Traditionally, firewalls are designed to monitor states of network traffic, using stateful packet inspection (SPI) to make decisions about the risk from incoming traffic and resource requests.

But there is a trade-off between performance gains and security. Stateful packet filters use a state table to keep track of which packets should be permitted through the firewall, and this state ...

Historically, firewalls have been the primary stateful network device. Operating at the WAN boundary to protect an organization from incoming traffic, a firewall’s relatively slow throughput ...