What is the major consequence of having duplicate frames in a network?

Having duplicate frames in a network primarily leads to network congestion. This situation arises because duplicate frames consume additional bandwidth and processing resources. When multiple copies of the same frame are present, devices such as switches and routers need to process these redundant messages, which can overload their capacity, leading to slower network performance and delays in data transmission.

This congestion can manifest in various ways, such as increased latency, packet loss, and reduced overall throughput for the network. Under heavy loads, this might result in devices becoming overwhelmed, which can also contribute to additional retransmissions and further exacerbate congestion.

On the other hand, improved speed of data transmission, increased security, and enhanced error checking are not direct outcomes of duplicate frames. While these aspects are essential in networking, they do not apply in this context where the presence of duplicates can create more challenges than benefits.