Without transport protocols, such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol), data that is sent through the network without regard to how the host handles the inbound data packets will be difficult to manage. This is why Transport Layer (Layer 4 on the OSI Model) is required. It acts as an interface between the lower-level Network layer (Layer 3 in the OSI Model) and the higher-level application layer (Layer 7 in the OSI Model).

What is a protocol for transport?

There are a variety of protocols within the TCP/IP suite, which include the official TCP as well as UDP protocols. In essence, the transport protocol transfers information between networks and specific ports. These ports are accessible to be used in applications that require higher levels of.


TCP is among the best widely used transport protocol used for emails, web traffic as well as file transfer applications like FTP. The primary benefits for TCP is that it :

Connectivity-oriented TCP guarantees a 2-way communication between host, even when it’s just for only one-way data flow.

Trustworthy: TCP ensures that all data is delivered to the destination host. If data doesn’t arrive, TCP will handle the mistakes and try to send it again.

Correction for errors: a TCP segment has an identifier that can be used to find differences between the segments sent and the ones received. TCP detects corrupted segments and try to resend the segments in the same way as missing segments.

Flow Control: host that is receiving can control the flow of data to avoid slower hosts getting ensnared due to a host sending data faster than it can take.

Sequencing TCP assures you that the packets are delivered to higher layers in right order even if they go across the network outside of the correct order.


While TCP is an ideal option for traffic on networks however, the additional errors and handling make the packets more hefty and increases the amount of processing required to complete the job.

UDP is basically the reverse of TCP in its behavior. It’s undependable, connectless light, speedy, and fast. The local host is able to send drawings to remote hosts. It doesn’t wait for a connection to be established or for any acknowledgement of the distant host. This is why it’s not a popular option compared to TCP however UDP is the best protocol for certain situations.

Gaming servers and streaming services provide prime instances of instances when speedy connections are crucial and when error-checking for each packet with TCP could result in more delays than a corrupt packet transmitted using UDP.

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