How do TCP and UDP differ in the way they guarantee packet delivery?
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A. B. C. D.C.
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both transport layer protocols that provide a means of communication between applications running on different devices.
TCP is a connection-oriented protocol, which means it establishes a connection between two devices before transmitting data. It provides reliable data transfer, which means it guarantees that data is delivered without errors, duplication, or loss.
To guarantee packet delivery, TCP uses a combination of retransmissions, acknowledgment, and checksums. When a device sends data over TCP, it waits for an acknowledgment from the receiving device to confirm that the data has been received. If the acknowledgment is not received within a specified time, the sender will retransmit the data. This process continues until the data is acknowledged.
In addition to retransmissions and acknowledgment, TCP also uses checksums to ensure that the data is transmitted without errors. A checksum is a mathematical calculation that detects errors in the data. TCP calculates a checksum for each segment of data that is sent, and the receiving device verifies the checksum to ensure that the data has not been corrupted during transmission.
On the other hand, UDP is a connectionless protocol that does not establish a connection before transmitting data. It provides unreliable data transfer, which means it does not guarantee that data is delivered without errors, duplication, or loss.
To detect errors in the data, UDP uses a checksum. A checksum is a mathematical calculation that detects errors in the data. UDP calculates a checksum for each datagram that is sent, and the receiving device verifies the checksum to ensure that the data has not been corrupted during transmission.
UDP does not provide retransmissions or acknowledgment. If a datagram is lost during transmission, it will not be retransmitted, and the receiving device will not send an acknowledgment.
In conclusion, option C is the correct answer to the question. TCP guarantees packet delivery through a combination of retransmissions, acknowledgment, and checksums, while UDP only uses checksums to detect errors in the data.