Problem

a) Distributed network architecture is whereby services are executed and distributed  among various computers. Give two advantages and two disadvantages of the distributed architecture.

b) With the use of diagram(s), illustrate how the star topology is different to the bus topology.

c) The figure below shows a typical firewall connection. Why the use of a firewall is important.

d) Explain in details the importance of encryption and how encryption and decryption work. Use a diagram to illustrate your answer.