Institution: Bangladesh Development Bank Exam: Bangladesh Development Bank Ltd - Senior Officer - 24.11.2017
Topic: ICT (তথ্য ও যোগাযোগ প্রযুক্তি), Subject: Computer and ICT (তথ্য ও যোগাযোগ প্রযুক্তি)

Best Answer Explained in Below-:

In a star topology, all devices (computers) are connected to a central hub or switch. This central device acts as a relay for data transmission, meaning that data must first be sent to the hub before it can be forwarded to the intended recipient. Because of this structure, direct communication between computers on the network is not possible; all data travels through the hub, which manages and directs the traffic.

In contrast, topologies like bus and ring allow for direct communication between devices. For instance, in a bus topology, all devices share a single communication line, enabling them to send data directly to one another. Similarly, in a ring topology, data travels around the ring and can be received directly by the intended recipient as it passes through.

Tree topology, which is a mix of star and bus configurations, also allows for some degree of direct communication because sub-networks can communicate directly among their nodes.

Thus, the unique nature of the star topology, characterized by its reliance on a central hub for data transfer, is what distinguishes it as the option that does not permit direct computer-to-computer data transmission.