Final answer:
The true statement about hubs is that devices connected to a hub share the available bandwidth. Hubs operate in half-duplex mode, do not maintain a table of MAC addresses, and cannot handle multiple conversations simultaneously.
Step-by-step explanation:
The question relates to the functioning and characteristics of hubs in a network. Among the options provided:
- a. Devices on a hub have to share the available bandwidth. This statement is true. When connected to a hub, all devices share the total available bandwidth, which can lead to network congestion and lower performance.
- b. Hubs can operate in full-duplex and half-duplex mode. This is false; hubs typically operate only in half-duplex mode, meaning data can be transmitted in only one direction at a time.
- c. They maintain a table of MAC addresses. This is false; maintaining a table of MAC addresses is the function of a switch, not a hub.
- d. They can handle several computer conversations simultaneously. This is false; due to the shared bandwidth and half-duplex nature of hubs, they cannot manage multiple conversations simultaneously like a switch can.
Therefore, the correct answer to which statement is true about hubs is a. Devices on a hub have to share the available bandwidth.