Cisco 100-105 Free Exam Question 3

Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required?

Options

A. HTTP
B. UDP
C. IP
D. TCP
E. Telnet

Answer: B
Explanation:  
UDP provides a connection less datagram service that offers best-effort delivery, which means that UDP does not guarantee delivery or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services.
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