Network for you - Invidious

Network for you IT Institute. (Popular for free Cisco CCNA 200-301 Training.)

We are Team of Senior Engineers have more than 12 years experiences and providing CISCO Training classroom, on-site and online training on various Networks, Python for Network Engineer, CISCO Certifications Like CCNA 200-301, CCNP ENCOR 350-401, CCNP ENARSI 300-410 and Firewall etc. Also working as full time as MSO (Mobile Switching Office) Engineer.
Certifications:
Cisco Certified Network Professional CCNP (350-401-ENCOR and 300-410-ENARSI)

Our mission is to explain complex networking topics as simple as possible for you.
This site is dedicated to helping students understand complex networking topics. We do our level best to explain things as simple as possible to help people who want to pass the Cisco CCNA 200-301, CCNP and Firewall.

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Network for you

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Network for you

what is Firewall?

A firewall is a security system that protects a computer, network, or device by controlling incoming and outgoing traffic based on predefined rules.

🔒 What it does

Think of a firewall as a digital gatekeeper. It:

Monitors data trying to enter or leave a system
Blocks suspicious or unauthorized access
Allows safe and trusted communication
🧠 Simple example

If your computer is connected to the internet, many requests try to reach it. A firewall checks each request and:

lets safe ones pass
blocks harmful ones (like hackers or malware)
⚙️ Types of firewalls
Hardware firewall – a physical device (often used in offices or routers)
Software firewall – installed on your computer (like in Windows Defender Firewall)
Network firewall – protects entire networks
Application firewall – protects specific apps or services