I came up (I haven’t heard it before) with an easy way of destinguishing between a system administrator and a network administrator. All you have to do to find out if a person is a netadmin or a sysadmin is ask him/her to connect via secure shell to any host of his choice. If a hostname is used, then it is a sysadmin in front of you. If an IP address – it’s a netadmin.
# System administrator ssh firstname.lastname@example.org # Network administrator ssh email@example.com