Which two problems occur when increasing numbers of users are added to an Ethernet LAN with no switches present? (Choose two.)
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A. B. C. D.AD
When an Ethernet LAN is without switches, it is a basic network design that is referred to as a "hub and spoke" topology. All devices on the LAN are connected to a central hub, which is typically a multi-port repeater, and each device sends its data to every other device on the network.
As the number of devices on the LAN increases, two problems can arise:
Greater chance for collisions: In a hub and spoke topology, all devices share the same network segment, and they contend for the same bandwidth. As more devices are added to the network, the chance of two devices transmitting at the same time increases, leading to collisions. When a collision occurs, both devices must retransmit their data, leading to a decrease in network performance and an increase in latency.
Some devices will not see certain traffic: In a hub and spoke topology, when a device sends data, it is broadcast to all devices on the network. However, some devices may not be interested in that data, so they will ignore it. As more devices are added to the network, the amount of broadcast traffic increases, leading to unnecessary consumption of network bandwidth. Additionally, some devices may not be able to receive certain types of traffic, such as multicast or broadcast traffic, which can lead to communication issues.
Answer A: There is a greater chance for collisions to occur, is correct, as explained above.
Answer B: The MAC table sizes increase is incorrect in this scenario, as hubs don't have MAC tables, they simply forward every incoming frame out to all other devices on the network segment.
Answer C: Some devices will not see certain traffic is partially correct, as some devices may not be able to receive certain types of traffic, such as multicast or broadcast traffic, which can lead to communication issues. However, all devices will still receive all frames sent on the shared network segment.
Answer D: There is unnecessary consumption of network bandwidth is correct, as explained above.
Therefore, the correct answers are A and D.