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Cisco 200-901 Exam - Topic 2 Question 110 Discussion

What is the function of an Ethernet switch in a networking environment?
B) to switch a frame from one port to another port based on MAC address
A) to switch a frame from one port to another port based on IP address
C) to provide IP addressing to connected hosts
D) to block unwanted traffic

Cisco 200-901 Exam - Topic 2 Question 110 Discussion

Actual exam question for Cisco's 200-901 exam
Question #: 110
Topic #: 2
[All 200-901 Questions]

What is the function of an Ethernet switch in a networking environment?

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Suggested Answer: B

An Ethernet switch operates at the Data Link layer (Layer 2) of the OSI model. Its primary function is to forward frames between devices based on their MAC (Media Access Control) addresses. When a frame arrives at the switch, the switch reads the destination MAC address and forwards the frame to the appropriate port that connects to the device with that MAC address.

MAC Address Table: Switches maintain a MAC address table that maps each MAC address to a specific port. This table is built dynamically as the switch learns the MAC addresses of devices connected to its ports.

Frame Switching: By using the MAC address table, the switch can efficiently switch frames only to the destination port, which reduces unnecessary traffic on other ports and improves network performance.


Cisco DevNet Associate Certification Guide

Cisco Ethernet Switch Operation

by Justine at Mar 31, 2026, 06:25 PM

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Lashawn
1 month ago
I feel like A is misleading. IP is for routing, not switching.
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Stephaine
2 months ago
Agreed! MAC is key for local traffic.
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Weldon
2 months ago
I think it's B. It uses MAC addresses to switch frames.
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Vesta
2 months ago
Totally agree, B is the right answer!
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Glory
2 months ago
No way, it's not for blocking traffic!
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Ilda
2 months ago
Wait, I thought they used IP addresses too?
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Meaghan
4 months ago
Definitely B, that's how switches work.
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Troy
4 months ago
It's all about MAC addresses!
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Elsa
5 months ago
I feel like the switch's main job is to direct traffic based on MAC addresses, so I’d go with B too.
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Margret
5 months ago
I’m a bit confused about the difference between MAC and IP addresses in this context. Does the switch really use MAC?
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Viva
5 months ago
I remember practicing a question like this, and I think the answer is B. It definitely has to do with MAC addresses.
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Victor
5 months ago
I think the switch uses MAC addresses, but I'm not completely sure if that's the only thing it does.
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