CCNA: Cisco Certified Network Associate — Question 226

What is the difference regarding reliability and communication type between TCP and UDP?

Answer options

• A. TCP is reliable and is a connectionless protocol; UDP is not reliable and is a connection-oriented protocol.
• B. TCP is not reliable and is a connectionless protocol; UDP is reliable and is a connection-oriented protocol.
• C. TCP is not reliable and is a connection-oriented protocol; UDP is reliable and is a connectionless protocol.
• D. TCP is reliable and is a connection-oriented protocol; UDP is not reliable and is a connectionless protocol.

Correct answer: D

Explanation

The correct answer is D because TCP provides reliable, ordered, and error-checked delivery of data, operating as a connection-oriented protocol. In contrast, UDP is a connectionless protocol that does not guarantee reliability, making it suitable for applications where speed is more critical than accuracy, such as video streaming or online gaming. The other options incorrectly assign the reliability and connection types of TCP and UDP.