Tree Topology Vs Hybrid Topology
Tree Topology Vs Hybrid Topology
A tree topology combines the characteristics of linear bus and star topology. In Tree topology, group of star networks are connected to the linear bus backbone. Tree topology enables the user to expand and configure the existing network depending on the requirements. Twisted pair cable is commonly used by tree topology. Tree topology is also called as hierarchical structure.
Basic Structure of Tree Topology
A tree topology connects multiple star networks. According to the structure of star topology, all devices are connected to a central hub. There are multiple such hub devices which are connected directly to a tree bus. Thus, the hub is used as the root of the tree of number of devices. Tree networks thus may have branches that contain multiple devices connected point-to-point.
Signal from transmitting device first reaches the hub to which it is connected. Hub then directs this signal to tree bus which then travels along the entire network.
Advantages and Disadvantages of Tree Topology
Tree topology supports further expandability of the network as compared to bus and star topologies. In a bus topology, the number of devices is limited due to the broadcast traffic it generates. In star topology, the expansion of the network is limited due to less number of hub ports.
Advantages of tree topology are:
• Point-to-point wiring for each device.
• Easy to detect a faulty device.
• Easy to expand a network.
Disadvantages of tree topology are:
• More difficult to configure as compared to other topologies
• Fault in the backbone affects the entire network
• More expensive than other topologies
• Overall length of each segment is limited by the type of cabling used
Hybrid topology is a combination of different network topologies. It is also known as a Special Topology. This topology is useful for corporate offices to link their internal LANs together while adding external networks through Wide Area Networks (WANs). The commonly used combination of topologies is Star-Bus or Star-Ring. A star-bus network consists of two or more star topologies connected using a bus trunk. Whereas a tree topology, can be viewed as a collection of star networks arranged in a hierarchy. Here the function of the central node may be distributed unlike the star topology.
Basic Structure of Hybrid Topology
Hybrid topology is a network where two or more topologies are connected in such a way that the resulting network does not have one of the standard forms. This network is a combination of two or more topologies. . The ring network and bus network are connected to another network through point-to-point connection. Star topologies are connected using Multistation Access Unit (MAU) as a centralized hub. MAU connects network computers in a star topology. It has the ability to identify non-operating devices and maintain the structure of the network.
Advantages and Disadvantages of Hybrid Topology
In hybrid topology, multiple physical topologies are combined to form one large network. Each topology has its own strengths and weakness. When different types of topologies are combined, their total strength improves the network performance.
Advantages of hybrid topology are:
• Useful for implementing larger networks
• Handles larger volume of traffic
• Easy to detect and remove faulty devices
Disadvantages of hybrid topology are:
• More cabling is required as compared to all other topologies.
• More expensive than all other topologies.
• Complex structure.
• MAU is required.
• Installation and reconfiguration is difficult.
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