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Star Topology, where Hubs can act as repeaters.
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What are the types of bus topology?
There are two basic categories of network topologies Physical topologies Logical topologies The shape of the cabling layout used to link devices is called the physical topology of the network. Logical topology is the way the signals act in the network In BUS topology you have "THE LINEAR BUS" and "THE DISTRIBUTED BUS" IN the LINEAR bus all the nodes of the network are connected to a common transmission medium which has 2 end points where as in the DISTRIBUTED, all the nodes are connected to a common transmission medium which has more than 2 end points.
Do active hubs always act as repeaters in a network?
yes
What is advantage of ring topology?
a ring can operate as a communicationnetwork if it perform the following three functions. 1.data insertion 2.data reception 3.data removal 1.these functions are mainly provided by the repeaters. 2.each repeater also act as the device attachment point. hence the function of data insertion is accomplished by the repeaters. 3.data is transmitted in the form of packets. 4.each packets consists of a destination addrtess field.as this packet by a repeater , the destination address field is
How you can connect several computer by networking?
Depends on which topology you are used i.e Ring, Bus, Mesh or Star. Like in Ring topology each node is connected to 2 nodes on either side and is suitable for small network. In Star topology there is a central node to which all other nodes are connected, data is transferred from source node to central hub and then to destination node. In Bus topology one long cable act as a back bone to link all the devices and is reliable from hardware point of view.
What is a logical network designtopology?
Also called signal topology. Every LAN has a topology, or the way that the devices on a network are arranged and how they communicate with each other. The way that the workstations are connected to the network through the actual cables that transmit data -- the physical structure of the network -- is called the physical topology. The logical topology, in contrast, is the way that the signals act on the network media, or the way that the data passes through the network from one device to the next without regard to the physical interconnection of the devices. Logical topologies are bound to the network protocols that direct how the data moves across a network. The Ethernet protocol is a common logical bus topology protocol. LocalTalk is a common logical bus or star topology protocol. IBM's Token Ring is a common logical ring topology protocol. A network's logical topology is not necessarily the same as its physical topology. For example, twisted pair Ethernet is a logical bus topology in a physical star topology layout. While IBM's Token Ring is a logical ring topology, it is physically set up in a star topology.
Personnel computer that is connected to a network is?
From a network topology perspective, a personal computer that is connected to the network is a node. From a software/OS perspective, this would be a network client, but personal computers can act as, or serve the role of, a server, but I think that is out of scope of the question.
How VSAT work?
VSAT is the acronym for Very Small Aperture Terminals. VSAT are mostly configured in one of the following network topologies: a star topology, which uses a central uplink site such as an NOC (network operations centre) to transport the data back and forth to each VSAT terminal. This transportation of data to each VSAT takes place through satellite communication. The mesh topology is a type of network topology in which each of the VSAT terminals relays the data via satellite to another terminal. The VSAT terminals act as an information hub. The main advantage of this type of network topology is that it minimizes the need for a centralised uplink site. At times the star network topology and the mesh network topology are combined, which combines the main activity of both network topologies, namely acting as both a central uplinking site and an information hub, which transfers data back and forth to each of its interconnected terminals via satellite communication.
Why are nodes lymph enlarged?
Lymph nodes act as a drainage system. Depending in which part of the body inflamed lymph nodes can mean infection
What type of device is usually found at the center of an extended star topology?
both hubs and switch can act as a center of a star topology
What are the advantages and disadvantages of daisy chain topology?
