In which setting is a firewall that accepts selected incoming connections typically used when other systems are mostly trusted?

In a work environment, firewalls that accept selected incoming connections are typically used because this setting often involves a more controlled and trusted network. Within such an environment, organizations usually have established security protocols and trust levels among internal devices and users. This allows for a more nuanced firewall policy where certain connections can be permitted based on predefined rules while still maintaining overall security.

In contrast, a public setting would not generally allow for any incoming connections due to the high level of risk associated with untrusted networks. An external setting would typically imply a broader network access with less control over who is trying to connect. The DMZ, or Demilitarized Zone, is designed to expose external-facing services to the internet while protecting more sensitive internal networks, and it usually involves stricter controls for incoming connections due to the nature of its purpose. Thus, the emphasis on selected incoming connections in a work environment, where other systems are considered mostly trusted, illustrates why this is the most suitable choice.