Difference between Connection-oriented protocols vs Connectionless Protocols

If we talk about both protocols then both works for making 
connection between two or more devices. This service offered in
Network Layer. Sending and receiving data includes connection
establishment and termination. And there comes these protocols.
Where we can go for connection oriented or connectionless
depending on service.

Connection-oriented Protocols

This connection protocol ensures that there will be a 
connection before sending or receiving the data. It is
basically a handshake method for connection between sender and
receiver. The popular example of this is TCP (Transmission
Control Protocol) which uses three-way handshake to establish a
connection.
Let’s say if a sender wants to send a packet to receiver. Then 
first sender will send a SYN packet and then receiver will send
a SYN-ACK packet as in responding. And then initiator will send
the last packet to make the connection successful. Now Sender
can send the data.

Once the data has been exchanged then sender will send the
signal for termination.

TCP is basically used to exchange the data. Examples are HTTP,
FTP, Telnet etc. TCP is basically send the data in ordered data
transfer and resend the lost packets which lost during the
data exchange.

Connectionless Protocols

Connectionless as named you don’t need to make a connection 
before sending the data. You can’t rely on connectionless
protocols for data transfer as it transmit the data in any
order and not ensure you for transferring the data. It has
lower overhead as compared to above one. It is because when
two parties make a connection then it uses some resources to
manage that. But here there is no such case. There can be
errors, duplication or loss of data during the data exchange.
UDP (User Datagram Protocol) is a connectionless protocol.

It is basically used for application as broadcasting, DNS,
DHCP, realtime application etc.

4 thoughts on “Difference between Connection-oriented protocols vs Connectionless Protocols

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