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Application Links (cont.)
Perimeter Defense (cont.)
- Firewalling - There are three major types of firewalls:
- Packet Filtering - This type takes traffic and accepts or denies it based on the address and port of the source and destination machines. Packets never traverse the firewall between the "inside" and "outside" networks.
- Stateful Inspection - Each packet is inspected and more information can be flagged e.g. Type Of Service (TOS).
- Application Proxying - Similar to packet filtering, but on an application level. Each app talks directly to a proxy or wrapper that filters the information based on rules.
Notes: