What Is Topology And Its Types In Networking Pdf

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Network topologies describe the methods in which all the elements of a network are mapped.

Network topologies

Topology defines the structure of the network of how all the components are interconnected to each other. There are two types of topology: physical and logical topology. CSMA: It is a media access control used to control the data flow so that data integrity is maintained, i. There are two alternative ways of handling the problems that occur when two nodes send the messages simultaneously.

Reliable: The mesh topology networks are very reliable as if any link breakdown will not affect the communication between connected computers. Easier Reconfiguration: Adding new devices would not disrupt the communication between other devices. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. Computer Network. Transport Layer Transport Layer Protocols.

Next Topic Transmission modes. Manual T. Verbal A. Angular 7. Compiler D. Software E. Web Tech. Cyber Sec. Control S. Data Mining. Javatpoint Services JavaTpoint offers too many high quality services. Physical topology is the geometric representation of all the nodes in a network. Bus Topology The bus topology is designed in such a way that all the stations are connected through a single cable known as a backbone cable. Each node is either connected to the backbone cable by drop cable or directly connected to the backbone cable.

When a node wants to send a message over the network, it puts a message over the network. All the stations available in the network will receive the message whether it has been addressed or not. The bus topology is mainly used in The configuration of a bus topology is quite simpler as compared to other topologies.

The backbone cable is considered as a "single lane" through which the message is broadcast to all the stations. Once the collision is detected, the sender will stop transmitting the data. Therefore, it works on " recovery after the collision ". If busy, then the sender waits until the media becomes idle.

This technique effectively reduces the possibility of the collision. It does not work on "recovery after the collision". Advantages of Bus topology: Low-cost cable: In bus topology, nodes are directly connected to the cable without passing through a hub.

Therefore, the initial cost of installation is low. Moderate data speeds: Coaxial or twisted pair cables are mainly used in bus-based networks that support upto 10 Mbps. Familiar technology: Bus topology is a familiar technology as the installation and troubleshooting techniques are well known, and hardware components are easily available.

Limited failure: A failure in one node will not have any effect on other nodes. Disadvantages of Bus topology: Extensive cabling: A bus topology is quite simpler, but still it requires a lot of cabling.

Difficult troubleshooting: It requires specialized test equipment to determine the cable faults. If any fault occurs in the cable, then it would disrupt the communication for all the nodes. Signal interference: If two nodes send the messages simultaneously, then the signals of both the nodes collide with each other.

Reconfiguration difficult: Adding new devices to the network would slow down the network. Attenuation: Attenuation is a loss of signal leads to communication issues. Repeaters are used to regenerate the signal.

Ring Topology Ring topology is like a bus topology, but with connected ends. The node that receives the message from the previous computer will retransmit to the next node. The data flows in one direction, i. The data flows in a single loop continuously known as an endless loop.

It has no terminated ends, i. The data in a ring topology flow in a clockwise direction. The most common access method of the ring topology is token passing. Token passing: It is a network access method in which token is passed from one node to another node. Token: It is a frame that circulates around the network. Working of Token passing A token moves around the network, and it is passed from computer to computer until it reaches the destination.

The sender modifies the token by putting the address along with the data. The data is passed from one device to another device until the destination address matches. Once the token received by the destination device, then it sends the acknowledgment to the sender. In a ring topology, a token is used as a carrier.

Advantages of Ring topology: Network Management: Faulty devices can be removed from the network without bringing the network down. Product availability: Many hardware and software tools for network operation and monitoring are available. Cost: Twisted pair cabling is inexpensive and easily available.

Therefore, the installation cost is very low. Reliable: It is a more reliable network because the communication system is not dependent on the single host computer. Disadvantages of Ring topology: Difficult troubleshooting: It requires specialized test equipment to determine the cable faults.

Failure: The breakdown in one station leads to the failure of the overall network. Delay: Communication delay is directly proportional to the number of nodes.

Adding new devices increases the communication delay. Star Topology Star topology is an arrangement of the network in which every node is connected to the central hub, switch or a central computer.

The central computer is known as a server , and the peripheral devices attached to the server are known as clients. Coaxial cable or RJ cables are used to connect the computers.

Hubs or Switches are mainly used as connection devices in a physical star topology. Star topology is the most popular topology in network implementation. Advantages of Star topology Efficient troubleshooting: Troubleshooting is quite efficient in a star topology as compared to bus topology. In a bus topology, the manager has to inspect the kilometers of cable. In a star topology, all the stations are connected to the centralized network.

