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Topic: Network topology

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In the News (Fri 19 Apr 19)

  Network topology - Wikipedia, the free encyclopedia
A network topology is the pattern of links connecting pairs of nodes of a network.
Network topology is determined only by the configuration of connections between nodes; it is therefore a part of graph theory.
As in the conventional star network, individual nodes may thus still be isolated from the network by a single-point failure of a transmission path to the node.
en.wikipedia.org /wiki/Network_topology   (1227 words)

 Network Topologies
In a Bus, all the devices on the network are connected to a common cable.
A Mesh topology consists of a network where every device on the network is physically connected to every other device on the network.
For example, a three or four node mesh network is relatively easy to create, whereas it is impractical to set up a mesh network of 100 nodes -- the number of interconnections would be so ungainly and expensive that it would not be worth the effort.
www.delmar.edu /Courses/ITNW2313/network.htm   (468 words)

 Definition: network topology
star topology: A network topology in which peripheral nodes are connected to a central node, which rebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, including the originating node.
tree topology: A network topology that, from a purely topologic viewpoint, resembles an interconnection of star networks in that individual peripheral nodes are required to transmit to and receive from one other node only, toward a central node, and are not required to act as repeaters or regenerators.
Note 2: As in the conventional star network, individual nodes may thus still be isolated from the network by a single-point failure of a transmission path to the node.
www.its.bldrdoc.gov /fs-1037/dir-024/_3535.htm   (547 words)

 Network Topology
This network topology is referred to by many as "the campus backbone." Nearly 20,000 networked computers in UW offices and labs are connected to routers located in one of three routing centers on campus.
In topologies that use a single shared medium (such as a simple classical Ethernet segment), a network problem can often be diagnosed by connecting a network analysis tool to that segment.
As the topologies become more complicated, a particular network conversation will usually involve traffic running over several different network segments, all of which must be analyzed in order to get a complete picture of what is happening.
www.washington.edu /computing/windows/issue17/topology.html   (1441 words)

 COMMUNICATIONS Network Topology
Networks can be classified by their topology, which is the basic geometric arrangement of the network.
The bus network is less expensive than the star configuration and is thus widely in use for systems that connect only a few microcomputers and systems that do not emphasize the sharing of common resources.
A hierarchical network (or a tree network) resembles a star network in that several computers are connected to a central host computer (usually a mainframe).
sunset.backbone.olemiss.edu /~misbook/conetom.htm   (969 words)

 What is topology? - a definition from Whatis.com   (Site not responding. Last check: 2007-10-09)
In communication networks, a topology is a usually schematic description of the arrangement of a network, including its nodes and connecting lines.
In the star network topology, there is a central computer or server to which all the workstations are directly connected.
In the ring network topology, the workstations are connected in a closed loop configuration.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci213156,00.html   (466 words)

 Network Tutorial: Topology
A star topology is designed with each node (file server, workstations, and peripherals) connected directly to a central network hub or concentrator (See fig.
A star-wired ring topology may appear (externally) to be the same as a star topology.
A linear bus network may be the least expensive way to install a network; you do not have to purchase concentrators.
members.tripod.com /barhoush_2/topology.htm   (677 words)

Repeater - A device used in a network to strengthen a signal as it is passed along the network cable.
Star Topology - LAN topology in which each node on a network is connected directly to a central network hub or concentrator.
In networks, it is generally used to allow for the connection between two different types of cable connectors, such as AUI and RJ-45.
fcit.usf.edu /network/glossary.htm   (1986 words)

 Lesson 3: Network Topology
The bus topology is often referred to as a "linear bus" because the computers are connected in a straight line.
The computers on the network will still be able to function as stand-alone computers; however, as long as the segment is broken, they will not be able to communicate with each other or otherwise access shared resources.
To determine which type of topology would be most appropriate for your site, add up the number of bus selections with check marks next to them, the number of star-bus selections with check marks next to them, and the number of star-ring selections with check marks next to them.
distancelearning.ksi.edu /demo/370/ch01d.htm   (4355 words)

