The answer is that a network switch forwards data based on MAC addresses. This is correct because a switch operates at Layer 2 of the OSI model, where it reads the destination MAC address in each incoming frame and consults its Content Addressable Memory (CAM) table to forward the frame only to the specific port connected to that device. On the CompTIA ITF+ FC0-U61 exam, this question tests your understanding of how switches differ from hubs and routers; a common trap is confusing switches with routers, which forward data based on IP addresses. Remember that switches create separate collision domains and use MAC addresses to make intelligent forwarding decisions, unlike hubs that broadcast to all ports. A helpful memory tip is to think “Switch = MAC, Router = IP” to keep the layers straight.
FC0-U61 Infrastructure Practice Question
This FC0-U61 practice question tests your understanding of infrastructure. 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 TWO are characteristics of a network switch? (Select exactly two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Operates at Layer 2 of the OSI model
A network switch operates at Layer 2 (Data Link Layer) of the OSI model, where it uses MAC addresses to make forwarding decisions. Unlike hubs, switches learn and store MAC addresses in a Content Addressable Memory (CAM) table, allowing them to forward frames only to the specific port associated with the destination MAC address, which reduces collision domains and improves network efficiency.
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.
✓
Operates at Layer 2 of the OSI model
Why this is correct
Switches work at the Data Link layer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Forwards data based on MAC addresses
Why this is correct
Switches use MAC addresses to forward frames within a network.
Related concept
Read the scenario before looking for a memorised answer.
✗
Operates at Layer 3
Why it's wrong here
Layer 3 operation is typical of routers.
✗
Connects different networks
Why it's wrong here
Switches connect devices within the same network; routers connect different networks.
✗
Forwards data based on IP addresses
Why it's wrong here
IP forwarding is done by routers, not switches.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a switch's ability to perform some Layer 3 functions (like in a multilayer switch) with the standard definition of a switch, leading them to incorrectly select Layer 3 options when the question explicitly asks for characteristics of a 'network switch' in the context of the CompTIA FC0-U61 exam.
Detailed technical explanation
How to think about this question
Under the hood, a switch builds its MAC address table by examining the source MAC address of every incoming frame and associating it with the ingress port; when a frame arrives with an unknown destination MAC, the switch floods it out all ports except the ingress port (unknown unicast flooding). In real-world scenarios, this behavior is critical for Spanning Tree Protocol (STP) operation, which prevents loops by blocking redundant paths, and for VLAN segmentation where switches use 802.1Q tags to isolate traffic at Layer 2.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Operates at Layer 2 of the OSI model — A network switch operates at Layer 2 (Data Link Layer) of the OSI model, where it uses MAC addresses to make forwarding decisions. Unlike hubs, switches learn and store MAC addresses in a Content Addressable Memory (CAM) table, allowing them to forward frames only to the specific port associated with the destination MAC address, which reduces collision domains and improves network efficiency.
What should I do if I get this FC0-U61 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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This FC0-U61 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 FC0-U61 exam.
Question Discussion
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