Understanding Network Topologies: Identifying the Multi-access Bus Network

Network topology refers to the physical or logical arrangement of nodes (like computers or devices) in a network. Different topologies have distinct characteristics regarding how devices are connected and how data travels between them.

The question asks for a network type where all nodes connect to a single communication line and share it for communication. Let's examine the options provided:

Analyzing Network Topology Options

Let's briefly look at the characteristics of each option:

• Ring Network: In a ring topology, each node is connected to exactly two other nodes, forming a single continuous pathway for signals. Data travels around the ring in one direction. There is no single shared line for all nodes directly.
• Completely Connected Network: Also known as a mesh network, in a completely connected topology, every node is connected directly to every other node. This creates many individual links rather than a single shared line.
• Star Network: In a star topology, all nodes are connected to a central device, such as a switch or hub. Communication typically passes through the central device. While connected to a central point, nodes don't share a single linear communication line directly with each other.
• Multi-access Bus Network: In a bus topology, all nodes are connected to a single, shared communication line (often called a backbone or segment). Data is transmitted along this line, and all nodes can potentially see the data. Only the intended recipient node accepts the data. This configuration perfectly matches the description given in the question: all nodes are connected to a single line and share it. 'Multi-access' indicates that multiple devices can access the shared medium.

Identifying the Correct Network Type

Based on the analysis, the description "all nodes are connected to a single communication line and share it for all their communication needs" accurately describes a bus network topology, specifically referred to as a multi-access bus network in the options.

In a multi-access bus network:

• A single cable or line serves as the backbone.
• All devices connect directly to this backbone.
• Data signals travel along the backbone.
• All connected devices can receive the signal, but only the designated recipient processes it.
• This shared nature means that only one device can transmit data at a time to avoid collisions, necessitating access methods like CSMA/CD in older Ethernet bus networks.

This structure is fundamentally different from the point-to-point connections found in completely connected or ring networks, or the central hub connection in a star network.

Therefore, the network where all nodes are connected to a single communication line and share it is the Multi-access bus network.

Revision Table: Key Network Topologies

Additional Information: Bus Topology Details

While less common in modern wired LANs compared to star topology (using Ethernet switches), the bus topology was historically significant (e.g., early Ethernet like 10BASE2 and 10BASE5). Its key characteristics and considerations include:

• Simplicity: Relatively simple to install for small networks.
• Cable Length Limit: Performance degrades and signal reflection becomes an issue with increasing cable length, requiring terminators at both ends.
• Fault Isolation: Difficult to isolate problems. A break anywhere on the main cable can disrupt the entire network.
• Performance: As more devices are added, performance can decrease due to increased traffic and potential collisions on the shared medium.
• Collision Domain: The entire bus forms a single collision domain, meaning only one device can transmit successfully at any given time.

The term 'multi-access' highlights that multiple devices need to access the single shared communication medium to send data.