TOPOLOGYDefinition:The term physical topology refers to the way in which a network is laid out physically. It refers to the configuration of cables, computers, and other peripherals. The topology of a network is the geometric representation of the relationship of all the links and linking devices (usually called nodes) to one another.There are six types of topologies:i. Mesh topology.ii. Star topology.iii. Ring topology.iv. Tree topology.v. Bus topology.vi. Hybrid topology.Mesh Topology:In a mesh topology, every device has a dedicated point-to-point link to every other device. The term dedicated means that the link carries traffic only between the two devices it connects. Here, if we have n nodes, then we need to connect to n-1 nodes and n(n-1) physical links. However, if each physical link allows communication in both directions (duplex mode), we need n(n-1)/2 links.Advantages of a Mesh TopologyEliminates traffic problems in links sharing.If one link becomes unusable, it does not incapacitate the entire system. Thus, act as robust.It has privacy and security.Point-to-point link make fault identification and fault isolation easy.Disadvantages of a Mesh TopologyInstallation and reconnection are difficult.The hardware required to connect each link (I/O ports and cable) is expensive.It is generally too costly and complex for practical networks.Star Topology:In local area networks where the star topology is used, each machine is connected to a central hub. The star topology allows each machine on the network to have a point to point connection to the central hub. All of the traffic which transverses the network passes through the central hub. The hub acts as a signal booster or repeater which in turn allows the signal to travel greater distances.Advantages of a Star TopologyEasy to install and reconfigure.No disruptions to the network when connecting or removing devices.Easy to detect faults and to remove parts.Less expensive.Includes robustness, that is, if one link fails, only that link is affected, other links remain active.Disadvantages of a Star TopologyIf the hub fails, the whole system is dead.If the hub, switch, or concentrator fails, nodes attached are disabled.Requires more cable length than a bus topology.More expensive than bus topologies because of the cost of the hubs, etc.Ring Topology:In local area networks where the ring topology is used, each computer is connected to the network in a closed loop or ring. The signal passes through each machine or computer connected to the ring in one direction, from device to device, until it reaches its destination. Each machines or computers connected to the ring act as signal boosters or repeaters. When a device receives a signal intended for another device, its repeater regenerates the bits and passes them along.Advantages of a Ring Topology· It is relatively easy to install and reconfigure.Easy to identify the problem if the entire network shuts down.Disadvantages of a Ring Topology· Only one machine can transmit on the network at a time.· The failure of one machine will cause the entire network to fail.Tree Topology: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, while 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 hierarchyAdvantages of a Tree TopologyPoint-to-point wiring for individual segments.Supported by several hardware and software venders.Disadvantages of a Tree TopologyOverall 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.Bus Topology:In local area networks where bus technology is used, each machine is connected to a long, single cable. The cable acts as a backbone to link all the devices in a network. Each computer or server is connected to the single bus cable through drop lines and some kind of connector. A terminator is required at each end of the bus cable to prevent the signal from bouncing back and forth on the bus cable.Advantages of Bus TopologyEasy to connect a computer or peripheral to a linear bus.Requires less cable length than mesh or star topologies.It is cheaper than any other topologies.Disadvantages of Bus TopologyIf the network cable breaks, the entire network will be down.Terminators are required at both ends of the backbone cable.Difficult to identify the problem if the entire network shuts down.Not meant to be used as a stand-alone solution in a large building.Include difficult reconnection and fault isolation.The managing cost of network is too high.Addition of new devices requires modification or replacement of the backbone.Hybrid Topology:Hybrid networks use a combination of any two or more topologies in such a way that the resulting network does not exhibit one of the standard topologies (e.g., bus, star, ring, etc.). A hybrid topology is always produced when two different basic network topologies are connected.Advantages of a Hybrid Topology· It provides a better result by it.· It can be designed in many ways for various purposes.Disadvantages of Hybrid Topology· It is costly.Difficult to identify the problem if the entire network shuts down.References:· Data Communication and Networking By Behrouz A Forouzan.· Wikipedia and other websites.Created By- A.H.M Tasbir Farid,B.Sc in Telecommunication & Electronic Engineering, Hajee Md. Danesh Science & Technology University, Dinajpur, Bangladesh.
Transports excess fluid from tissues to blood?
The lymphatic system: a network of vessels and nodes which act as a fluid and waste removal system as well as a major part of the immune system through growth and storage of white blood cells. The spleen is the largest lymphatic organ. Large nodes include the adenoids or tonsils.
How can a physically connected star hub logically be considered a bus network?
in the star topology central system switch or hub act as a central devices and if it fails whole the system will fail, in star topology if one station only transmit at a time other wise the collision will occur and it will broadcast the data like a bus.so it contains the properties like bus that's why said that it is logically a bus
