What is a firewall? Briefly explain the placement of a firewall between a trusted and untrusted network. Firewall is Service / a trusted and an Firewall is placed between unfruited network [5 marks] Filter packe Briefly explain the following rules and their importance in relation to firewalls. to the untru to the t i. Stealth rule: (d) ii. Clean-up rule. [2.5 marks] [2.5 marks]