Answer :
Final answer:
Hubs and repeaters extend collision domains by broadcasting data signals to all devices connected to them, causing an enlarged area for potential collisions. Switches, however, maintain separate collision domains per port and thus do not extend them.
Explanation:
The components that extend collision domains in a network are hubs and repeaters. These devices repeat the electrical signal they receive across all ports, which means that data sent by one computer is broadcasted to all other computers connected to the hub or repeater, leading to a larger collision domain. This is in contrast to switches, which maintain a separate collision domain for each port, thereby limiting collisions and improving network performance.
To answer the question, the correct option is: a. hubs and repeaters.
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