The answer is that UDP has lower overhead because it uses a simpler header and no session establishment. This is correct because UDP is a connectionless transport protocol that skips the three-way handshake and reliability mechanisms inherent to TCP, resulting in a fixed 8-byte header compared to TCP’s 20-byte minimum. On the CCNA 200-301 v2 exam, this distinction tests your understanding of transport layer trade-offs, often appearing in questions that ask you to identify which protocol is better suited for real-time applications like VoIP or DNS queries. A common trap is assuming UDP guarantees delivery because it is used by DNS, but standard DNS queries rely on UDP’s speed and accept occasional loss. For a quick memory tip, think “UDP: Unreliable, Direct, and Plain” — no handshake, no acknowledgment, just raw speed.
CCNA Network Infrastructure and Connectivity Practice Question
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: uDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.. 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.
Which two statements accurately describe UDP compared with TCP?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
UDP is connectionless.
UDP is designed for simplicity and speed rather than built-in reliability. In plain terms, it sends data without creating a formal conversation first. That is why it is called connectionless. Because it does not perform the same reliability features as TCP, its header is smaller and the protocol adds less overhead. This makes UDP a good fit for applications that care more about speed or low delay than guaranteed delivery at the transport layer.
UDP does not perform a three-way handshake, and it does not guarantee delivery. It is also used by many real services, including DNS in common query scenarios.
Key principle: UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
UDP is connectionless.
Why this is correct
This is correct because UDP does not establish a connection before sending data.
Related concept
UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.
✗
UDP always guarantees delivery and sequencing.
Why it's wrong here
This is wrong because guaranteed delivery and sequencing are TCP features, not UDP features.
When this WOULD be correct
In a question focused on the characteristics of a reliable transport protocol, such as 'Which protocol guarantees delivery and sequencing of packets?' the correct answer would be B, as it would accurately describe TCP's features.
✓
UDP has lower overhead because it uses a simpler header and no session establishment.
Why this is correct
This is correct because UDP uses a simpler header and avoids connection-establishment overhead.
Related concept
UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.
✗
UDP requires a three-way handshake before application data can be sent.
Why it's wrong here
This is wrong because the three-way handshake belongs to TCP.
When this WOULD be correct
If the exam question asked about a protocol that does require a connection establishment, such as TCP, or if it specifically inquired about the differences in connection-oriented versus connectionless protocols, then this option would be correct.
✗
UDP cannot be used by DNS.
Why it's wrong here
This is wrong because DNS commonly uses UDP for standard queries and responses.
When this WOULD be correct
If the exam question stated that UDP cannot be used for certain protocols or applications, such as those requiring guaranteed delivery, then this option would be correct. For example, a question could ask which protocols are incompatible with UDP in scenarios requiring reliable communication.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓UDP is connectionless.Correct answer▾
Why this is correct
This is correct because UDP does not establish a connection before sending data.
✗UDP always guarantees delivery and sequencing.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because UDP does not guarantee delivery or sequencing; it is designed for speed and efficiency, sacrificing reliability. TCP, on the other hand, ensures that data is delivered in order and without loss.
★ When this WOULD be the correct answer
In a question focused on the characteristics of a reliable transport protocol, such as 'Which protocol guarantees delivery and sequencing of packets?' the correct answer would be B, as it would accurately describe TCP's features.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of UDP's functionality, conflating it with TCP's reliability features, which can lead to confusion about the fundamental differences between the two protocols.
✗UDP requires a three-way handshake before application data can be sent.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because UDP is a connectionless protocol that does not require a three-way handshake for data transmission, unlike TCP, which establishes a connection before sending data.
★ When this WOULD be the correct answer
If the exam question asked about a protocol that does require a connection establishment, such as TCP, or if it specifically inquired about the differences in connection-oriented versus connectionless protocols, then this option would be correct.
