&gt; If you do a lot of network infiltration, these boxes are among the most useful targets; unlike routers running JunOS, the VPN concentrators have a large outside-the-packet-filter attack surface, and everyone runs them.<p>Don&#x27;t forget that the newer SRX-series VPN gateways are JunOS-based, and seem to be recommended by most Juniper sales people these days. There are certainly a ton of ScreenOS devices, but Juniper seems to have mostly deprecated them in their messaging.<p>The primary Juniper security track certifications are JunOS-focused, and there&#x27;s only a basic specialization available from them for ScreenOS. Juniper has mostly staked their future on JunOS from what I can tell.