Quick Answer
The answer is one-to-one communication. A unicast transmission involves a single source sending data packets to a single destination, which is the fundamental method for most client-server interactions, such as a host sending an HTTP request to a web server. In Ethernet frames, the destination MAC address is the unique address of the target device, ensuring only that device processes the frame, unlike broadcasts or multicasts. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of basic IPv4 addressing and frame delivery, often appearing in questions that contrast unicast with broadcast or multicast traffic. A common trap is confusing unicast with multicast, but remember that unicast is strictly one sender to one receiver, while multicast is one-to-many. A helpful memory tip: think of a private conversation between two people—that’s unicast, as opposed to a public announcement.
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 describes a unicast transmission?
One-to-one communication
Unicast delivers data to a single destination host.
One-to-many communication
Why wrong: This describes multicast transmission.
One-to-all communication
Why wrong: This describes broadcast transmission.
Many-to-many communication
Why wrong: This is not a standard network transmission type; anycast is one-to-one-of-many.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
One-to-one communication
Unicast transmission is defined as one-to-one communication where a single source sends data to a single destination. In IPv4 networking, this is the standard method for most client-server interactions, such as a host sending an HTTP request to a web server. The destination MAC address in the Ethernet frame is the unique address of the target device, ensuring only that device processes the frame.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
One-to-one communication
Why this is correct
Unicast delivers data to a single destination host.
Related concept
Read the scenario before looking for a memorised answer.
One-to-many communication
Why it's wrong here
This describes multicast transmission.
One-to-all communication
Why it's wrong here
This describes broadcast transmission.
Many-to-many communication
Why it's wrong here
This is not a standard network transmission type; anycast is one-to-one-of-many.
Common exam traps
The trap here is that candidates often confuse unicast with multicast because both involve a single source, but they forget that unicast is strictly one-to-one, while multicast is one-to-many to a subscribed group.
Detailed technical explanation
Unicast relies on the Address Resolution Protocol (ARP) to map a destination IP address to its corresponding MAC address before the frame is sent. In switched Ethernet, the switch learns the MAC address of each port and forwards unicast frames only to the specific port where the destination device resides, preserving bandwidth. This is in contrast to broadcast frames, which are flooded to all ports except the ingress port, and multicast frames, which are forwarded only to ports that have joined the multicast group via IGMP snooping.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Networking Concepts — This question tests Networking Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: One-to-one communication — Unicast transmission is defined as one-to-one communication where a single source sends data to a single destination. In IPv4 networking, this is the standard method for most client-server interactions, such as a host sending an HTTP request to a web server. The destination MAC address in the Ethernet frame is the unique address of the target device, ensuring only that device processes the frame.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This N10-009 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the N10-009 exam.
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