A new layer of wood is added in each growing season, thickening the stem, existing branches and roots.
A linear bus topology consists of a main run of cable with a terminator at each end See fig. All nodes file server, workstations, and peripherals are connected to the linear cable. Requires less cable length than a star topology. Disadvantages of a Linear Bus Topology Entire network shuts down if there is a break in the main cable.
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. Star A star topology is designed with each node file server, workstations, and peripherals connected directly to a central network hub, switch, or concentrator See fig.
Data on a star network passes through the hub, switch, or concentrator before continuing to its destination. The hub, switch, or concentrator manages and controls all functions of the network.
It also acts as a repeater for the data flow. This configuration is common with twisted pair cable; however, it can also be used with coaxial cable or fiber optic cable.
Star topology Advantages of a Star Topology Easy to install and wire. No disruptions to the network when connecting or removing devices. Easy to detect faults and to remove parts. Disadvantages of a Star Topology Requires more cable length than a linear topology.
If the hub, switch, or concentrator fails, nodes attached are disabled.
More expensive than linear bus topologies because of the cost of the hubs, etc. Tree or Expanded Star A tree topology combines characteristics of linear bus and star topologies. It consists of groups of star-configured workstations connected to a linear bus backbone cable See fig.
Tree topologies allow for the expansion of an existing network, and enable schools to configure a network to meet their needs.
Tree topology 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.
One aspect of the Ethernet protocol requires that a signal sent out on the network cable reach every part of the network within a specified length of time.
Each concentrator or repeater that a signal goes through adds a small amount of time. In addition, only 3 of the segments may be populated trunk segments if they are made of coaxial cable.
A populated segment is one that has one or more nodes attached to it.
In Figure 4, the rule is adhered to. 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.
If there is a combination of fiber optic backbone and UTP cabling, the rule would translate to a rule.Upcoming Internal Medicine Board Review Courses. Prepare for the Certification and Maintenance of Certification (MOC) Exam with an ACP review course. This list represents only a tiny fraction of articles available on the New Advent website.
For a more complete list, please see the full index for C or use the search box at the top of this page.. Cabeza de Vaca, Alvar Nuñez - Born at Jerez de la Frontera in Andalusia, Spain; dates of birth and death uncertain Cabot, John & Sebastian - Navigators and explorers.
vol 6 pg 1. A Philosophy of Education Book 1. Introduction. These are anxious days for all who are engaged in education.
We rejoiced in the fortitude, valour and devotion shown by our men in the War and recognize that these things are due to the Schools as well as to the fact that England still breeds "very valiant creatures.".
The Story of My Life. Helen Keller. Part III. A Supplementary Account of Helen Keller's Life and Education, Including Passages from the Reports and Letters of Her Teacher, Anne Mansfield Sullivan, by John Albert Macy CHAPTER III. The Education of Little Tree Questions and Answers.
The Question and Answer section for The Education of Little Tree is a great resource to ask questions, find answers, and discuss the novel. Situating Constructionism. By Seymour Papert and Idit Harel. The following essay is the first chapter in Seymour Papert and Idit Harel's book Constructionism (Ablex Publishing Corporation, ).