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Which of the following is the most secure to use?
stateless firewalls
application-level proxy
Stateful packet filtering
circuit-level proxy
Stateful packet filtering (SPI) has intelligence in that it keeps track of every communications channel. Pure packet filtering has no real intelligence. It allows data to pass through a port if that port is configured and otherwise discards itâit doesnât examine the packets. Reference: Sybex CompTIA Security+ Study Guide SY0-401, 6th Edition. EDIT: Removed the acronym
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