 An Atlas of Cyberspaces - Topology Maps
A topology map of a core network of a medium-sized ISP.
It was created using an automatic network discovery tool called Mercator developed as part of the Scan project by Ramesh Govindan, Anoop Reddy and colleagues, at the Information Sciences Institute, USA.
The map above left shows the ATM network circa September 1996, while the map on the right is a schematic map of the backbone topology of SuperJANET III from early 1998.
www.cybergeography.org /atlas/topology.html   (668 words)

 MeshDynamics-- Managing Mesh Network Topology
Managing Mesh Topology: Wired networks are relatively impervious to changes in the environment - the bandwidth of an Ethernet "pipe" is not affected by radio interference, people moving about or the presence of metallic objects.
Since the effects are inherently dynamic in nature, wireless network performance cannot be managed by traditional central control methods used for configuring and managing wired networks.
As the network is directed to emphasize throughput, it begins to make changes to the topology such that a larger number of hops is used in order to make sure that each mesh connection is at a higher data rate.
www.meshdynamics.com /wControlLayer.html   (935 words)

 Webopedia: Network Topologies
Topology refers to the shape of a network, or the network's layout.
How different nodes in a network are connected to each other and how they communicate are determined by the network's topology.
Groups of star-configured networks are connected to a linear bus backbone.
www.webopedia.com /quick_ref/topologies.asp   (160 words)

 APPN Implementers Workshop   (Site not responding. Last check: 2007-10-09)
An extension to SNA featuring (a) greater distributed network control that avoids critical hierarchical dependencies, thereby isolating the effects of single points of failure; (b) dynamic exchange of network topology information to foster ease of connection, reconfiguration, and adaptive route selection; (c) dynamic definition of network resources; and (d) automated resource registration and directory lookup.
For example, each networked computer can be directly connected to every other computer (known as a "mesh") or they can all connect through a single routing "hub." Alternatively, some customers will choose to continue to use a hierarchical network design.
Network nodes can also detect that they are under a heavy load and go into a congested state.
www.networking.ibm.com /app/aiwintro.htm   (4053 words)

 Securing a Solaris Server - Network Topology
The general network topology that I've assumed in the rest of this web page, is a server with one or more network interfaces that are connected to the Internet, without any filters.
Many educational institutions also use this topology, even though they usually use high-speed leased lines, with several Megabits per second bandwidth, coupled with powerful routers and switches, and is an example of a political decision to use this topology.
In most cases, this network topology is acceptable, only if there are a very small number of systems on your network.
www.accs.com /p_and_p/SolSec/network.html   (1085 words)

 Chapter 5: Topology
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.
This rule does not apply to other network protocols or Ethernet networks where all fiber optic cabling or a combination of a fiber backbone with UTP cabling is used.
fcit.coedu.usf.edu /network/chap5/chap5.htm   (718 words)

 Cisco Network Topology and Design > Requirements and Constraints   (Site not responding. Last check: 2007-10-09)
In this case, the first area of concern is the amount of effort and level of skill necessary to connect a new customer to the network or to expand the capacity of the network infrastructure.
Building networks that are backward-compatible with legacy applications—such as the need to support protocols such as SNA and DECNET—can be extremely demanding.
Valuable engineering cycles spent on extremely detailed requirements or network flow analysis would be better spent ensuring an extensible and scalable network infrastructure, and explaining contingency plans to the customer, if the actual requirements exceed those projected.
www.ciscopress.com /articles/article.asp?p=25188   (1137 words)

 Network-modeling tools - Network World   (Site not responding. Last check: 2007-10-09)
Fritz is the director of Enterprise Networking Services for the University of California, San Francisco, and is responsible for network technology development and campus-wide voice and data network operations.
Fritz is also a member of the Network World Lab Alliance, a cooperative of the premier reviewers in the network industry, each bringing to bear years of practical experience on every review.
The key to network modeling is the ability to closely match the generated network model map to the real network topology.
www.networkworld.com /reviews/2004/1018rev.html   (2244 words)

     Network & Topology Discovery   (Site not responding. Last check: 2007-10-09)
Topology discovery is run for one DGE Location at a time, by the least-loaded DGE in that location.
Figure 5.2 shows a sample network that includes three subnets, each of which is connected to a router.
The tool will also automatically discover available network interfaces, system resources, various application services, etc. on the devices, and using the default test threshold values, automatically create the tests in the system so that you can be up and running in a very short period of time.
www.fidelia.com /support/docs/v4.0/nvug-07-1.html   (1297 words)

