A firewall is a security system that filters incoming and outgoing network traffic based on rules to block unauthorized access.

What is a DDoS attack?

A Distributed Denial of Service (DDoS) attack floods a network or server with traffic from many sources to overwhelm it and take it offline.

Intermediate🖼️ 20 slides⏱ 4 minCybersecurity

🛜 Network Security

Network security protects data as it moves across networks from attacks and unauthorized access. This visual guide covers firewalls, VPNs, encryption, intrusion detection, segmentation, and common attacks like DDoS and man-in-the-middle.

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What Is Network Security?

Protecting data and devices as they communicate over networks.

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The CIA Triad

Confidentiality, integrity, and availability.

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What Is a Firewall?

Filters traffic to block unauthorized access.

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Types of Firewalls

Packet, stateful, and next-gen firewalls.

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What Is a VPN?

Encrypts traffic through a secure tunnel.

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Encryption in Transit

TLS protects data moving across networks.

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Network Segmentation

Split networks to limit attack spread.

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What Is an IDS/IPS?

Detect and block suspicious activity.

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Man-in-the-Middle Attacks

Attackers intercept traffic between parties.

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DDoS Attacks

Flooding a network to take it offline.

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Packet Sniffing

Capturing traffic to read or analyze it.

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Port Security

Close unused ports to reduce attack surface.

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Zero Trust Networking

Verify everything; trust nothing by default.

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Secure Wi-Fi

Strong encryption (WPA3) and passwords.

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NAC (Network Access Control)

Control which devices can join.

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Monitoring and Logging

Track traffic to spot attacks.

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Network Hardening

Patch, configure, and minimize exposure.

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Common Mistakes

Default passwords and open ports.

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Defense in Depth

Layer multiple protections together.

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Getting Started

Map your network and close unnecessary access.

Frequently Asked Questions

Network security is the practice of protecting data and devices as they communicate over networks from attacks, interception, and unauthorized access.