Q1. Which of the following Firewall technologies is considered most secure and flexible?
A. Packet Filters
B. Stateful Inspection
C. Application Layer Gateways
D. Authentication Servers
Correct Answer: B
Explanation:
A firewall implemented with stateful inspection technology has several advantages over packet filter. As seen below, stateful inspection technology makes use of all communication information, communication derived state, application derived state, and also able to manipulate information.
| Packet Filters | Application Layer Gateway | Stateful Inspection | |
| Communication Information | Partial usage | Partial usage | Yes |
| Communication Derived State | No | Partial usage | Yes |
| Application Derived State | No | Yes | Yes |
| Information Manipulation | No | Yes | Yes |
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