The Enduring Debate: Basic IT Knowledge for Senior Security Roles

In the fast-evolving world of cybersecurity, job descriptions for senior roles often feature advanced requirements like AI-driven threat detection, cloud security architecture, or zero-trust frameworks. But what about the fundamentals? A recent Reddit post from r/cybersecurity sparked a lively discussion on this very topic, as a first-time interviewer for a senior Data Security Engineer (5-7 YOE) position, focusing on data classification and CASB, wondered if asking questions about basic IT knowledge like DNS records (A, CNAME), ports, and PKI was still appropriate.

The community's response was overwhelmingly clear: Yes, it is, and then some. This thread illuminates a crucial truth in cybersecurity hiring: foundational knowledge isn't just a baseline for junior roles; it's the bedrock upon which all advanced skills are built, especially for those in senior positions.

The Unanimous Call for Basics: DNS as the Litmus Test

The consensus was immediate and forceful: basic DNS understanding is not just acceptable, it's expected across the board.

  • "Id expect EVERYONE who’s not GRC to understand basic DNS in a security org," remarked one commenter, quickly followed by another asserting, "I’d expect GRC folks to understand it, too." (Comments 1 & 2)
  • Many echoed the sentiment that anyone working in IT, let alone cybersecurity, should grasp DNS fundamentals. As one user bluntly put it, "If you don't know what an A record is you shouldn't working in IT at all, you should be studying and learning." (Comment 21)

For a Data Security Engineer, understanding how DNS works is critical for identifying malicious traffic, securing domain resolution, configuring cloud services, and troubleshooting connectivity issues that could impact data access or integrity. It’s not just about memorizing what an A record does, but understanding its implications for security posture and incident response.

Beyond Memorization: Depth, Problem-Solving, and Communication

While basic knowledge is key, the Reddit thread highlighted the distinction between rote memorization and true understanding. "Everyone *thinks* they understand DNS. Few actually do," noted one insightful comment (Comment 4). This points to a deeper goal for interviewers: not just checking if a candidate knows the definition, but if they understand the operational nuances and can apply that knowledge.

  • Gauging True Understanding: Instead of simple recall, ask questions that require a candidate to explain *how* something works, or *why* it's important. As one comment suggested, "Judge their knowledge of what it does, not always the specifics that can be easily forgotten." (Comment 17)
  • Problem-Solving & Adaptability: Interviewers should use basic questions to "ask slightly harder questions to gauge problem-solving skills" and identify learning agility rather than just knowledge gaps. (Comment 10)
  • Communication is Key: Frame a question like, "explain this to a non-technical person." This assesses not just technical knowledge but the crucial ability to communicate complex concepts clearly – a vital skill for any senior role. (Comment 16)

Expanding the Scope: Other Foundational Pillars

The discussion quickly broadened beyond DNS, reinforcing the need for a holistic grasp of IT infrastructure:

  • PKI and SSH: Questions around Public Key Infrastructure (PKI) concepts, like the classic SSH scenario of a "host authenticity warning" or explaining which key (public or private) goes on an SSH server, were highlighted as excellent gauges of fundamental understanding. Misunderstanding here can point to significant security blind spots. (Comments 12 & 14)
  • Ports & Protocols: While remembering every port number might be Google-able, understanding *what a port is* and *why certain services use specific ones* is non-negotiable.
  • Resume Verification: A powerful technique emphasized was "quizzing the resume" – asking detailed questions about technologies or experiences listed. This not only verifies authenticity but also helps identify candidates who might be using AI to generate answers. (Comments 12 & 13)

Interviewing in the Modern Era: Beyond the Script

The Reddit discussion underscores that interviewing for senior cybersecurity roles requires more than a checklist of technical terms. It's about discerning a candidate's depth, their approach to problem-solving, their ability to communicate, and their genuine experience in an age where AI can provide instant, articulate (but often shallow) answers.

While it's true that even seasoned professionals Google concepts daily, the distinction lies in knowing *what to look for* and *understanding what you are reading*. For a senior Data Security Engineer, a robust foundation in core IT principles is not a nice-to-have; it's a critical enabler for effectively designing, implementing, and defending complex data security solutions.

Key Takeaways

  • Foundational Knowledge is Non-Negotiable: Basic IT concepts like DNS, PKI, and network fundamentals are essential for senior cybersecurity professionals.
  • Assess Depth, Not Just Memorization: Focus on a candidate's understanding of *how* and *why* things work, and their ability to troubleshoot and apply knowledge.
  • Prioritize Communication Skills: Ask candidates to explain technical concepts to non-technical audiences.
  • Verify Experience Diligently: Quiz candidates on their resume and be aware of AI-generated responses.
  • Identify Learning Agility: Use questions to gauge problem-solving skills and identify a candidate's potential to quickly learn and adapt.

Source

https://www.reddit.com/r/cybersecurity/comments/1m829bw/dns_interview_questions_for_a_senior_role/