14-September-2023 Day 4 of Dairy Writing

 Hello,

The day is over and I feel good because I did acquire a whole lot of new knowledge in Computer Networks. I was supposed to give the amcat test for Concentrix but did not do so. I will give the test tomorrow morning. 

I gained new knowledge in OSI(Open Systems Interconnection) model for network communication, which not used in modern networking. The protocol that is used in Modern networking is TCP/IP (Transmission control protocol/Internet Protocol. OSI has seven layers 

  • Application layer (Firewall, SMTP, HTTP, FTP)
  • Presentation layer
  • Session layer
  • Transport layer (TCP and UDP)
  • Network layer (Routers and Switches with Routing capabilities)
  • Data link layer (Switch(uses Multicasting) and Bridges)
  • Physical layer (Repeaters(wired and wireless, Analog and Digital), Converters and Hub(uses Broadcasting))
While sending data the layers are followed in this way only but on the receiving end the order is reversed.
Top three are software layers i.e. utilizes software. Bottom three are Hardware layer i.e. utilizes Hardware. The Transport layer is the heart of the OSI model.  

The TCP/IP model has only 5 or you can 4 layers i.e. the first 3 layers are combined into one single Application layer. Transport layer and Network layer stays as is, the rest two maybe combined into layer or let them stay as they are.

I also gained knowledge on Stateless and Statefull protocol

Stateless protocols does not maintain any record or error recovery. ex. UDP, HTTP and DNS,

Statefull protocols maintain session data and also provide error recovery. ex. TCP, FTP and Telnet.

I completed these topics while I was sitting in the library after that did some R&D on Spotify music downloaders. Then left for vetal tekdi with Bhavesh, came home late.

Good news I have completed my MCA got the results today.

Read The Gene only one chapter. The chapter was good about Ronald Fisher(Blind mathematician) and Theodosius Dobzhansky(Ukrainian scientist in America).

Conclusion : The day was Good.

Good Night.

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