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Short lessons that explain one thing properly. Search for a word, or pick a subject and read it through from the basics.

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8 of 58 lessons about Networks Show all lessons

Cyber security fundamentals

How attacks work, in plain words: ransomware, phishing, malware and the flaws they use.

1 of 8 lessons shown

  1. What is a DDoS attack? A DDoS attack floods a website or online service from many devices at once until real users cannot get through. How it works and how to prepare. Beginner 3 min read

Data security and encryption

How data is kept unreadable to anyone who should not see it: encryption, certificates, TLS and hashing.

1 of 8 lessons shown

  1. What is TLS? TLS is the protocol that secures a connection between two computers. What it promises, how the handshake works, and which versions to allow. Intermediate 3 min read

Networks and business IT

The equipment in the comms cupboard and what it does: addresses, routers, firewalls, VLANs and VPNs.

6 lessons

  1. What is an IP address? An IP address is the number that tells the internet where a device is. What IPv4 and IPv6 look like, who hands addresses out, and what to ask. Beginner 3 min read
  2. Public IP vs private IP addresses A public address can be reached from anywhere. A private one only works inside your office. What that means for remote access and hosting. Intermediate 3 min read
  3. Router vs switch vs access point: what’s the difference? A router joins your office to the internet, a switch connects wired devices, and an access point provides Wi-Fi. How to tell which one you need. Intermediate 3 min read
  4. What is a firewall? A firewall decides which network traffic may pass and which is blocked. The two kinds, what a firewall cannot stop, and what to check on yours. Beginner 3 min read
  5. What is a VLAN? A VLAN splits one office network into several separate ones on the same cables. What it is used for, and the equipment it needs. Intermediate 3 min read
  6. What is a VPN? People use “VPN” for two different things: a secure link to the office network, and a privacy service. What each one does and does not do. Beginner 3 min read

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