How can improper configuration lead to network issues?

Improper configuration can lead to network issues primarily because it can block proper data flow and communication between devices. When a network is not configured correctly, it can create barriers that prevent data packets from reaching their intended destinations. This might happen due to incorrect IP address assignments, subnet misconfigurations, or firewall settings that are too restrictive. When these barriers exist, devices on the network may be unable to communicate effectively, leading to packet loss, increased latency, or even total communication failures.

This disruption in communication directly affects the performance of network applications and services, causing slowdowns or outages that can hinder productivity. In contrast, the other options suggest outcomes that are not typical of improper configurations. For instance, incorrect settings would not enhance security protocols or speed up connectivity; instead, they could create vulnerabilities or slow down the network. Additionally, they would not reduce bandwidth consumption; rather, they could lead to inefficient use of available bandwidth. Thus, the impact of improper configuration is primarily negative, leading to obstacles in data transmission and communication.