Networking Concepts (Basic → Intermediate) 1 Day Study Guide

Networking Concepts: From Zero to Exam‑Ready

A clear, no‑fluff guide to core networking concepts, ending with a focused 1‑day study plan.

What Is a Network?

A computer network is a group of devices that communicate to share data and resources. Communication follows rules called protocols.

Real world idea: sending a letter works because both sides agree on address format. Networks work the same way.

Types of Networks

• LAN – small area like home, school, office
• WAN – large area, the internet is the biggest one
• MAN – city‑scale network
• PAN – personal devices like phone ↔ earbuds

The OSI Model (Very Important)

The OSI model explains how data moves from one device to another. Think of it as a delivery pipeline.

• Physical – cables, signals
• Data Link – MAC addresses, switches
• Network – IP addresses, routing
• Transport – TCP, UDP
• Session – session control
• Presentation – encryption, format
• Application – HTTP, FTP, DNS

Exam trick: if it involves IP think Layer 3. If it involves ports think Layer 4.

TCP/IP Model

A simplified real‑world version of OSI. Used by the internet.

• Network Access
• Internet
• Transport
• Application

IP Addresses

An IP address identifies a device on a network. It is like a house address.

• IPv4 – 32‑bit, example: 192.168.1.1
• IPv6 – 128‑bit, created due to IPv4 exhaustion

Private IP ranges are not routable on the internet.

Subnetting (Intermediate Core)

Subnetting divides a network into smaller networks. It improves performance and security.

• Subnet mask defines network vs host bits
• CIDR notation like /24
• Smaller subnets mean fewer hosts

If subnetting scares you, good. That means it’s important.

Networking Devices

• Hub – broadcasts everything (ancient)
• Switch – uses MAC addresses
• Router – routes using IP
• Firewall – filters traffic

Common Protocols You Must Know

• HTTP / HTTPS – web traffic
• FTP – file transfer
• SMTP – sending email
• DNS – name to IP resolution
• DHCP – automatic IP assignment

1‑Day Networking Exam Study Guide

Morning (Foundation)

• What is a network
• LAN vs WAN vs MAN
• OSI model layers and purpose

Midday (Core Skills)

• TCP vs UDP differences
• IP addressing basics
• Private vs public IP
• Subnet mask meaning

Afternoon (Intermediate)

• Subnetting practice
• Router vs switch questions
• DNS and DHCP workflows

Evening (Exam Polish)

• Common ports review
• OSI layer troubleshooting questions
• Quick mock test

Don’t try to learn everything in one day. Focus on understanding how data flows.

Do your own research before relying on any single guide. This post is for learning support, not blind memorization.