# Ring Topology ## What is Ring Topology Ring topology is a network configuration in which each device is connected to exactly two other devices, forming a circular or ring structure. Data travels around the ring in one direction, passing through each device in sequence until it reaches its destination. In a single ring, if one device or connection fails, the entire ring is broken and communication stops. Dual ring topology addresses this by having two rings with data flowing in opposite directions, providing redundancy. ## Token Ring Technology The most well-known implementation of ring topology was Token Ring, developed by IBM. In Token Ring, a special signal called a token continuously circulates around the ring. A device can only transmit data when it holds the token. When a device has data to send, it waits until it receives the free token, then attaches its data to the token and sends it around the ring. The receiving device copies the data and marks the token as having been received. When the token returns to the sender, the sender removes the data and releases a free token for the next device to use. ## Advantages of Ring Topology Ring topology provides equal access to all devices because each device takes turns transmitting using the token. There are no collisions in a ring network using token passing. Performance is predictable and does not degrade under heavy load as much as bus topology. Dual ring configurations provide redundancy against cable failures. ## Disadvantages of Ring Topology A single failure in the ring can bring down the entire network in a single ring configuration. Adding or removing devices requires temporarily interrupting the ring. Troubleshooting problems in a ring can be more difficult than in a star topology. Ring topology has largely been replaced by star topology with Ethernet in modern networks.