CompTIA Network+ Practice Test

What is a typical result of link flapping in a network interface?

1. Increased data transmission rates

2. Disabling of the interface

3. Consistent network access

4. Enhanced security features

The correct answer is: Disabling of the interface

Link flapping refers to a situation where a network interface repeatedly goes up and down, which can lead to instability in the network connection. When this occurs, network devices, such as switches and routers, might interpret it as a sign of an issue, such as a faulty cable or problematic hardware. In response to this instability, the network device may automatically disable the interface to prevent further disruptions and maintain overall network stability. This action helps to eliminate erratic behavior that could negatively impact network performance, allowing network administrators to diagnose and resolve the underlying issue more effectively. The disabling of the interface can prevent broadcast storms or other issues that would occur due to rapid state changes, leading to more reliable network operations when the interface is re-enabled after the problem is addressed. In contrast, the other options do not accurately reflect the consequences of link flapping. Increased data transmission rates, consistent network access, and enhanced security features would not result from an interface that is experiencing link flapping; rather, these would be expected outcomes of a stable and functioning network interface.