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Topology
While geometry is primarily concerned with the mathematical properties of spatial objects, topology is concerned with the mathematical properties of those objects under continuous deformations. Please post all questions about topological subjects like homeomorphisms, manifolds, convergence, and connectedness, as well as their broad applications in computing, physics, and graph theory, into this category.
1,087 Questions
Which topology represents a collision-free environment?
network
this is cisco ccna online test. the answer should be option #3
History of network topologies?
The history of network topologies dates back to 1969-1970. This what when Roberts, who is now known as Dr. Howard, started researching on network topologies and founded Network Analysis Corporation.
What makes the star topology better than the other networks?
Star topology is the simplest and most comprehensible example of a centralized network there is. In star topology, all of the computers, printers, security feeds, etc., etc. that use the network are connected to a centralized hub, rather than to each other, in a star-like shape. The main advantage of this is that if one device goes down, the others stay up.
The obvious disadvantage of this is the network's dependence on the hub; if it fails, everything fails. Many chain-store type business's, much to the frustration of their employees, have actually turned this disadvantage into an advantage. Instead of spending money on quality devices at the store level, the business's put all of their money into the hub, then add a backup hub as a fail safe, and then finally an off-site disaster recovery hub for emergencies.
the ring topology is a network within which all computer are connected like in a circle. The ring topology data transmission is depending on a token. it's a programme given to a computer to allow it to communicate with others computers. it's useful but if one computer goes down, the topology is down too.
Difference between logical topology and physical topology?
The physical connection is layer 1 of the OSI model, and is the medium through which the data is transfered. i.e., cables
The logical connection is layer 3 of the OSI model, and is the network portion. Using the Internetwork Protocol (IP), each host is assigned a 32 bit IP address. e.g. 192.168.1.1
Categorize the four basic topologies in terms of line configuration?
Point to point- mesh and star.
Multi point- bus and ring.
A star topology.
A star topology.
A star topology.
A star topology.
What are facts about bus topology?
Good compromise over the other two topologies as it allows relatively high rate of data tansmittion.
Well suited for temporary networks that must be set up in a hurry.
Easy to implement and extend.
What is meant by network congestion?
When too many packets are present in a subnet, performance degrades. This situation is called Congestion.
Update:
In any network when there is too much the data traffic at a node that the network slows down or starts loosing data, it is known as network congestion. It degrades quality of service and also can lead to delays, lost data or e.g. dropped calls on a telephone network.
- Neeraj Sharma
when excess of data travels in a subnet or in node there will be a loss of data, this excess flow is know as network congestion.This demotes the performance in network e.g.improper delivery of fax
What is node in network topology?
A node is a single workstation present in a computer networking, many node together when combined makes a network.
when we decide to form a network such a shortest path have to establish for data transmitting,different type of topology we have to use.
for eg:-if i hav one server or hub or a switch(one centralize device)and 15 clients
to connect ,then there are various ways to connect them according to our need...
topologies are of type:
!)star-when we need all the terminal attched to one central decice
2)ring-whn we need all terminals connect to each other also
2)mesh-combination of ring and star
4)bus-when we dont need centrliez device,onle connect one terminal to another and so on
5)hybrid-combination of all topology
Which topology is the most commonly used server network topology?
The most common LAN topology is that of a "star." In a star topology, each computer, or "node", is connected to a central hub. This is more reliable than a more classical "ring" topology, because a node failing will not bring down the entire network. A bus topology is arguably more reliable, but has poorer performance.
What are the characteristics of the star topology?
In a star topology, each device connects to a central network connectivity device such as a hub, switch, or router. These devices would be connected as a "star" (points on a star).
The other characteristic of a star topology is that a failing connection will only affect the failed device unless that device is the connectivity device. This means that in most cases a failing device on a star will not take down the entire network.
Another characteristic of a star is that they are easily expandable and scalable.
What is the connector is being used in ring topology?
A ring topology is a network topology or circuit arrangement in which each network device is attached along the same signal path to two other devices, forming a path in the shape of a ring. Each device in the network that is also referred to as node handles every message that flows through the ring. Each node in the ring has a unique address. Since in a ring topology there is only one pathway between any two nodes, ring networks are generally disrupted by the failure of a single link.
The redundant topologies are used to eliminate network downtime caused by a single point of failure. All networks need redundancy for enhanced reliability. Network reliability is achieved through reliable equipment and network designs that are tolerant to failures and faults. The FDDI networks overcome the disruption in the network by sending data on a clockwise and a counterclockwise ring. In case there is a break in data flow,the data is wrapped back onto the complementary ring before it reaches the end of the cable thereby maintaining a path to every node within the complementary ring.
I say Star Topology. Watch this video: http://www.youtube.com/watch?v=ihb_qa6qTbE It explains different topologies. Good luck
What is digital token in e-commerce?
The digital token based payment system is a new form of electronic payment system which is based on electronic tokens rather than e-cheque or e-cash. The electronic tokens are generated by the bank or some financial institutions. Hence we can say that the electronic tokens are equivalent to the cash which are to be made by the bank.
What are the advantages and disadvantages of daisy chain topology?
TOPOLOGY
Definition:
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 Topology
- Eliminates 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 Topology
- Installation 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 Topology
- Easy 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 Topology
- If 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 hierarchy
Advantages of a Tree Topology
- Point-to-point wiring for individual segments.
- Supported by several hardware and software venders.
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.
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 Topology
- Easy 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 Topology
- If 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.
What is the best networking topology to use for a library lan and why?
he most commonly used network topology is a hybrid topology called the Star Bus Topology
What is the differences between ring topology and star topology?
in bus topology computers are connected with each other by a wire in a approximately strait manner..and if one computer stops working the whole network will stop. while in star topology every computer is connected with the host computer & much wire is require..and if any client computer tops working it will not effect the whole network.----ravi singh chauhan...7275974787
Can a single physical topology support multiple logical topologies give the reason?
Can a single physical topology support multiple logical topologies give a proper reason.
Three common protocols to modern computer networks?
The main communication or network protocol is the TCP/IP protocol. (Transmission Control Protocol/Internet Protocol)
