Networking & cybersecurity
12 lessons from “what is a network” to IP addressing and subnetting, linking branches with VPNs, then protecting it all: the CIA triad, defence in depth, spotting phishing and incident response. With a subnet calculator and hands-on tools.
Lessons
What is a network and why does it matter?
What a network is, its sizes, and its role in every company.
Network devices and topologies
Switches, routers, access points and firewalls, and the shapes networks take.
The OSI and TCP/IP models
The seven layers and why we split networking into layers.
IP addressing
IPv4 format, private vs public addresses, DHCP, DNS and NAT.
Subnetting
Splitting a big network into smaller ones, with an interactive calculator.
The journey of a request: what happens when you open a website?
Every step from joining the network until the page appears.
Connecting networks together
Default gateways, VLANs, and linking branches with VPNs.
Protocols and ports
Well-known ports, and secure versus insecure protocols.
Wireless networks and the cloud
Wi-Fi security, cloud models, and who is responsible for what.
Cybersecurity fundamentals
The CIA triad, threats, vulnerabilities and risk, and common attacks.
Protection and prevention
Defence in depth, MFA, backups and Zero Trust.
People, phishing and incident response
Spot phishing, handle an incident step by step, and the careers in this field.