ 4 marks]