Understanding Ethernet Collision Domains | JN0-102 Exam Study Guide
Question
Which two statements are true regarding an Ethernet collision domain? (Choose two.)
Answers
Explanations
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A. B. C. D.AC
An Ethernet collision domain refers to a network segment where data packets can collide with one another. This usually occurs when two or more devices try to transmit data simultaneously over the same network segment.
Regarding the statements provided in the question:
A. If a switch is used, the collision domain is limited to each device and the switch. This statement is true. When a switch is used, it creates a separate collision domain for each device connected to it. This is because the switch buffers and forwards packets only to the intended recipient, and not to all the devices connected to it. As a result, collisions are limited to each device and the switch, which improves network performance and reduces network congestion.
B. If a hub is used, the collision domain is limited to each device and the hub. This statement is false. When a hub is used, it creates a single collision domain for all the devices connected to it. This is because the hub broadcasts all incoming packets to all the devices connected to it. As a result, collisions can occur between any two devices connected to the hub, which can lead to network congestion and poor performance.
C. If a hub is used, the collision domain includes all devices connected to the hub. This statement is true. As explained above, when a hub is used, all the devices connected to it share the same collision domain, and collisions can occur between any two devices.
D. If a switch is used, the collision domain includes all devices connected to the switch. This statement is false. When a switch is used, each device connected to it has its own collision domain, as explained in statement A. Therefore, collisions are limited to each device and the switch, and do not affect other devices connected to the switch.
In summary, statements A and C are true regarding an Ethernet collision domain. When a switch is used, collisions are limited to each device and the switch, while when a hub is used, all devices connected to it share the same collision domain.
