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Get to know the Open Systems Interconnection model

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Overview

Throughout this series, we will be tackling the basics such as:
(Part 1) How does DNS work?
(Part 2) Network Stack, OSI Model [You are here!]
(Part 3) HTTP Methods and Formats
(Part 4) Client Identification
(Part 5) Basic/Digest Authentication
(Part 6) HTTPS working with SSL/TLS

OSI Model

The Open Systems Interconnection (OSI) Model is a standardized model for telecommunication in computer systems. It does not regard the underlying technology, but instead the layers involved in communication. Let us explore the different layers within the OSI Model:

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Typical 5-layered OSI Model

1. Application Layer

This layer allows applications to communicate over the network once the connection has been established, such as from the Web Browser (Application) to the Server. …


How does the DNS work, and why is it important?

Overview

Throughout this series, we will be tackling the basics such as:

  • How does DNS work? [You are here!]
  • Network Stack, OSI Model
  • HTTP Methods and Formats
  • Client Identification
  • Basic/Digest Authentication
  • HTTPS working with SSL/TLS

What is HTTP?

HyperText Transfer Protocol (HTTP) is a protocol devised by Sir Tim Berners Lee in 1989. It forms the basis for how web pages communicate from the web server to the client’s browser.

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Sir Tim Berners Lee, the Father of World Wide Web. Photo courtesy of CNET

DNS Servers

Is the connection to the webpage established immediately after typing in the Domain Name, such as medium.com? Definitely not!

Machines, unlike us, recognize the location of webpages by IP Addresses. These string of numbers, such as 104.16.121.127, are more machine friendly especially since there are millions of domain names on the Web. …

About

Cher Don

Serial Hacker | Techie Enthusiast | Data Wannabe

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