Therefore, the network administrator has to go to the single station to troubleshoot the problem. Network control: Complex network control features can be easily implemented in the star topology. Any changes made in the star topology are automatically accommodated.

Limited failure: As each station is connected to the central hub with its own cable, therefore failure in one cable will not affect the entire network. Familiar technology: Star topology is a familiar technology as its tools are cost-effective. Easily expandable: It is easily expandable as new stations can be added to the open ports on the hub. Cost effective: Star topology networks are cost-effective as it uses inexpensive coaxial cable.

High data speeds: It supports a bandwidth of approx Mbps. Ethernet BaseT is one of the most popular Star topology networks. Disadvantages of Star topology A Central point of failure: If the central hub or switch goes down, then all the connected nodes will not be able to communicate with each other. Cable: Sometimes cable routing becomes difficult when a significant amount of routing is required. Tree topology Tree topology combines the characteristics of bus topology and star topology.

A tree topology is a type of structure in which all the computers are connected with each other in hierarchical fashion.

The top-most node in tree topology is known as a root node, and all other nodes are the descendants of the root node. There is only one path exists between two nodes for the data transmission. Thus, it forms a parent-child hierarchy. Advantages of Tree topology Support for broadband transmission: Tree topology is mainly used to provide broadband transmission, i.

Easily expandable: We can add the new device to the existing network. Therefore, we can say that tree topology is easily expandable. Easily manageable: In tree topology, the whole network is divided into segments known as star networks which can be easily managed and maintained.

DCN - Computer Network Topologies

Network Topology is the schematic description of a network arrangement, connecting various nodes sender and receiver through lines of connection. Bus topology is a network type in which every computer and network device is connected to single cable. When it has exactly two endpoints, then it is called Linear Bus topology. It is called ring topology because it forms a ring as each computer is connected to another computer, with the last one connected to the first. Exactly two neighbours for each device. In this type of topology all the computers are connected to a single hub through a cable. This hub is the central node and all others nodes are connected to the central node.


– Logical – the way in which the network appears to the devices that use it. • Common topologies: – Bus, ring, star, mesh and wireless. Page.


Network topology

Topology defines the structure of the network of how all the components are interconnected to each other. There are two types of topology: physical and logical topology. CSMA: It is a media access control used to control the data flow so that data integrity is maintained, i. There are two alternative ways of handling the problems that occur when two nodes send the messages simultaneously. Reliable: The mesh topology networks are very reliable as if any link breakdown will not affect the communication between connected computers.

The physical topology of a network refers to the configuration of cables, computers, and other peripherals. Physical topology should not be confused with logical topology which is the method used to pass information between workstations. Logical topology was discussed in the Protocol chapter. The following sections discuss the physical topologies used in networks and other related topics. A linear bus topology consists of a main run of cable with a terminator at each end See fig.

Network operating systems support a number of security features that control access to the network. The cells slightly. Three basic types of network connections exist: Point-to-point connections allow one device to communicate with one other device.

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What is network topology and types of network topology?

Network topology is the arrangement of the elements links , nodes , etc. Network topology is the topological [4] structure of a network and may be depicted physically or logically. It is an application of graph theory [3] wherein communicating devices are modeled as nodes and the connections between the devices are modeled as links or lines between the nodes. Physical topology is the placement of the various components of a network e. Distances between nodes, physical interconnections, transmission rates , or signal types may differ between two different networks, yet their logical topologies may be identical. Examples of network topologies are found in local area networks LAN , a common computer network installation. Any given node in the LAN has one or more physical links to other devices in the network; graphically mapping these links results in a geometric shape that can be used to describe the physical topology of the network.

A Network Topology is the arrangement with which computer systems or network devices are connected to each other. Topologies may define both physical and logical aspect of the network. Both logical and physical topologies could be same or different in a same network. Point-to-point networks contains exactly two hosts such as computer, switches or routers, servers connected back to back using a single piece of cable. Often, the receiving end of one host is connected to sending end of the other and vice-versa.

Network Topology

Topology is derived from two Greek words topo and logy, where topo means 'place' and logy means 'study'. In computer networks, a topology is used to explain how a network is physically connected and the logical flow of information in the network. A topology mainly describes how devices are connected and interact with each other using communication links. Network topology defines the layout, virtual shape, or structure of the network, not only physically but also logically. A network can have one physical topology and multiple logical topologies at the same time.

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Chapter 5: Topology

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