21.what is the difference between udp and tcp

Its view of data is that of discrete datagrams, or messages, with no guarantee that these messages actually reach their recipient, or that they arrive in the order they were sent. It does guarantee that if a message arrives, it arrives in its entirety and without modification. From implementation point of view, see this question. For short answer: TCP works kind of like registered letter when UDP is kind of like ordinary letter - with the latter you never know whether the recipient got the packet you sent.

There are loads of helpful comparisons. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What do you use them for? Ask Question. Asked 10 years, 9 months ago. Active 10 years, 9 months ago. Viewed 9k times. So what are they? What are they for? Kimvais This process is called encapsulation.

There are different methods of encapsulation depending on which protocol and topology are being used. As a result, the frame structure of these packets differ as well. The payload field contains the actually data. Notice that TCP has a more complex frame structure. This is largely due to the fact the TCP is a connection-oriented protocol. The extra fields are need to ensure the "guaranteed delivery" offered by TCP.

Powered by GitBook. When a file or message send it will get delivered unless connections fails. If connection lost, the server will request the lost part. Transmission Control Protocol TCP is a connection-oriented protocol that computers use to communicate over the internet.

TCP provides error-checking and guarantees delivery of data and that packets will be delivered in the order they were sent. User Datagram Protocol UDP is a connectionless protocol that works just like TCP but assumes that error-checking and recovery services are not required. Instead, UDP continuously sends datagrams to the recipient whether they receive them or not. They are the most commonly used protocols for sending packets over the internet.

TCP establishes a connection between a sender and receiver before data can be sent. UDP does not establish a connection before sending data. UDP is unreliable, it does not provide guaranteed delivery and a datagram packet may become corrupt or lost in transit. TCP uses a flow control mechanism that ensures a sender is not overwhelming a receiver by sending too many packets at once. TCP stores data in a send buffer and receives data in a receive buffer.

When an application is ready, it will read the data from the receive buffer. If the receive buffer is full, the receiver would not be able to handle more data and would drop it. To maintain the amount of data that can be sent to a receiver, the receiver tells the sender how much spare room in the receive buffer there is receive window.

Every time a packet is received, a message is sent to the sender with the value of the current receive window. UDP does not provide flow control. With UDP, packets arrive in a continuous stream or they are dropped. TCP does ordering and sequencing to guarantee that packets sent from a server will be delivered to the client in the same order they were sent.

On the other hand, UDP sends packets in any order. TCP has to establish a connection, error-check, and guarantee that files are received in the order they were sent. TCP is best suited to be used for applications that require high reliability where timing is less of a concern. UDP is best suited for applications that require speed and efficiency. Transport Layer Protocol is layer 4 end-end protocol. One example of this is the checksum provided in the header. Unlike the checksum provided in Layer 2 and Layer 3 , if you look closely you will observe that this checksum verifies data integrity between the two end hosts.

So that no errors were introduced by the routers or switches in the path. But TCP offers soooo much more! Windows 11 SE Explained. Windows 11 SE. Microsoft Default Browser Firefox. Google's New Pet Art. Robinhood Hack Find Downloaded Files on an iPhone. Use Your iPhone as a Webcam. Hide Private Photos on iPhone. Take Screenshot by Tapping Back of iPhone. Should You Upgrade to Windows 11? Browse All Windows Articles. Copy and Paste Between Android and Windows.

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