OPC UA Communication Standard Security Quiz

1. Which signing algorithm is commonly used in OPC UA for message integrity?

SHA-1 exclusively

SHA-256

CRC-32 only

MD5 primarily

2. Which OPC UA component is responsible for enforcing access control policies?

Router

Authorization Service on the Server

Network hub

Client application only

3. What role does the OPC UA gateway play in legacy system integration?

Blocks all legacy device communications

Bridges non-OPC UA devices to OPC UA networks

Eliminates security requirements

Increases network latency intentionally

4. Which OPC UA security policy uses SHA-1 for signing?

Basic128Rsa15

Basic256

Basic256Sha256

Aes128_Sha256_RsaOaep

5. What is the purpose of OPC UA discovery services?

Monitor server performance metrics

Locate and identify available OPC UA servers

Encrypt network traffic only

Manage user access levels

6. OPC UA endpoints are typically secured using which certificate type?

Self-signed certificates only

X.509 certificates

SSH key pairs exclusively

Symmetric shared keys

7. Which component manages subscriptions in OPC UA?

Firewall

OPC UA Server

Network switch

DNS server

8. What is the minimum recommended key length for Basic256 encryption in OPC UA?

128 bits

192 bits

256 bits

512 bits

9. OPC UA uses which model for data organization?

Flat file structure

Hierarchical object-oriented model

Relational database only

Key-value pairs exclusively

10. What is a session in OPC UA architecture?

Physical connection between servers

Logical connection between client and server for operations

Storage of historical data

Network packet transmission

11. What does OPC UA stand for in industrial automation?

OLE for Process Control Unified Architecture

Open Protocol Control Universal Application

Operational Process Communication Unified Access

Optimized Protocol for Control Universal Architecture

12. What does the OPC UA address space represent?

Physical server storage capacity

Hierarchical structure of nodes and variables

Network bandwidth allocation

Encryption key storage

13. OPC UA supports interoperability between different manufacturers' devices. What enables this?

Proprietary protocols

Standardized data models and services

Hardware compatibility only

Shared source code

14. Which OPC UA security mode provides no encryption?

Sign

SignAndEncrypt

None

Basic256

15. What is the role of a Certificate Authority (CA) in OPC UA security?

Monitor network traffic only

Issue and validate digital certificates for authentication

Encrypt all data in transit

Manage firewall rules

16. OPC UA Part 4 defines which aspect of the standard?

Transport protocols

Data model and services

Security mechanisms

Historical data access

17. Which authentication method is supported by OPC UA?

Username and password only

Certificate-based authentication

Biometric authentication exclusively

MAC address filtering

18. What is the primary purpose of OPC UA in industrial environments?

Replace all legacy PLC programming languages

Enable secure, standardized data exchange between devices

Eliminate the need for firewalls in networks

Provide physical layer security only

19. OPC UA uses which encryption standard for securing communications?

DES

AES

RC4

MD5

20. Which transport protocol is NOT commonly used by OPC UA?

TCP/IP

MQTT

HTTP/HTTPS

UDP

SecOT+ OPC UA Communication Standard Quiz