Firewalls are a good thing. They protect our data. In GIS, we regularly use firewalls to filter how people can access our network and what leaves our server. There are over 61,000 Ports or holes that we can open for a firewall.
After a decade as a GIS professional I have a decent understanding of titles and salary expectations that come with it. Here is my list. There are more titles out there but these are the most abundant. The salaries are from Indeed.