Bus Topology
The way in which devices are interconnected to form a network is called network topology. Some of the factors that affect choice of topology for a network are − • Cost − Installation cost is a very important factor in overall cost of setting up an infrastructure. So cable lengths, distance between nodes, location of servers, etc. Have to be considered when designing a network. • Flexibility − Topology of a network should be flexible enough to allow reconfiguration of office set up, addition of new nodes and relocation of existing nodes. • Reliability − Network should be designed in such a way that it has minimum down time. Failure of one node or a segment of cabling should not render the whole network useless.
Bus topology is a specific kind of network topology in which all of the various devices in the network are connected to a single cable or line. In general, the term refers to how various devices are set up in a network.
• Scalability − Network topology should be scalable, i.e. It can accommodate load of new devices and nodes without perceptible drop in performance. • Ease of installation − Network should be easy to install in terms of hardware, software and technical personnel requirements. • Ease of maintenance − Troubleshooting and maintenance of network should be easy. Bus Topology Data network with bus topology has a linear transmission cable, usually coaxial, to which many network devices and workstations are attached along the length. Server is at one end of the bus. When a workstation has to send data, it transmits packets with destination address in its header along the bus.
The data travels in both the directions along the bus. When the destination terminal sees the data, it copies it to the local disk. Advantages of Bus Topology These are the advantages of using bus topology − • Easy to install and maintain • Can be extended easily • Very reliable because of single transmission line Disadvantages of Bus Topology These are some disadvantages of using bus topology − • Troubleshooting is difficult as there is no single point of control • One faulty node can bring the whole network down • Dumb terminals cannot be connected to the bus Ring Topology In ring topology each terminal is connected to exactly two nodes, giving the network a circular shape. Data travels in only one pre-determined direction. When a terminal has to send data, it transmits it to the neighboring node which transmits it to the next one. Before further transmission data may be amplified.
In this way, data raverses the network and reaches the destination node, which removes it from the network. If the data reaches the sender, it removes the data and resends it later.
• 0 shares • • • • • Bus Topology Introduction to: As you know, there are several types of in networking. These different networking layouts reflect different ways to connect nodes to a network. One of these types of topology is called “bus topology.” Bus topology is a fairly simple network layout that supports any number of nodes.
Just as with other layouts, this method of topology has its own advantages and disadvantages. By examining how this layout is structured, we can begin to understand why and how it works, and why it has the advantages and disadvantages that it does. Related: How Bus Topology Works? Understanding the structure of bus topology is key to understanding how and why it works.
With bus topology, different nodes are all separately located to the same main cable. In order to understand this layout, first you should imagine one main cable that connects the network. Different nodes can be connected to this cable. It’s important to note that these nodes are not connected to one another. Instead, they are all independently connected to this main cable. There is no limit to the number of nodes that can be added to this network in theory, but the number of connected nodes can actually affect the quality of the network. When you compare this network layout to, it’s clear to see that it has some advantages.
Download o re piya atif aslam mp3 song. For one, whereas point to point topology requires that there can only be two nodes, bus topology allows for multiple nodes. Related: This means that several different computers, routers, or other data devices can be connected to this network. This makes bus topology a better choice for small businesses or small schools and office spaces because of its ability to support a larger network. Disadvantages of Bus Topology: However, this topology comes with a few drawbacks on its own. Though it is able to support larger networks, this comes with a small caveat. Because all of the computers are connected to the same main cable, it certainly comes as no surprise that increasing the number of nodes present in the network will affect the network’s quality and speed.
When more nodes are added, more data must be transmitted, and because all of the nodes are connected along the same main cable, this data all must travel along this single cable. This leads to something known as data collision. This collision makes networks slower and prevents networks from growing too large with bus topology. This means that while bus topology is a step up from point to point and is still fairly simple to set up and maintain, it is not ideal for very large networks. What’s more, because all of the nodes are dependent on the main cable, if there is a problem with the main cable, the whole network becomes ineffective. Still, bus topology provides a cost-effective layout that can benefit certain circumstances.
Logical Bus Topology In local area networks where bus topology is used, each node is connected to a single cable. Each computer or server is connected to the single bus cable. A signal from the source travels in both directions to all machines connected on the bus cable until it finds the intended recipient. If the machine address does not match the intended address for the data, the machine ignores the data. Alternatively, if the data matches the machine address, the data is accepted.
Since the bus topology consists of only one wire, it is rather inexpensive to implement when compared to other topologies. However, the low cost of implementing the technology is offset by the high cost of managing the network. Additionally, since only one cable is utilized, it can be the single point of failure. If the network cable is terminated on both ends and when without termination data transfer stop and when cable breaks, the entire network will be down. Logical Mesh Topology A Mesh topology Provides each device with a point-to-point connection to every other device in the network. These are most commonly used in WAN's, which connect networks over telecommunication links.
Mesh topologies use routers to determine the best path. Mesh networks provide redundancy, in the event of a link failure, meshed networks enable data to be routed through any other site connected to the network. Because each device has a point-to-point connection to every other device, mesh topologies are the most expensive and difficult to maintain. Logical Star Topology Star networks are one of the most common computer network topologies. In its simplest form, a star network consists of one central switch, hub or computer which acts as a router to transmit messages.
Bus Topology Cable
If the central node is passive, the originating node must be able to tolerate the reception of an echo of its own transmission, delayed by the two-way transmission time (i.e. To and from the central node) plus any delay generated in the central node. An active star network has an active central node that usually has the means to prevent echo-related problems. The star topology reduces the chance of network failure by connecting all of the systems to a central node. When applied to a bus-based network, this central hub rebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, sometimes including the originating node.
Bus Topology Examples
All peripheral nodes may thus communicate with all others by transmitting to, and receiving from, the central node only. The failure of a transmission line linking any peripheral node to the central node will result in the isolation of that peripheral node from all others, but the rest of the systems will be unaffected.