CST 311 - Week 8
This week, the final week, the topic of study was security. This includes firewalls as well as intrusion detection systems (IDS)/intrusion protection systems (IPS). Firewalls accomplish two major things. Those are separating the inside net traffic from the outside net traffic and filter traffic. It filters the traffic by comparing the packet against a security protocol, set up locally by the network admin, and deciding whether to block or allow the packet through. The purpose of using a firewall is to prevent DoS attacks, prevent illegal modifying or accessing of internal data, allow authorized access to the outside net, etc. There are three types of firewalls, stateless packet filters, stateful packet filters, and application gateways. Stateless packet filtering filters packet-by-packet deciding whether to forward it on to the destination or drop the packet based on many criteria. These include the source/destination IP address, TCP/UDP source/...