Which of the following is an example of outbound traffic flow?

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Outbound traffic flow refers to data that is leaving a system and being sent to external destinations, such as other servers or services. In this case, outgoing Prisma Public Cloud API calls exemplify outbound traffic because they involve the system initiating requests and sending data to outside services in the cloud environment. This is a direct example of a system actively engaging and communicating with other external entities, which characterizes outbound flow.

The other scenarios primarily describe inbound requests or activities originating from within the system itself rather than actively sending data out. A web server receiving requests describes incoming traffic. Similarly, the security patch request from Microsoft Windows is also an example of incoming data, as it involves the system receiving updates rather than sending them. Finally, executing the apt-get install command on an instance deals with fetching software packages, which again represents an incoming traffic scenario rather than outbound.