Hi,
In fact, it could be any of the questions you'll find in
this forum :
1. Server administration
2. Install
3. Troubleshooting
4. ESUs, ASUs and upgrade, Service Packs and Tools
5. JDE Security
6. Performance
7. OMW, menus, tasks, DD and user admin
8. Printers
9. Objects, versions, DS, OCM
10. Pathcodes and environments
They can also ask you a bunch of questions about their
particular environment : AS/400 or UNIX or Windows,
Oracle, SQL, UDB or DB2/400, Web or Citrix or Fat,
clustering, failover, node balancing, SSL encryption,
HTTP, whatever. In a few words, expect the unexpected!
Good luck