Exam N10-008 topic 1 question 489 discussion

The hub is half duplex, which would stop the network from being full duplex.

Duplex Mismatch is what causes the issue and Flow Control is what can fix the issue. I will go with A. IMHO Yes hubs work with Half Duplex and Switch is Full. You cant make a hub work in full duplex there is no setting on it. Hubs are notorious about these broadcast storms linked to being half duplex devices and the fix for it is Flow control. The Core reason is hub being half duplex alternative is the Flow Control might have failed. I will go for the MAIN reason

The answer is A. Duplex mismatch. Duplex mismatch occurs when two devices on the same network are configured for different duplex modes, such as full duplex and half duplex. This can cause a number of problems, including slow performance, packet loss, and collisions. In this case, the customer added a hub between the switch and the router. Hubs are typically half duplex devices, while switches can be either full duplex or half duplex. If the switch is configured for full duplex and the hub is configured for half duplex, then this will cause a duplex mismatch. This will slow down the network traffic and may cause other problems as well. The other options are not as likely to be the cause of the issue.

All hubs is half duplex. Switches are full duplex. Hubs create broadcast storms on all ethernet ports which floods the network with unnecessary traffic.

WTF...who would use a hub?

Based on the CompTIA Network+ certification, the most likely cause of the network issue described in the scenario would be: C. STP malfunction The Spanning Tree Protocol (STP) is a network protocol that helps prevent loops in a network by managing redundant paths. Adding a hub between the switch and the router could introduce a loop in the network topology. If the STP is not properly configured or if there is a malfunction, it can lead to network congestion, performance degradation, and slow speeds for the other network components connected to the switch. Therefore, according to the CompTIA Network+ knowledge, option C (STP malfunction) is the most likely cause of the issue in the given scenario. What do you think about this ?

Who sets these kind of questions!!! Probably they expect something about duplex. So, I will go for duplex mismatch. Although this is not exactly a mismatch, but a collision avoidance that causes the issue

It's gotta be B because a hub cannot have a duplex config.

Chatgpt leans towards B, Flow Control Failure. "Yes, there are scenarios where Option A, "Duplex mismatch," could be a better answer. Duplex mismatch occurs when two devices are connected with mismatched duplex settings. For example, if a switch is set to full duplex and the hub is set to half-duplex, it can cause communication errors and network congestion. In the case of this scenario, the addition of the hub may have caused a duplex mismatch with the switch, causing a decrease in network performance. Overall, both flow control failure and duplex mismatch are potential issues that can occur when connecting a hub to the network as reported in the scenario. However, given that the hub is a passive device and unlikely to support any type of flow control, flow control failure is the more likely cause of the issue in this scenario."