List and discuss three ways in which firewalls ensure network security.

a. Explain each of the following types of so-called malicious software: backdoors, logic bombs, trojan
horses, zombies and worms. (10 Marks)
b. Describe five different types of viruses. (5 Marks)
c. List and discuss three ways in which firewalls ensure network security. (5 Marks)

 

 

 

 

 

 

 

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