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An engineer is reviewing transport protocols for a new application. Which two characteristics are associated with TCP rather than UDP?

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An engineer is reviewing transport protocols for a new application. Which two characteristics are associated with TCP rather than UDP?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Best answer

Connection establishment before data transfer

TCP uses a session setup process before exchanging application data.

B

Distractor review

Best-effort delivery with no acknowledgments

That aligns more closely with UDP behavior.

C

Best answer

Sequencing and retransmission support

TCP provides reliability mechanisms such as sequence numbers and retransmissions.

D

Distractor review

Lower overhead because no session state is tracked

That is more typical of UDP.

Common exam trap

Common exam trap: answer the scenario, not the keyword

A frequent exam trap is assuming that UDP provides connection establishment or sequencing like TCP. Because UDP is simpler and faster, some candidates mistakenly attribute TCP’s reliability features to UDP. This confusion often leads to selecting incorrect answers that describe TCP behaviors but are labeled as UDP characteristics. Remember, UDP does not establish sessions, does not guarantee delivery, and does not perform retransmissions or sequencing. Misunderstanding these fundamental differences can cause errors in both exam scenarios and practical Cisco network troubleshooting.

Technical deep dive

How to think about this question

Transmission Control Protocol (TCP) is a connection-oriented transport layer protocol that ensures reliable data delivery between devices. It achieves this by establishing a session through a three-way handshake before any data is sent. TCP assigns sequence numbers to each byte of data and requires acknowledgments from the receiver, enabling ordered delivery and detection of lost or corrupted segments. This mechanism is fundamental in Cisco networking environments where reliable communication is critical for protocols like HTTP, FTP, and SSH. The decision process for using TCP over UDP involves evaluating the need for reliability versus speed and overhead. TCP’s connection establishment and retransmission features guarantee data integrity but introduce latency and resource consumption. UDP, by contrast, is connectionless and does not track session state, making it suitable for applications like DNS or streaming where speed is prioritized over reliability. Cisco network engineers must understand these trade-offs to optimize network performance and application behavior. A common exam trap is confusing UDP’s best-effort delivery with TCP’s reliable transmission. Candidates may incorrectly associate features like sequencing or connection establishment with UDP, which lacks these capabilities. In practical Cisco networks, TCP’s overhead is justified for critical data exchanges, while UDP’s minimal overhead benefits real-time or multicast traffic. Recognizing these distinctions helps avoid misconfigurations and supports effective protocol selection during the CCNA exam and real-world deployments.

KKey Concepts to Remember

  • TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices.
  • TCP uses sequence numbers and acknowledgments to provide reliable, ordered delivery of data segments across a network.
  • UDP operates without connection establishment, providing best-effort delivery without guarantees of packet order or retransmission.
  • TCP retransmits lost or corrupted segments based on acknowledgments and timeout mechanisms to ensure data integrity.
  • UDP has lower overhead than TCP because it does not maintain session state or perform error recovery.
  • In Cisco networking, TCP is preferred for applications requiring reliability, such as HTTP, FTP, and SSH, due to its connection-oriented nature.
  • Understanding the differences between TCP and UDP is critical for selecting appropriate transport protocols in network design and troubleshooting.
  • TCP’s connection-oriented features increase overhead but provide flow control and congestion management, which UDP lacks.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?

Question 2

A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?

Question 3

What is the OSPF metric called?

Question 4

A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?

Question 5

A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?

Question 6

A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?

FAQ

Questions learners often ask

What does this 200-301 question test?

TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices.

What is the correct answer to this question?

The correct answer is: Connection establishment before data transfer — TCP is connection-oriented and provides reliability with sequence numbers, acknowledgments, and retransmissions. UDP is lighter but does not guarantee delivery.

What should I do if I get this 200-301 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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