By M J I - Maldives
Task 1
a) In context of firewalls, explain the operation of a packet filtering router and an application gateway (sometimes referred as an application proxy)
What does firewall means? As far as my knowledge goes, firewall is some kind of system or group of systems which enables to control access and sets privileges between two networks. The most common boundary in firewall is between a trusted and an un-trusted network. A perfect and secure firewall would not interfere with users’ activities or any transfers between authorized networks. Network firewalls mainly operate in different layers of the OSI model. The lowest layer in which the firewall operates is in the network layer. In this layer the internet protocol for TCP/IP will determine if the packet is from a trusted source. Special privileges cannot be assigned to grant access or deny in this layer. Firewall which works at the highest layer of OSI layer is on Application layer, where granting access is......
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