a. Describe the three hierarchical approach in designing Wide Area Networks (WAN)[6marks] b. Describe the network troubleshooting process [5marks] c. Explain with examples TCP/IP utilities role in network troubleshooting [5 marks] d. You have subnetted the 172.30.10.0 network with a mask of 255.255.255.192. How many usable subnets will you have and how many hosts are available on each subnet? [4marks] Question 4 a. Outline three topologies in Wide Area Networks (WAN) \{3marks] b. Explain two of the topology types stated in (a) [6marks] c. Explain the benefits of syslog messages in network management [5marks] d. Explain any three of the functional areas of network management system [ 6 marks]