200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ858

IP Connectivity

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

  • 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.
Explanation

TCP provides reliable transport by using mechanisms such as acknowledgments, retransmissions, sequencing, and window-based flow control so a sender does not overwhelm a receiver. UDP is connectionless and does not provide transport-layer reliability features such as acknowledgments or retransmission, so delivery is best-effort. Because of that, the choice describing TCP flow control and contrasting it with UDP's lack of checking is the correct one.

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