A packet-filtering router filters data by passing or blocking packets based on source and destination addresses, ports, and protocols. This process is handled by a packet filter that examines the header of each packet according to a specific set of rules. The filter then decides whether to allow or block the packet from passing through the network interface.

1. Question No. 2 Describe how the Packet-Filtering Router filter data. [1 mark]
Solution
The process of passing or blocking packets on the internet at network interface. The passing or
blocking is done on source and destination address, ports, protocols. The Packet filtering is done
by a packet filter, which examines the header of each packet depending on specific set of rules
and then decides whether to prevent from passing it or allowing.