Quick Answer
The answer is sequencing and retransmission support. These two characteristics are associated with TCP rather than UDP because TCP is a connection-oriented protocol that guarantees reliable data delivery through sequence numbers, which reorder out-of-order segments, and retransmissions, which resend lost packets after acknowledgments time out. In contrast, UDP is connectionless and provides no such reliability mechanisms, making it faster but prone to data loss. On the CCNA 200-301 v2 exam, this distinction tests your understanding of transport layer responsibilities, often appearing in questions that ask you to match protocol features or choose the right protocol for an application like VoIP versus file transfer. A common trap is confusing flow control or windowing with sequencing—remember that sequencing is specifically about ordering, not pacing. For a quick memory tip, think of TCP as a meticulous librarian who numbers and rechecks every book, while UDP is a fast courier who tosses packages and hopes they arrive.
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: tCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer is reviewing transport protocols for a new application. Which two characteristics are associated with TCP rather than UDP?
Connection establishment before data transfer
TCP uses a session setup process before exchanging application data.
Best-effort delivery with no acknowledgments
Why wrong: That aligns more closely with UDP behavior.
Sequencing and retransmission support
TCP provides reliability mechanisms such as sequence numbers and retransmissions.
Lower overhead because no session state is tracked
Why wrong: That is more typical of UDP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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.
Key principle: TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
Don't confuse reliability with speed; TCP's reliability features add overhead, making it slower than UDP.
Detailed technical explanation
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.
Key takeaway
TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices.
Real-world example
A practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Review tCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices..
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.
Review tCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices., then practise related 200-301 questions on the same topic to reinforce the concept.
TCP establishes a connection before data transfer by using a three-way handshake to ensure reliable communication between devices.
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Last reviewed: May 17, 2026
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