ICS456 – 60 Realistic Scenario Questions and
Answer | 2026 latest Update
1.
A utility installs a monitoring server inside the Electronic Security Perimeter (ESP) that
collects logs from several BES Cyber Systems but does not directly control grid operations. How
should this device most likely be classified?
A. High Impact BES Cyber System
B. Protected Cyber Asset
C. Transient Cyber Asset
D. Low Impact BES Cyber System
Correct Answer: B
Rationale:
The server supports BES Cyber Systems within the ESP but does not directly perform
operational reliability functions, making it a Protected Cyber Asset (PCA).
2.
During a compliance review, an engineer installs an unauthorized software update on a Medium
Impact BES Cyber System without prior approval. Which CIP requirement is most directly
violated?
A. CIP-010 Configuration Change Management
B. CIP-004 Personnel Training
C. CIP-008 Incident Response
D. CIP-006 Physical Security
Correct Answer: A
Rationale:
CIP-010 requires formal authorization, documentation, and testing of configuration
changes.
3.
,A contractor connects a laptop to a relay management network for maintenance work but
disconnects it after the work is complete. How should the laptop be classified under CIP
definitions?
A. BES Cyber Asset
B. Protected Cyber Asset
C. Transient Cyber Asset
D. EACMS device
Correct Answer: C
Rationale:
Transient Cyber Assets are temporary devices connected to BES Cyber Systems for
maintenance or operations.
4.
A utility detects repeated failed authentication attempts targeting remote access to an ESP
gateway. Which system would most likely detect this behavior?
A. SIEM
B. IDS
C. EACMS
D. Patch management system
Correct Answer: C
Rationale:
Electronic Access Control Monitoring Systems track authentication attempts into ESPs.
5.
A transmission operator allows a vendor to remotely access equipment using a VPN. Which CIP
control is most critical to ensure compliance?
A. Multi-factor authentication
B. Network compression
C. Printer authentication
D. Static IP assignment
Correct Answer: A
, Rationale:
Remote access to BES Cyber Systems requires strong authentication such as MFA.
6.
A cyberattack causes malicious configuration changes to a generation control server. What stage
of incident response should occur immediately after identifying the breach?
A. Containment
B. Recovery
C. Documentation
D. Compliance review
Correct Answer: A
Rationale:
The first priority after detection is containing the attack to prevent further damage.
7.
A compliance audit reveals incomplete documentation of firewall rule changes around an ESP.
Which CIP requirement is implicated?
A. CIP-010
B. CIP-003
C. CIP-004
D. CIP-011
Correct Answer: A
Rationale:
Firewall configuration changes must follow formal configuration management procedures.
8.
A BES Cyber System relies on external vendor software updates that are automatically installed.
What supply chain control should be implemented to reduce risk?
A. Firmware validation
B. Printer authentication
Answer | 2026 latest Update
1.
A utility installs a monitoring server inside the Electronic Security Perimeter (ESP) that
collects logs from several BES Cyber Systems but does not directly control grid operations. How
should this device most likely be classified?
A. High Impact BES Cyber System
B. Protected Cyber Asset
C. Transient Cyber Asset
D. Low Impact BES Cyber System
Correct Answer: B
Rationale:
The server supports BES Cyber Systems within the ESP but does not directly perform
operational reliability functions, making it a Protected Cyber Asset (PCA).
2.
During a compliance review, an engineer installs an unauthorized software update on a Medium
Impact BES Cyber System without prior approval. Which CIP requirement is most directly
violated?
A. CIP-010 Configuration Change Management
B. CIP-004 Personnel Training
C. CIP-008 Incident Response
D. CIP-006 Physical Security
Correct Answer: A
Rationale:
CIP-010 requires formal authorization, documentation, and testing of configuration
changes.
3.
,A contractor connects a laptop to a relay management network for maintenance work but
disconnects it after the work is complete. How should the laptop be classified under CIP
definitions?
A. BES Cyber Asset
B. Protected Cyber Asset
C. Transient Cyber Asset
D. EACMS device
Correct Answer: C
Rationale:
Transient Cyber Assets are temporary devices connected to BES Cyber Systems for
maintenance or operations.
4.
A utility detects repeated failed authentication attempts targeting remote access to an ESP
gateway. Which system would most likely detect this behavior?
A. SIEM
B. IDS
C. EACMS
D. Patch management system
Correct Answer: C
Rationale:
Electronic Access Control Monitoring Systems track authentication attempts into ESPs.
5.
A transmission operator allows a vendor to remotely access equipment using a VPN. Which CIP
control is most critical to ensure compliance?
A. Multi-factor authentication
B. Network compression
C. Printer authentication
D. Static IP assignment
Correct Answer: A
, Rationale:
Remote access to BES Cyber Systems requires strong authentication such as MFA.
6.
A cyberattack causes malicious configuration changes to a generation control server. What stage
of incident response should occur immediately after identifying the breach?
A. Containment
B. Recovery
C. Documentation
D. Compliance review
Correct Answer: A
Rationale:
The first priority after detection is containing the attack to prevent further damage.
7.
A compliance audit reveals incomplete documentation of firewall rule changes around an ESP.
Which CIP requirement is implicated?
A. CIP-010
B. CIP-003
C. CIP-004
D. CIP-011
Correct Answer: A
Rationale:
Firewall configuration changes must follow formal configuration management procedures.
8.
A BES Cyber System relies on external vendor software updates that are automatically installed.
What supply chain control should be implemented to reduce risk?
A. Firmware validation
B. Printer authentication
