Star Topology Cost
Disadvantages of a Tree Topology • Overall length of each segment is limited by the type of cabling used. • If the backbone line breaks, the entire segment goes down. • More difficult to configure and wire than other topologies. 5-4-3 Rule A consideration in setting up a tree topology using Ethernet protocol is the 5-4-3 rule. One aspect of the Ethernet protocol requires that a signal sent out on the network cable reach every part of the network within a specified length of time. Each concentrator or repeater that a signal goes through adds a small amount of time. This leads to the rule that between any two nodes on the network there can only be a maximum of 5 segments, connected through 4 repeaters/concentrators.
While the isolation of devices happens to be its triumph card―with most of its advantages revolving around this particular aspect, its dependence on the central hub is definitely an issue of concern. Advantages ▶ It is very easy to install and manage the star network topology, as it is the simplest of the lot when it comes to functionality. ▶ It is easy to troubleshoot this network type, as all computers are dependent on the central hub which invariably means that any problem which leaves the network inoperable can be traced to the central hub. ▶ In star network topology, data packets don't have to make their way through various nodes. The fact that there is no data collision adds to its performance by making data transfer considerably fast. ▶ Also, the fact that data packets only make it through three different points ensures that the data is safe. ▶ As the nodes are not connected to each other, any problem in one particular node doesn't hamper the performance of other nodes in the network.
3) Expansion and modification in topology can be done without disrupting other nodes. Disadvantages of Mesh topology 1) There are high chances of redundancy in many of the network connections. 2) Overall cost of this network is way too high as compared to other network topologies. 3) Set-up and maintenance of this topology is very difficult. Even administration of the network is tough. Star topology is the most common topology in use today. In a star topology, each device has a dedicated point to point link only to central controller “hub”. A hub is a rectangular box-shaped device with multiple plug-in points called ‘ports’.
• If the connecting network device () fails, nodes attached are disabled and cannot participate in network communication. • More expensive than because of the cost of the connecting devices ().
4) Ring Topology In the ring topology, the nodes are connected in the form of a ring with the help of twisted pair cable. Each node is connected directly to the other two nodes in the network. The node, which wants to send a message, first passes the message to its consecutive node in the network. Data is transmitted in the clockwise direction from one node to another. Figure 4 shows the arrangement of computers in the ring topology.
Every node is a peer; there is no hierarchical relationship of clients and servers. If one node is unable to re transmit data, it severs communication between the nodes before and after it in the bus. Advantages: • When the load on the network increases, its performance is better than bus topology. • There is no need of network server to control the connectivity between workstations. Disadvantages: • Aggregate network bandwidth is bottlenecked by the weakest link between two nodes. Partially connected mesh topology In a partially connected network, certain nodes are connected to exactly one other node; but some nodes are connected to two or more other nodes with a point-to-point link. This makes it possible to make use of some of the redundancy of mesh topology that is physically fully connected, without the expense and complexity required for a connection between every node in the network.
Since the bus topology consists of only one wire, it is cheap to implement compared to other topologies. However, there is a higher cost of managing the network.
It also acts as a for the data flow. This configuration is common with. However, it can also be used with or optical fiber cable. What are the Advantages and Disadvantages of Star Topology.?
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Star Network Topology Cost
Tree network topology Also known as a hierarchy network. The type of network topology in which a central 'root' node (the top level of the hierarchy) is connected to one or more other nodes that are one level lower in the hierarchy (i.e., the second level) with a point-to-point link between each of the second level nodes and the top level central 'root' node. Each of the second level nodes that are connected to the top level central 'root' node will also have one or more other nodes that are one level lower in the hierarchy (i.e., the third level) connected to it, also with a point-to-point link, the top level central 'root' node being the only node that has no other node above it in the hierarchy (The hierarchy of the tree is symmetrical.) Each node in the network having a specific fixed number, of nodes connected to it at the next lower level in the hierarchy, the number, being referred to as the 'branching factor' of the hierarchical tree.
Since several devices may need to use the wire at once, machines are said to be contending for the media. If the system is operating within tolerable limits, every machine will eventually get the opportunity to transfer data. Figure 2-9: With contention systems, devices must listen for the opportunity to transmit data.