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IoT Security

Technology Fundamentals

IoT Security

1 min readPublished 22 Jul 2026

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The Internet of Things (IoT) — cameras, sensors, smart devices — adds huge numbers of often poorly-secured devices to networks, expanding the attack surface dramatically.

Interactive explainer

IoT Security

Securing the flood of connected devices.

1The devices2The risks3Segment4Harden & manage

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The devices

Many, small, everywhere.

Cameras, sensors and smart devices add huge numbers of internet-connected endpoints — often with weak security and little visibility.

Check your understanding

1. What is a top IoT risk?

2. How should IoT devices be networked?

Keep learning

IoT SecurityOT & ICS Security CompTIA Security+
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The risks and controls

  • Default credentials — many devices ship with weak, well-known passwords (a top IoT risk). Change them.
  • Poor update mechanisms — devices are rarely patched, leaving known vulnerabilities.
  • Botnets — compromised IoT devices are conscripted into large botnets (e.g. Mirai) for DDoS.
  • Controls — segment IoT onto its own network (segmentation), harden and inventory devices, and manage their lifecycle.

IoT blurs into OT/ICS in industrial settings. The principle is the same: you can't fully trust the device, so isolate and monitor it — a zero trust approach.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

IoT proliferation makes device security a practical, growing concern across every sector.

Technical questions
What are the main IoT security risks and controls?+

Default creds, poor updates and botnets; controls are segmentation, hardening, patching and inventory.

Behavioural questions
Tell me about securing something outside your usual scope.+

Show applying core principles (zero trust, segmentation) to a new class of device.

Real-world scenarios
“Hundreds of smart cameras are added to the corporate network.”+

Expected answer: Segment them onto an isolated VLAN, change defaults, restrict traffic, and monitor — assume they can't be trusted.

Practise in AI Interview™Rehearse these questions, scored.Plan with Career Coach™A personalised path to your goal.Evidence it in Career Passport™Prove this skill to employers.

Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles
Security EngineerNetwork Security EngineerIoT Security Analyst
Skills you're proving
IoT securitySegmentationDevice hardening
Recommended certifications
CompTIA Security+
Career progression

Cyber Fundamentals → IoT/Network Security.

What employers expect

That you understand core security principles and can apply them to real risks, controls and incidents.

Frequently asked questions

Why are IoT devices a security risk?

They often ship with default credentials, are rarely patched, and add many hard-to-monitor devices to the network.

What is an IoT botnet?

A network of compromised IoT devices (e.g. Mirai) controlled by an attacker, often used for large DDoS attacks.

How do you secure IoT devices?

Change default credentials, segment them onto their own network, keep firmware updated, and inventory/monitor them.

Related guides

Cyber Security Fundamentals: Principles, Threats, Defence & OperationsSecurity Principles: CIA, Defence in Depth & Zero TrustRisk Management & GovernanceThreat Actors & Threat Intelligence

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