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200-301 · Question #198

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

The correct answer is C. TCP is reliable and is a connection-oriented protocol; UDP is not reliable and is a connectionless. TCP is a reliable, connection-oriented protocol, ensuring ordered delivery and error checking, while UDP is an unreliable, connectionless protocol that offers faster, best-effort delivery.

Submitted by khalil_dz· Mar 5, 2026Network Fundamentals

Question

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

Options

  • ATCP is reliable and is a connectionless protocol; UDP is not reliable and is a connection-oriented
  • BTCP is not reliable and is a connectionless protocol; UDP is reliable and is a connection-oriented
  • CTCP is reliable and is a connection-oriented protocol; UDP is not reliable and is a connectionless
  • DTCP is not reliable and is a connection-oriented protocol; UDP is reliable and is a connectionless

How the community answered

(50 responses)
  • A
    2% (1)
  • C
    94% (47)
  • D
    4% (2)

Why each option

TCP is a reliable, connection-oriented protocol, ensuring ordered delivery and error checking, while UDP is an unreliable, connectionless protocol that offers faster, best-effort delivery.

ATCP is reliable and is a connectionless protocol; UDP is not reliable and is a connection-oriented

TCP is connection-oriented, not connectionless; UDP is connectionless, not connection-oriented.

BTCP is not reliable and is a connectionless protocol; UDP is reliable and is a connection-oriented

TCP is reliable, not unreliable; UDP is unreliable, not reliable.

CTCP is reliable and is a connection-oriented protocol; UDP is not reliable and is a connectionlessCorrect

TCP (Transmission Control Protocol) is a connection-oriented protocol because it establishes a three-way handshake before data transfer and tears down the connection afterward, and it is reliable because it uses acknowledgments, sequence numbers, and retransmissions to guarantee data delivery and order. UDP (User Datagram Protocol), on the other hand, is a connectionless protocol as it sends packets without establishing a prior connection, and it is unreliable because it does not provide mechanisms for guaranteed delivery, ordering, or error recovery.

DTCP is not reliable and is a connection-oriented protocol; UDP is reliable and is a connectionless

TCP is reliable, not unreliable; UDP is unreliable, not reliable.

Concept tested: TCP vs UDP characteristics (reliability, connection-oriented)

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/xe-16/iap-xe-16-book/iap-tcp-udp-app-config.html

Topics

#TCP#UDP#connection-oriented#reliable transport

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