CCNA: Cisco Certified Network Associate — Question 1255

How do TCP and UDP fit into a query-responsible model?

Answer options

• A. TCP avoids using sequencing and UDP avoids using acknowledgments
• B. TCP establishes a connection prior to sending data, and UDP sends immediately
• C. TCP encourages out-of-order packet delivery, and UDP prevents re-ordering
• D. TCP uses error detection for packets, and UDP uses error recovery.

Correct answer: B

Explanation

The correct answer is B because TCP requires a connection to be established before any data is sent, ensuring a reliable communication channel, while UDP sends data immediately without establishing a connection. Options A, C, and D are incorrect because they misrepresent the characteristics of TCP and UDP, particularly regarding sequencing, packet delivery order, and error handling mechanisms.