EXAMPLES OF NETWORK APPLICATION

Their are many apps which use networking concepts like web browser,email,skype,etc.

Fun thing is that to make these app you need to write code only for the application layer not for core network layers.

TYPES OF PARADIGMS

CLIENT-SERVER PARADIGM

server is always present on host and it always has permanent ip address

on other hand client is not on host and it has dynamic ip address

for eg HTTP & IMAP & FTP

PEER TO PEER ARCHITECTURE

They dont need servers they directly contact with each other like P2P file sharing apps

WHAT ARE SOCKETS ?

Sockets are like doors for end point systems, in any communication there are 2 sockets one is for sender & other is for reciever.

TCP vs UDP

Each type of apps have different requirements like some may accept loss of data some not , some may accept delay and some not ,etc.

According to requirement they use TCP or UDP.

But what is basic difference between TCP & UDP

TCP is far better than UDP because it provides many good features than UDP

In earlier days TCP was not secured so Transport Security Layer is applied to TCP to make it secure