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TCP vs UDP - Difference between TCP and UDP

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The Internet protocol stack’s most frequently adopted technologies are TCP and UDP. Ensures that the information you provide is properly delivered. To see if a software uses TCP or UDP depends on how important correctness is compared to performance.

Let’s first understand what they represent and reflect on the subjects we will address in this blog before moving on to the distinctions between the two:

Table of Content

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What do TCP and UDP mean?

TCP is an affiliation paradigm, once one link has been created, information can be transmitted across both directions.

TCP is the best protocol for transferring data like still images because it has built-in algorithms for recognizing issues and guaranteeing that data is transferred in the order it was received.

On the other hand;

UDP is a simpler Internet protocol that operates without connections and doesn’t need error-checking or faced hardships. Data is continuously delivered to the target, whether they hear it or not; there is no cost for opening, keeping, or closing a UDP link.

Although UDP is not suitable for email, online access, or file downloads, it is frequently used for real-time communications such as broadcast or multiplex network transmission.


It is a protocol used to establish connections.It is a protocol that does not necessitate the establishment of a connection.
TCP receives data in the form of bytes streams and transmits messages to segment boundaries.UDP communications consist of packets that are sent one at a time. It also checks for integrity as it arrives.
TCP messages are transmitted from one computer to another via the internet.Because it does not rely on connections, one software can send a large number of packets to another.
TCP rearranges data packets in the given order.The UDP protocol has no predefined sequence because every packet is independent of one another.  
TCP operates at a slower rate.UDP is faster because error recovery is not performed.

TCP vs UPD: Characteristics

Characteristics of TCP

Characteristics of TCP

TCP provides the following critical features:

  • Delivery Acknowledgements
  • Once more, transmission
  • When the network is overloaded, transmission is delayed.
  • Easy Error Detection

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Characteristics of UDP

Characteristics of UDP
  • Permits the running of programmes with a high bandwidth requirement that can endure packet loss.
  • Less time spent waiting
  • It transmits a significant quantity of packets.
  • The possibility of data loss exists.
  • Minor trades are permitted ( DNS lookup)

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TCP vs UDP: Function

TCP Function

  • Using a three-way handshake, the source and destination TCP endpoints start a TCP conversation:
  • The source transmits a message to the destination with an Initial Sequence Number (ISN).
  • The Sequence Number (SN) is raised at the destination and sent back to the source.
  • Once more, raising the SN, the source transmits it to the target.
  • TCP isolates data coming from the application layer at the source. A TCP segment is created by enclosing each item of data in a header. The Sequence Number is one of the 10 required fields in the TCP header.

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UDP Function

  • Each piece of data is encapsulated in a header at the source via UDP in order to create a datagram. The header has fields for the length of the datagram, the checksum, and the source and destination ports.
  • As a connectionless protocol, UDP does not require a handshake with the destination. Each datagram is simply forwarded by the source UDP to the network layer’s IP address before moving on to the next one. The destination UDP port receives incoming datagrams and forwards them to the application layer.

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TCP vs UDP: Performance

The advantage of UDP over TCP is that its lack of ‘acknowledgment’ allows for a continuous packet stream. Because a TCP connection always acknowledges a series of packets (whether it is entirely trustworthy or not), each negative acknowledgment in which a data packet is lost must be retransmitted.

UDP, on the other hand, avoids the added overheads of TCP transport, making it more efficient in terms of bandwidth and significantly less demanding of slow networks.

TCP vs UDP: How Do They Operate?

What Are TCP Ports and How Do They Operate?

  • The mechanism for managing connections is called TCP (Transmission Control Protocol). The principles or criteria that control how information is exchanged among network equipment are known as a protocol.
  • As just a consequence of first creating a link here between receiving and sending machines, TCP is referred to as a correlation paradigm.
  • TCP ports strengthen ties prior to data transfer.

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What Are UDP Ports and How Do They Operate?

  • The User Datagram Protocol symbol is UDP.
  • A host device can send data to a destination without first establishing a connection thanks to the User Datagram Protocol Is connectionless nature.
  • UDP ports do not need a connection to be made in order to send data, in contrast to TCP ports.
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  • With no specific destination in mind, the host sends data to UDP ports in packets (small segments).
  • Then, it assumes that the receiving device will receive those packets, which is unreliable because it does not ensure that the data will be received without error.
  • As a result, data is lost and packets are not delivered to where they should be.
  • Packet loss is what’s happening here.

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TCP vs UDP: Applications

Applications for TCP

Applications for TCP

TCP are used for the following purposes:

  • It aids you in establishing a connection between various types of computers.
  • It is not dependent on the operating system.
  • There are numerous routing protocols supported.
  • It allows for inter-organizational communication.
  • It is capable of functioning independently.
  • A number of routing protocols are supported.

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Applications for UDP

Applications for UDP

UDP is used for the following purposes:

  • UDP is widely used by time-critical applications and servers that respond to brief queries from a large number of clients.
  • UDP supports both packet broadcasts and multicasting for network transmission.
  • It’s also used in DNS, VoIP, and online gaming.

TCP vs UDP: Advantages

Advantages of TCP

TCP provides the following benefits:

  • It aids you in establishing a connection between various types of computers.
  • It is not affected by the operating system.
  • It supports a wide range of routing protocols.
  • It allows for inter-organizational communication.

Advantages of UDP

UDP provides the following benefits:

  • Broadcast and multicast transmission are both possible with UDP.
  • Every UDP packet has a checksum to aid with error detection.
  • Establishing and maintaining a connection is not always required for UDP.
  • A data stream with assured delivery can be more efficient than UDP transmission.


After reviewing the distinctions between TCP and UDP, it is clear that any organization that uses virtual communications can gain significantly from UDP. UDP not only avoids the transport traps and overcrowded networks that TCP is prone to, but it also provides exceptional speed for all of your streaming requirements. Furthermore, by enabling UDP for Lifesize, organizations gain improved workflows, cheaper overhead, and fewer interruptions all around, making this pairing a true win-win.

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