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英国留学生计算机专业论文 [2]

论文作者:www.51lunwen.org论文属性:短文 essay登出时间:2014-08-06编辑:felicia点击率:14593

论文字数:4409论文编号:org201408051325197934语种:英语 English地区:中国价格:免费论文

关键词:拓扑结构计算机系统topologynetwork systemmedium

摘要:本文是一篇计算机留学论文。拓扑结构在现代计算机系统中运用越来越广泛。拓扑结构有很多不同的类型。主要分为两种类型:总线拓扑和点对点拓扑结构,点对点拓扑又包含环型拓扑,星状拓扑,此外点对点拓扑还包含网状拓扑(网格拓扑)。本文简要叙述了拓扑结构是如何操作的。

e does not cause a failure in the network. A Star topology is one which the hub includes all of the intelligence of the whole system and passes directly all network signals. In a Bus topology or Ring topology, a fault segment can take down the whole network. In Star topology if an error occurs in a segment, the remaining segments can work properly. Central terminal of star network has external connections, to the other networks, as well as connections to the nodes of computers in the network.


Mesh Topology (Grid Topology)

On a mesh network, topology can actually change on the fly. No central device directs a mesh network, and no set route is applied to pass signals back and fore between computers. Instead, each computer includes everything it needs to serve as a relay point for sending information to any other computer on the network. So, if any one computer is malfunctioned or faulty, information is redirected to nodes of other computers. It is so called self-healing process.


Network Mediums

Network mediumusedtobroadcast transmissions limits the network speeds, the distance between computers in system, and the networking topology. Network Medium has existed variously for networking, having defined characteristics and suitability for different purposes. Its suitability determined by factors such as bandwidth, cost, east of installation. In generally, it can be divided into two categories-Guided Media and Unguided Media.


Guided Media

At the broadest comprises cables (metallic conductors) and Optical fibre.

Cables subdivide to-

Coaxial cable

Twisted pair cables

Optical fibre subdivides to-

Multimode fibre

Single mode fibre

Coaxial cable

Rarely used in LAN networking nowadays.

Used in cable TV connections and some WAN applications.

Can support long runs due to efficiently of shielding

Can support data rates up to 1Gbps

Twisted pair Cable

Comes in several varieties of cable useful for differing applications

Each pair of wires is twisted together in the manner of DNA strands

Cable core are normally copper, of varying purity

Extensively used in both IT networking and telephony

Advantages

Well known and easy technology

Fairly robust

Good carrying capacity for LAN applications

Disadvantages

Distance limited

Susceptible to data loss through interference

Limited in carrying capacity for WAN applications

Unguided Media

In some cases a slight misnomer, as they can be highly directional

All may be group under the generic term 'wireless'

Uses a single fibre either glass or plastic

Light sources vary from various colours of LED.

Advantages

Secure-almost impossible to tap into fibre optic successfully

Huge bandwidth-already used in multi-gigabit applications

Reasonably robust given careful handling

Disadvantages

Fragile if roughly handled

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