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Computer Networking Fundamentals

04 Networking

Computer Networking Fundamentals

Learn how data actually crosses a network, from the OSI model to a packet capture you can read line by line.

Levels
04
Skill Range
Beginner → Expert
Track
Networking
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Computer Networking Fundamentals
From 242CREDS

Everything else in this catalogue assumes you can read a network. This course makes sure you can. You will work through the OSI and TCP/IP models as practical tools rather than exam trivia, then follow a single request down the stack and back up the other side. IP addressing and subnetting are taught until they are quick rather than laborious, including CIDR, VLSM, and IPv6. You will study switching, ARP, and VLANs at layer two, routing and NAT at layer three, and TCP against UDP behaviour where it matters. DNS, DHCP, HTTP, and TLS are examined in Wireshark so you see what each protocol really sends. Every module ends with a capture you analyse yourself.

Curriculum

Learning Path

Each level is enrolled separately. Work through them in order, or start at the level that matches your experience.

  1. Level 01

    Beginner

    242 CREDS

    Purpose

    Learn the models as working tools, so you can follow a request down the stack and back.

    Outcome

    You can follow a request through the network stack.

    What You'll Learn
    • Work through the OSI and TCP/IP layers with a single request as the example.
    • Identify what each layer adds and removes.
    • Trace one HTTP request from application down to the wire.
  2. Level 02

    Intermediate

    485 CREDS

    Purpose

    Make addressing and subnetting quick rather than laborious.

    Outcome

    You can plan and subnet an address space confidently.

    What You'll Learn
    • Subnet with CIDR and VLSM until the arithmetic is fast.
    • Plan an addressing scheme that leaves room to grow.
    • Work with IPv6 addressing alongside IPv4.
  3. Level 03

    Advanced

    698 CREDS

    Purpose

    Understand switching and routing by watching the protocols do their work.

    Outcome

    You can explain how switching and routing move a packet.

    What You'll Learn
    • Study ARP, VLANs, and switching behaviour at layer two.
    • Follow routing and NAT decisions at layer three.
    • Compare TCP and UDP behaviour where the difference matters.
  4. Level 04

    Expert

    1,071 CREDS

    Purpose

    Read real protocols in a capture, since that is what you will actually debug.

    Outcome

    You can diagnose a problem from a packet capture.

    What You'll Learn
    • Examine DNS, DHCP, HTTP, and TLS exchanges in Wireshark.
    • See what each protocol really sends rather than what documentation claims.
    • Analyse a capture and explain a failure from the packets alone.