In large organizations, screening technologies, including static packet filtering, stateful inspection, Network Address Translation, and application proxy filtering, often resides on a specially designated computer separate from the rest of the network, that acts as a gatekeeper to the organization's private network.

$\_\_\_\_\_\_\_\_\_\_$ is$/$are a combination of hardware and software that controls the flow of incoming and outgoing network traffic.

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Digital certificates

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Patches

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A botnet

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A firewall