CCNA: Cisco Certified Network Associate — Question 83

How do TCP and UDP differ in the way they provide reliability for delivery of packets?

Answer options

• A. TCP does not guarantee delivery or error checking to ensure that there is no corruption of data, UDP provides message acknowledgement and retransmits data if lost.
• B. TCP provides flow control to avoid overwhelming a receiver by sending too many packets at once, UDP sends packets to the receiver in a continuous stream without checking.
• C. TCP is a connectionless protocol that does not provide reliable delivery of data; UDP is a connection-oriented protocol that uses sequencing to provide reliable delivery.
• D. TCP uses windowing to deliver packets reliably; UDP provides reliable message transfer between hosts by establishing a three-way handshake.

Correct answer: B

Explanation

The correct answer is B because TCP implements flow control to manage the pace of data transmission, while UDP does not provide such controls and sends packets in a continuous manner. Options A, C, and D are incorrect as they misrepresent the functionalities of TCP and UDP, particularly regarding their connection types and reliability mechanisms.