OT security lab · Level 4 of 8
Remote access: the vendor comes in through the DMZ
Level 4 of 8 in the OT security lab: a free OT security exercise at Intermediate level. A vendor needs to look at one PLC. Route the session through the DMZ gateway and jump host, with approval, a named account, a time limit and a recording.
Free · no download. Your work is saved on this device. Updated 18 Oct 2026.
The brief
- Client
- Tormund Bottling Works
- Site
- Filling line 2, Tormund
- Work order
- WO-OTS-104
- Task code
- OTS-04
- Difficulty
- Intermediate
- Type of work
- Configuration
A vendor needs to look at one PLC. Route the session through the DMZ gateway and jump host, with approval, a named account, a time limit and a recording.
Skills you practise
- Remote access through a DMZ
- Jump host
- Approval and logging
- Least privilege
What the test checks
The acceptance test marks the skills this level practises.
- Remote access through a DMZ
- Jump host
- Approval and logging
- Least privilege
In this lab
- Purdue levels, zones and conduits
- Firewall rules, remote access and logs
- Patch plans, backups and an incident drill
Levels in the OT security lab
Previous: Firewall rules: the minimum, then deny by defaultNext: Spot the intruder: the events that matter in a day's log
- Map the plant network: put every device on its level
- Zones and conduits: split a flat network
- Firewall rules: the minimum, then deny by default
- Remote access: the vendor comes in through the DMZ
- Spot the intruder: the events that matter in a day's log
- Patch or protect: choose within the maintenance window
- Backup and recovery: known-good copies and a proved restore
- Incident drill: a simulated note on an operator screen
Part of the OT security lab
Map a plant network, split it into zones, write the firewall rules, read the logs and run the response drill.
Feeds these internships: SCADA and HMI.