Network and Cyber Security Essentials
Understand how data travels across the internet and how to protect it from threats. Learn practical defensive skills, from securing networks to deflecting cyberattacks.
Like Duolingo, but for Network and Cyber Security Essentials. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
23 levels across 3 sections, about 46 minutes end to end, roughly 9 days at five minutes a day. It moves through Taking Control of Personal Security, How Data Moves and Where It Is Exposed, and Defensive Architecture and Incident Response. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Network and Cyber Security Essentials
- Adding extra length expands the guessing pool exponentially compared to swapping a few symbols into predictable spots
- Humans tend to follow predictable patterns like capitalizing the first letter and putting numbers or exclamation marks at the end
- A multi-word passphrase is easy to remember yet astronomically harder for automated password crackers to brute-force
- Attackers take leaked username-and-password pairs and run them automatically against hundreds of other services (credential stuffing)
- Password managers generate unique credentials per website, so a leak at one company isolates the damage to that single account
- Passwords only prove 'something you know', whereas MFA demands an independent factor like 'something you have'
- Even when an attacker enters valid credentials, authentication halts until the second physical proof is satisfied
- SMS verification codes travel across cellular networks and can be rerouted via SIM swapping or intercepted over signaling protocols
- Authenticator apps generate time-based codes locally on the device without relying on phone carrier networks
- Physical security keys plug in or use NFC, cryptographically proving the exact website you are on to block phishing directly
- Answers to standard security questions like mother's maiden name or high school mascot can often be discovered through public records or social media
- Linking a secondary recovery email that lacks two-factor authentication lets attackers take over the main account by hijacking the weaker inbox
- Account recovery flows frequently bypass normal login friction, making them high-priority targets for account takeover
- Phishing lures artificially compress time to prevent deliberate verification
- Legitimate system changes rarely demand immediate punitive action within minutes
- Fear of negative consequences (losing pay, account lockout) is used to bypass critical thinking
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Network and Cyber Security Essentials the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Imagine an attacker guessing passwords. What predictable human habit makes their job surprisingly easy?
Get it right to open this lesson and 22 more in the app.
Where Network and Cyber Security Essentials takes you
- 1
Taking Control of Personal Security
- Hardening Authentication and Everyday Access
- Spotting and Deflecting Social Engineering
- 2
How Data Moves and Where It Is Exposed
- Following a Packet Across the Internet
- Guarding Local Networks and Wi-Fi
- 3
Defensive Architecture and Incident Response
- Filtering and Controlling Network Traffic
- Protecting Data with Cryptography
- Diagnosing Malware and Containing Breaches
3 sections · 7 units · 23 levels. Built to play, not to enroll.
You pick the voice
Network and Cyber Security Essentials is taught in the The Storyteller style: every lesson is a story. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Network and Cyber Security Essentials today.
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