![]() For example, if your tasks scenarios are too specific and point people to specific menu items, this might yield fewer problems than if you used a more abstract scenario. One caution on the use of task scenarios is that the level of detail you provide may affect the number of problems you find. The level of detail of these descriptions will vary with the particular deliverable being inspected. ĭescriptions of the context and tasks descriptions or scenarios.Ī profile of the users or personas that are important for the deliverable you are reviewing.Inspection instructions (these will vary depending on whether you are evaluating documents, prototypes, storyboards, etc.). The inspection packet contains most of the documents that are required for a formal usability inspection. DPI still performs the same checks that SPI does however, DPI will also look at the contents of a packet and check it against known patterns or signatures. To take SPI a step further, Deep packet inspection came along. ![]() As the ports are closed when the requested transactions are completed, this provides another layer of security by not leaving these ports open to be attacked. This allows your firewall to dynamically conform to the needs of your applications and open or close ports as needed. This information is stored in a dynamically updated state table, and any communication not explicitly allowed by a rule in this table is denied. This means that the firewall is aware of specific application communication requests and knows what should be expected out of any given communication session. The primary feature of stateful inspection is the monitoring of application and communication states. It’s also more secure than a packet filtering firewall, due to the application layer awareness as well as the introduction of application and communication-derived state awareness. In addition, it’s much faster than an application layer gateway due to the way packets are handled. ![]() Stateful inspection technology supplies application layer awareness without actually breaking the client/server architecture by disassembling and rebuilding the packet. It overcomes the drawbacks of both simple packet filtering and application layer gateways, while enhancing the security provided by your firewall. Stateful packet inspection (SPI) is a compromise between these two existing technologies. Jeremy Faircloth, in Enterprise Applications Administration, 2014 Stateful Packet Inspection Firewalls
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