BFE.devでのAI解答例 - フロントエンド面接質問
172. What is the difference between TCP and UDP?
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both transport layer protocols used in computer networks. However, they differ in several key aspects:
Connection-oriented vs Connectionless: TCP is a connection-oriented protocol, which means it establishes a reliable connection between the sender and receiver before data transmission. UDP, on the other hand, is a connectionless protocol, meaning it does not establish a connection and does not guarantee reliable delivery.
Reliability: TCP is reliable as it ensures that all packets are delivered in the correct order and without errors. It uses acknowledgments and retransmissions to achieve this reliability. UDP, on the other hand, does not guarantee reliability and may result in lost or out-of-order packets.
Speed: UDP is faster than TCP due to its connectionless nature and lack of error-checking mechanisms. TCP's reliability features, such as acknowledgment and retransmission, add overhead and may result in slower transmission speeds.
Ordering: TCP guarantees in-order delivery of packets. If packets arrive out of order, TCP reorders them before delivering to the application layer. UDP does not provide any ordering guarantees, meaning that packets may arrive out of order.
Usage: TCP is commonly used for applications that require reliable and ordered delivery of data, such as browsing the web, file transfers, or email communication. UDP is often used for real-time applications, such as video streaming, voice-over-IP (VoIP), online gaming, where reliability and ordering are less important compared to speed.
In summary, TCP provides reliability and ordered delivery at the cost of speed, while UDP sacrifices reliability for speed and is more suitable for real-time applications.