Question

Which topology has a backbone wire that is shared among all nodes?

• A. Ring
• B. Bus
• C. Star
• D. Mesh

Hint:

One common cable shared by every node is the bus topology.

Answer 1

The Correct Option is B

Step 1: Understand the question.
The question describes a network layout with one long backbone wire. All nodes are tied to this single wire. We must name that topology (the way devices are arranged).

Step 2: Recall the concept.
A network topology is the physical or logical arrangement of nodes and links. Common types are bus, ring, star, tree and mesh. A bus topology uses one common cable called the backbone. Every node taps into it.

Step 3: Check option 1 (Ring).
In a ring, each node connects to exactly two neighbours and the links form a closed loop. There is no shared backbone wire. So option 1 is wrong.

Step 4: Check option 2 (Bus).
In a bus, every node is attached to one shared main cable, the backbone, usually with terminators at both ends. This matches the question exactly. So option 2 is correct.

Step 5: Check option 3 (Star).
In a star, every node connects to a central hub or switch with its own cable. The sharing happens at the hub, not on a backbone wire. Option 3 is wrong.

Step 6: Check option 4 (Mesh).
In a mesh, nodes have many direct links to other nodes. No single wire is shared by all. Option 4 is wrong.

Final Answer:
The topology with a shared backbone wire is the bus topology. This is option 2. \[ \boxed{\text{Bus}} \]