Understanding Tree Topology
Tree topology is indeed a combination of bus and star topologies. It is a hierarchical structure that merges the characteristics of both, making it an efficient choice in networking.

Characteristics of Tree Topology
- **Hierarchical Structure:**
Tree topology organizes nodes in a parent-child relationship, resembling a tree structure. This allows for easy expansion and management of networks.
- **Combination of Topologies:**
- **Bus Topology:** Tree topology uses a central cable (the bus) to which various star topologies can connect. This allows multiple star configurations to branch off a single backbone.
- **Star Topology:** Each node in a tree topology connects to a central hub, resembling a star configuration, which helps in easy troubleshooting and management.

Advantages of Tree Topology
- **Scalability:**
New nodes can be added without disrupting the entire network, making it highly scalable.
- **Flexibility:**
Its structure allows for the incorporation of additional nodes and sub-networks, which can be beneficial for growing organizations.

Disadvantages of Tree Topology
- **Complexity:**
The hierarchical nature can make the network more complex to manage compared to simpler topologies.
- **Dependency on Backbone:**
The entire network's performance can be impacted if the backbone (bus) fails, affecting all connected star networks.
In conclusion, tree topology effectively combines the advantages of both bus and star topologies, providing a scalable and flexible network solution while maintaining hierarchical organization.

Answer:
The combination of Bus and Star Topology is called the Tree Topology. In this topology, multiple star topologies are connected together in a hierarchical structure, with a central bus connecting them.
Here is a detailed explanation of the Tree Topology:
1. Bus Topology: In a Bus Topology, all devices are connected to a central cable called a "bus". All data transmitted by one device is received by all other devices on the bus.
2. Star Topology: In a Star Topology, each device is connected to a central hub or switch. All data transmitted by one device is received by the central hub, which then forwards it to the appropriate destination device.
3. Combination: To create a Tree Topology, multiple star topologies are connected together using a central bus. Each star topology is connected to the central bus, creating a hierarchical structure.
4. Advantages: The Tree Topology offers several advantages, including better scalability, fault tolerance, and ease of troubleshooting. It allows for the expansion of the network by simply adding more star topologies to the central bus.
5. Disadvantages: However, the Tree Topology also has some limitations. If the central bus fails, the entire network can be affected. Additionally, the hierarchical structure can lead to increased latency and slower data transmission.
In conclusion, the combination of Bus and Star Topology results in the Tree Topology, which provides a scalable and fault-tolerant network structure.