Full Cybersecurity Course From 0: Ethical Hacking & Defense

Build a solid foundation in computer networking with the OSI model, protocols, cryptography, and essential terms and commands through engaging animations.

Learn what a server is—a computer configured to provide services—and explore common types like web, mail, file, database, and DNS servers, plus basic setup steps.

Identify what an internet service provider is and how it delivers home connectivity. Explore broadband types such as cable, DSL, fiber optics, and satellites, including Starlink, and understand ISP installation.

Explain ethernet cables and RJ45 connectors that create wired connections, linking computers to switches and routers to access resources, and show how to locate LAN port for a wired connection.

Explore how routers connect LANs to the internet by routing packets using IP addresses (and MAC basics), and differentiate wireless and wired routers with a built in switch.

Explore the star topology, where devices connect to a central switch via an Ethernet cable and data flows through the switch, highlighting security, fault tolerance, and central device failure risk.

The session layer manages sessions, authentication, authorization, and checkpoints to resume data exchange across devices. It assigns unique session IDs and maintains multiple concurrent sessions, terminating when you log out.

Understand how the transport layer regulates data flow with window size and ensures error-free delivery using checksums and ARQ. Compare TCP's reliable, connection-oriented delivery with UDP's fast, unreliable data transmission.

Compare old and updated tcp/ip models, noting the internet layer renamed to network, the link layer split into data link and physical, and the first three layers merged into application.

Learn how a DHCP client requests an IP address from a DHCP server, and how routers typically act as the DHCP server to manage IP allocation.

Discover how the ARP protocol maps IP addresses to MAC addresses, enabling data exchange by finding the receiver's MAC via broadcast and storing mappings in the ARP table and cache.

Learn to view a website's IP addresses using PowerShell and the resolve-dns name command, which returns IPv4 and IPv6 addresses.

Explains asymmetric encryption using public and private keys to encrypt with the recipient's public key and decrypt with the corresponding private key, solving the key sharing problem.

Explore the basic structure of hashing functions and compare md5 with the sha family, including md5’s 128-bit output and sha variants of 160, 256, and 512 bits expressed in hex.