7. A network administrator is trying to troubleshoot an issue with a newly installed switch that is not connecting to the network. The administrator logs on to the switch and observes collisions on the interface. Which of the following is most likely the issue?
Answer: D
Duplex mismatch is most likely the issue.
A duplex mismatch occurs when one end of a connection is set to full duplex and the other is set to half duplex, leading to collisions on the interface. This can prevent proper communication on the network and is a common cause of issues when dealing with switches.
A) Wrong speed
While a wrong speed setting can cause connectivity issues, it typically does not lead to collisions. Instead, mismatched speeds would usually result in a link being down or erratic connectivity rather than the specific problem of collisions observed in this case.
B) Jumbo frames enabled
Enabling jumbo frames can sometimes lead to performance issues or incompatibilities if the other devices on the network do not support them. However, this configuration issue would not specifically result in interface collisions, making it an unlikely cause for the problem at hand.
C) Incorrect VLAN
An incorrect VLAN configuration can prevent devices from communicating with each other on the network. However, this would not directly cause collisions; rather, it would lead to connectivity issues by isolating traffic. The presence of collisions points to a different underlying problem.
D) Duplex mismatch
A duplex mismatch is the most likely cause of the collisions observed on the interface. When one side of the connection is set to half duplex and the other to full duplex, it can result in frequent collisions as both devices attempt to send and receive data simultaneously without proper coordination.
Conclusion
The correct answer, duplex mismatch, directly correlates with the presence of collisions on the interface, which is a common symptom of this specific configuration problem. In contrast, the other options, while they can lead to various network issues, do not directly explain the occurrence of collisions, thereby confirming duplex mismatch as the most likely cause of the switch's connection issue.