Final answer:
Hubs and repeaters extend the broadcast domain by amplifying signals and sending them to all devices in a segment, whereas switches segregate network traffic into smaller domains.
Step-by-step explanation:
Networking devices such as hubs, repeaters, and switches play different roles in a network. Hubs and repeaters are primarily used to extend the range of a network by amplifying the signal, allowing the network to cover greater distances. However, they also extend the broadcast domain, which means that they do not segregate network traffic; every packet sent by a device is broadcast to all other devices in that segment. On the other hand, switches are intelligent devices that can reduce the size of a broadcast domain by segmenting the network into multiple smaller, collision-free domains called local area networks (LANs). Nevertheless, when discussing the extension of broadcast domains, the answer is that both hubs and repeaters contribute to this, while switches have the capability to reduce it.