This N10-009 practice question tests your understanding of networking concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 of the following is a characteristic of a connectionless protocol at the transport layer?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It does not require a virtual circuit
Connectionless protocols at the transport layer, such as UDP (User Datagram Protocol), do not establish a virtual circuit or session before sending data. Each datagram is sent independently without prior coordination, making the protocol stateless and reducing overhead. This characteristic is fundamental to UDP's design, as defined in RFC 768.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
It establishes a session before sending data
Why it's wrong here
Establishing a session is a characteristic of connection-oriented protocols like TCP.
✗
It guarantees delivery using acknowledgments
Why it's wrong here
Acknowledgments and guaranteed delivery are features of reliable, connection-oriented protocols.
✓
It does not require a virtual circuit
Why this is correct
Connectionless protocols send data independently without setting up a virtual circuit or logical connection.
Related concept
Read the scenario before looking for a memorised answer.
✗
It retransmits lost segments
Why it's wrong here
Retransmission of lost segments is performed by reliable protocols like TCP, not connectionless protocols.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'connectionless' at the transport layer with 'connectionless' at the network layer (IP), leading them to think that IP's lack of virtual circuits applies to all layers, but the question specifically targets transport-layer behavior where UDP is the key example.
Detailed technical explanation
How to think about this question
Under the hood, a connectionless transport protocol like UDP encapsulates data into datagrams with a minimal 8-byte header containing source and destination ports, length, and a checksum. The sender does not maintain any state about the receiver, and the receiver does not send acknowledgments; this allows for low-latency, best-effort delivery ideal for real-time applications like VoIP or DNS queries. A subtle behavior is that UDP checksum is optional in IPv4 but mandatory in IPv6, yet even with checksums, no retransmission occurs on corruption.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Networking Concepts — This question tests Networking Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It does not require a virtual circuit — Connectionless protocols at the transport layer, such as UDP (User Datagram Protocol), do not establish a virtual circuit or session before sending data. Each datagram is sent independently without prior coordination, making the protocol stateless and reducing overhead. This characteristic is fundamental to UDP's design, as defined in RFC 768.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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