Understanding Networks Devices

This page gives information about internet basics

What is internet?

Before understanding the internet first we need to understand what is network?

Basically A network is a combination of Computer , wire and rules.

  • Computer + wire + rules = Network. A network may be a local in which 2-3 computers are connected to each other. When several local networks are connected to each other then a large network of networks is created which is called internet. internet is created by laying thousand Kms of cable across the globe / under oceans to connect one continent to another continent.

  • So Internet is a global network of computers connected to each other.

  • Internet is not a one device, it is created by many network devices working together, each doing one boring but specific job - very well. even one role is missing, the internet collapes.

Network Devices

1. End Devices ( Clients & Servers)

  • Phones, Laptops, IoT Devices,

  • Web servers, Cloud Servers

2. Switch - The local connector

Analogy- A Switch is a office receptionist who knows exactly where each employ sits and routes mail correctly.

  • A switch connects devices inside a local networks ( home, office, data center)

  • It keeps track of which device is on which port.

  • Sends data only where it's needed.

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3. Router - The decision Maker

Analogy- A router is like a GPS-enabled traffic controller deciding which road your data should take to reach another city.

  • A router connects different networks together.

  • it chooses the best path for data.

  • connects your local network to other network.

  • understands IP addresses.

4. Modems - The translators

Analogy - A modem is a language translator at the border between your home and the ISP’s infrastructure

  • A modem connects your network to your Internet Service Provider (ISP)

  • Converts digital data into signals suitable for cables/fiber.

  • Converts incoming signals back into digital data.

5. ISP Core Network - The backbone

Analogy - the long distance Highways connecting cities, countries and continents.

  • ISP Uses-

    • High Capacity Routers.

    • Fiber optic links.

    • Undersea cables?

    • Those are physical fiber links connecting backbone routers across oceans.

6. Firewalls - The Gatekeepers

A firewall is a security checkpoint.

  • A firewall decides what traffic is allowed or denied.

  • Security on the internet lives here.

  • what it does-

    • Blocks malicious traffic.

    • Enforces security rules.

    • Protects networks and servers.

7. Load balancers - The Traffic distributors

Analogy - A load balancer is a smart receptionist sending the customers to the least busy counter,

  • what they do --

    • Distributes traffic across multiple servers.

    • Improve availability and reliability.

    • enable scaling.

  • Modern websites depends on load balancers to survive real traffic.

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