Why candidates choose this
Candidates may choose this option due to confusion between the connection-oriented nature of TCP and the connectionless nature of UDP, leading them to mistakenly believe that all protocols require a handshake.
✗UDP cannot be used by DNS.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because UDP is widely used by DNS for its quick query-response nature, allowing for faster resolution of domain names without the overhead of connection establishment.
★ When this WOULD be the correct answer
If the exam question stated that UDP cannot be used for certain protocols or applications, such as those requiring guaranteed delivery, then this option would be correct. For example, a question could ask which protocols are incompatible with UDP in scenarios requiring reliable communication.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of UDP's capabilities, mistakenly believing that all network services require guaranteed delivery, thus overlooking DNS's specific use of UDP.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Be careful not to confuse the connection-oriented features of TCP with UDP, which is connectionless and does not guarantee delivery.
Detailed technical explanation
How to think about this question
UDP (User Datagram Protocol) is a transport layer protocol that provides a connectionless communication model. Unlike TCP, UDP does not establish a session or connection before sending data, which means it sends packets called datagrams without prior handshaking. This design results in lower latency and overhead, making UDP suitable for applications where speed is critical and occasional data loss is acceptable, such as DNS queries, streaming, or VoIP.
The fundamental rule distinguishing UDP from TCP is that UDP does not guarantee delivery, ordering, or error recovery. TCP, by contrast, uses a three-way handshake to establish a connection and implements mechanisms for reliable delivery, sequencing, and flow control. UDP’s simpler header and lack of session establishment reduce protocol overhead, which is why UDP is considered connectionless and lightweight in Cisco networking contexts.
A common exam trap is confusing UDP’s connectionless nature with unreliability or assuming UDP cannot be used for important services. In practice, UDP is widely used for DNS and other critical applications because its speed and simplicity outweigh the lack of built-in reliability. Cisco devices and protocols often leverage UDP for efficiency, so understanding this balance is crucial for CCNA exam success and real-world network design.
KKey Concepts to Remember
UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.
UDP uses a simpler header than TCP, which reduces protocol overhead and improves transmission speed in Cisco networks.
TCP guarantees delivery, sequencing, and error recovery by establishing a connection through a three-way handshake before data transfer.
UDP does not guarantee delivery or sequencing, making it suitable for applications prioritizing speed over reliability.
DNS commonly uses UDP for standard queries because UDP’s low overhead supports fast request and response cycles.
The absence of connection establishment in UDP means it does not perform flow control or retransmission of lost packets.
Cisco devices leverage UDP for services that require minimal delay and can tolerate occasional data loss, such as streaming and VoIP.
Confusing UDP’s connectionless nature with unreliability can lead to exam mistakes; understanding the protocol’s design purpose is essential.
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.
Key takeaway
UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.
Real-world example
How this comes up in practice
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. UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review uDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission..
What is the correct answer to this question?
The correct answer is: UDP is connectionless. — UDP is designed for simplicity and speed rather than built-in reliability. In plain terms, it sends data without creating a formal conversation first. That is why it is called connectionless. Because it does not perform the same reliability features as TCP, its header is smaller and the protocol adds less overhead. This makes UDP a good fit for applications that care more about speed or low delay than guaranteed delivery at the transport layer.
UDP does not perform a three-way handshake, and it does not guarantee delivery. It is also used by many real services, including DNS in common query scenarios.
What should I do if I get this 200-301 question wrong?
Review uDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
UDP is a connectionless protocol that sends data without establishing a session or performing a handshake before transmission.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which two statements accurately compare TCP and UDP? (Choose two.)
medium
✓ A.TCP provides connection-oriented transport
B.UDP guarantees delivery through acknowledgments
✓ C.UDP has lower overhead than TCP
D.TCP does not use port numbers
E.UDP is always faster because it avoids congestion
Why A: TCP is connection-oriented and uses sequencing, acknowledgments, and related controls. UDP is simpler and has lower overhead, but it does not guarantee delivery.
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Question Discussion
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