 Layer 2 Layout: Layer 2 Discovery Digs Deep - Network & Systems Management - Network Computing   (Site not responding. Last check: 2007-10-09)
Hewlett-Packard's HP OpenView Network Node Manager and similar products provide solid Layer 3 information, but that data is primitive--just basic facts on adds and removals, not details on where or how these devices operate with network services.
And network devices don't always behave, failing to flush cached but aged MAC (Media Access Control) address entries, for example, so defunct equipment appears to be still attached to the network.
That's a tall order even if your network is mostly a Cisco shop, since the same models of some Cisco switches have configuration differences of their own.
www.networkcomputing.com /showitem.jhtml?docid=1423ws1   (1331 words)

 Mesh Network Topology and Architecture
Mesh network topology is one of the key network architectures in which devices are connected with many redundant interconnections between network nodes such as routers and switches.
Often, a mesh topology will be used in conjunction with other topologies (such as Star, Ring and Bus) to form a hybrid topology.
Partial mesh topology is commonly found in peripheral networks connected to a full meshed backbone.
www.networkdictionary.com /networking/mesh.php   (350 words)

 The cnet network simulator - topology files
However, more important is cnet's use of a topology file to define the attributes and connections in each network simulation.
Global attributes may be defined in each topology file and affect the execution of the whole simulation.
Each node is connected to the segment by its Network Interface Card (NIC); each NIC's address, as a string of hexadecimal characters, introduces each node's connection to the segment.
www.mcs.vuw.ac.nz /technical/software/cnet/topology.html   (628 words)

 Guide to network topology - how computers get connected
The most popular network method because of the low price of the network cards, reliability and speed; but it can be a pain to run the wires through your home.
Alternative networking technologies are often used to supplement a primary network.
This is the relative cost not just for the network adapters, but the relative cost of hubs, access points, repeaters, or other things needed for a complete home networking solution.
www.homenethelp.com /network/index.asp   (731 words)

 Project Octopus: Network Topology Discovery   (Site not responding. Last check: 2007-10-09)
In large, constanly growing networks, it is difficult to tell how exactly the network is layed out.
This document describes techniques to accurately determine the exact layout of a network using few assumptions about the network architecture and simple tools.
This page describes several techniques to determine the topology of a network within the domain.
www.cs.cornell.edu /cnrg/topology_aware/topology/Default.html   (164 words)

 VIN Network Topology
The VIN network operates similar to a standard IRC network.
The type of information that will be exchanged on future networks has undergone a radical change in the last few years.
A full implementation of the client level in Java, so that the full capabilities of the network will be available to mathematical scientists, irrespective of the power of their local computing systems.
www.cecm.sfu.ca /~loki/Papers/ERP/covering/node30.html   (631 words)

 Global Crossing
Our wholly owned global IP network features interoperable legacy and advanced IP service platforms that are managed and operated end-to-end.
Everything, including our business orientation, market planning, sales and employee base, is driven around a clear, focused, disciplined market strategy designed to drive near and long-term value to our customers, who we serve by delivering solutions and products and value our competitors cannot easily duplicate.
Our global sales force, dedicated customer support, and network operations organizations are second to none and provide a consistent, worldwide customer experience.
www.globalcrossing.com /xml/network/net_map.xml   (399 words)

 Network Topology
New customers can be added to the network without any noticeable hit on overall speed.
DSSS was invented years ago by the US military as a secure, robust, and reliable means to communicate across great distances.
Using SNMP, Nikola can be alerted to any potential problem on their network.
wireless.nikola.com /Broadband_Advantages.htm   (231 words)

 The Geography of Cyberspace Directory - Network Topology Maps
A useful collection of old maps of computer networks, from the early 1990s collected by the Technical University of Berlin.
The First Maps of the Internet poster by Peacock Maps presents a range of maps and diagrams of ARPANET and other packet networks from the 1970s and 80s.
Rocketfuel: An ISP Topology Mapping Engine, Department of Computer Science and Engineering, University of Washington.
www.cybergeography.org /topology_maps.html   (350 words)

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