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Table of contents
Data Communication
Types of Data Communication
1.) Connection-Oriented
2.) Connectionless 
Difference between Connection-Oriented and Connection-less Services
Key Takeaways
Last Updated: Mar 27, 2024

Connection-Oriented vs Connectionless Services in Android

Author Vivek Goswami
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Can you count the number of times you communicated before reading this blog? 

So, what was the count? Well, that would be endless. Communication forms an integral part of our lives. It is impossible to live without it. However, here in this blog, we shall discuss data communication, its various types, and what we mean by it. So let's get on with it and understand the topic in detail. 

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Data Communication

Data communication is a communication network for sending and receiving data between two or more computers over the same network or different networks. There are two ways of establishing data communication from one device to another, connection-oriented and connectionless. Both connected and connectionless services are used to establish connections between two or more devices. The network layer provides these types of services. 

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Types of Data Communication

There are two types of Data Communication services. They are categorized primarily in the following two types:

  1. Connection-Oriented Data Communication System
  2. Connectionless  System

Now let us start learning more about these two:

1.) Connection-Oriented

Connection-oriented services include establishing and terminating connections to send data between two or more devices. Connection-oriented services are related to the telephone system. These services use handshake procedures to establish a connection between the sender and the receiver.

Connection-oriented services are network services designed and developed after the telephone system. We use connection-oriented services to establish an end-to-end connection between a sender and a receiver before sending the data on the same or different networks. In connection-oriented services, we send packets to the recipient in the same order the sender has transmitted them. It transfers data over the network using a handshake procedure that establishes a connection between the user and the sender. Therefore, it is also called a reliable network service.

Suppose the sender wants to send data to the recipient. The sender first sends the request packet to the receiver in an SYN packet. The receiver then responds to the sender's request with an (SYNACK) signal/packet, which means that the recipient receives the confirmation and initiates communication between the sender and the recipient. The sender can now send the message or data to the recipient.

Similarly, the recipient can reply or send the data in a packet to the sender. After a successful exchange or transmission of data, the sender can terminate the connection by sending a signal to the recipient. In this way,  it is a reliable network service.

2.) Connectionless 

In contrast, connectionless services do not require you to establish a connection and termination process to send data over the network. Connectionless services are related to the postal system. A significant advantage of connectionless services is that they do not include connection setup and disconnection. However, this comes at the cost of the disadvantage of having an unreliable system.  

Packets do not follow the same path to reach their destination as in the instance of connection-oriented systems. We can lose data in these types of services due to congestion during transmission.

A sender can send data without forming a connection link since it is a connectionless type of data service. Data that is sent by the sender will be in the form of packets that has the receiver's address. However, due to congestion in the network, these data packets may get lost during transmission. The receiver also receives the data packets in an orderly manner. 

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Difference between Connection-Oriented and Connection-less Services

So far, we have developed a basic understanding of the connection-oriented and connectionless system. Some differences, as you might have noticed, are explicit. So, let us move on and draw a list of several differentiating factors between the two types of systems.

  1. Relation: Connection-Oriented services can be recognized as similar to telephone system connections, whereas connection-less services are identical to postal systems.
  2. Compulsion Level: Connection-Oriented services are necessary. However, connection-less services are not essential. 
  3. Suitability for use: Connection-Oriented Systems find their use primarily in long and steady communication. In contrast,  we can use connectionless services more appropriately for bursty services.
  4. Feasibility: Connection-Oriented services are feasible. However, connection-less services are not viable.
  5. Congestion: Congestion isn’t a significant factor of consideration in the connection-oriented system. In connectionless systems, congestion is possible.
  6. Reliability: Connection-oriented systems are highly reliable. Connectionless Systems are not reliable.
  7. Route of travel: In a connectionless system same route of travel is followed by every packet, whereas in connectionless services, the same route is not followed by every packet.
  8. Bandwidth Required: Connection-oriented services require high bandwidth, whereas connectionless services do not require high bandwidth.


  1. Which out of connectionless and connectionless provides faster service?
    Ans: Before sending the packet, the virtual circuit is created with the connection-oriented protocol. This adds delay and slows down the connection speed compared to connection-less protocol services.
  2. Why is the Internet mainly connection-less?
    Ans: Most of the traffic on the Internet is connectionless because this approach makes it easy to manage certain types of traffic without incurring data transfer service charges.
  3. Why might an organization choose a connection-oriented service over a connectionless one?
    Ans: Connection-oriented services are more reliable than connectionless services. We may send messages in a connection-oriented service if there is an error on the receiver’s part.

Key Takeaways

In this article, we have extensively discussed and developed an understanding of data communication services. As we saw, data communication services can be of two types: connection-oriented data communication services and connectionless services. We looked into the details of the two types of services and then listed the differences.

We hope this blog has helped you enhance your knowledge regarding the differences between connectionless and connection-oriented communication.

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