What type of filter would you use to block internet traffic from accessing your Junos OS device while allowing outgoing traffic?

A stateless filter is appropriate for the task of blocking incoming internet traffic while allowing outgoing traffic because it operates on a per-packet basis without maintaining information about the state of connections. In essence, this filter examines each packet independently rather than considering whether packets are part of an established connection.

When configuring such a filter, you would set rules that define which types of incoming packets are to be dropped, essentially protecting the device from external threats. Meanwhile, outgoing packets are not scrutinized in the same way and can be permitted based on the defined rules.

This approach is particularly effective in simple scenarios where a quick assessment per packet is required, and it simplifies the filtering process without the overhead of maintaining connection state information, which is a hallmark of stateful filters. Thus, a stateless filter is well-suited for the requirement of enforcing outbound traffic while restricting inbound traffic at the device level.