a. Describe the two mean network architectures (2 marks) b. List two advantages and disadvantage of each architecture. (4 marks) c. You currently use the default mask for your IP network 192.168.1.0. You need to subnet your network so that you have 30 additional networks, and 4 hosts per network. Is this possible, and what subnet mask should you use? (3 marks) d. Describe the three main models for troubleshooting (3 marks) e. Explain two security features to integrate when designing a network