Diebold Nixdorf Security Engineer Interview Questions and Answers

Natting stands for Network Address Translation, a process used to modify network address information in packet headers while in transit.

• Natting allows multiple devices on a local network to share a single public IP address

• Types of Natting include Static NAT, Dynamic NAT, and Port Address Translation (PAT)

• Natting helps improve security by hiding internal IP addresses from external networks

• Example: A company uses NAT to ...read more

Port numbers for different protocols

• HTTP - 80

• HTTPS - 443

• FTP - 20, 21

• SSH - 22

• SMTP - 25

• DNS - 53

• POP3 - 110

• IMAP - 143

• LDAP - 389

• RDP - 3389

Steps to take after a phishing attack

• Immediately disconnect from the internet

• Change all passwords associated with the compromised account

• Notify the appropriate parties (IT department, bank, etc.)

• Run a virus scan on all devices used to access the compromised account

• Educate yourself and others on how to identify and avoid phishing attacks

Monitoring and analyzing security measures to protect an organization's computer systems and networks

• Monitoring security measures to ensure they are effective

• Analyzing security breaches to determine the cause and prevent future incidents

• Implementing security protocols and procedures

• Conducting regular security audits and risk assessments

Qualys API allows for automated security assessments and reporting, and can be accessed using Python for scripting and automation.

• Qualys API provides endpoints for scanning, reporting, asset management, and more.

• Python can be used to interact with the Qualys API by sending HTTP requests and handling responses.

• Examples of using Qualys API with Python include automating vulnerability scans, retrieving scan reports, and m

I primarily use the following Python libraries: requests, BeautifulSoup, pandas, numpy, scikit-learn, matplotlib.

• requests: for making HTTP requests

• BeautifulSoup: for web scraping

• pandas: for data manipulation and analysis

• numpy: for numerical computing

• scikit-learn: for machine learning

• matplotlib: for data visualization

The event life cycle of a SIEM solution involves several stages from data collection to incident response.

• Data collection: SIEM collects logs and events from various sources such as network devices, servers, and applications.

• Normalization: The collected data is normalized to a common format for easier analysis and correlation.

• Aggregation: Events are grouped together based on common attributes to identify patterns and t...read more

The OSI model is a conceptual framework that defines the functions of a network protocol stack.

• The OSI model consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and interacts with the layers above and below it.

• The model helps in understanding how data is transmitted and received in a network.

• For example, the Physical layer deals wi...read more