Tag Archives: LAN

How To Manage A Computer Network

Today it is almost inconceivable for a company that do not have computers or a building or a high-tech company. If a company more than one computer, usually are linked in a LAN. These networks may be more or less sophisticated and cheaper or more expensive. Companies invest a lot (both in terms of time and money) on a local network, as there are many benefits that a local network, a business meeting and how it should be administered.

Some companies use a local network, so they depend heavily on the job forever. If the failure of the corporate network, you can see all the people talking in the hallways because they cannot do their job. This means that large losses for the company and creates risks to workers. All companies should consider their local networks, an important advantage and downtime must be avoided. This places high demands on the network of staff in these networks of approximately 100% of the clock is ticking.

The benefits of network management software
An important advantage of the installation and maintenance of LANs is the opportunity to improve communication and collaboration between employees and customers to create.

Security considerations: security of local area network can be an obstacle for aid and suffer. global security is an advantage, as it provides a central strategy for improving access and the safe handling and disaster. All information will be protected in the design and implementation of network security solution. In addition, networks of computers in the network create a security risk, and that makes it technically possible for someone too many computers on the network once access.

Economic considerations: the installation of a LAN is a relatively expensive project. Servers, cabling, switches, routers and software can be expensive and cannot be purchased without professional advice. Continued use of the secure network, and resource intensive and can be expensive.

Surprisingly, a LAN has a number of cost savings. Share resources avoid the need to buy for each device. Even more important is the security offered by the Internet. Data loss can be costly for society and in some cases, the chief of the cases to a complete stop. Network Equipment Administration should require a consistent routine data backup with regular checks on the quality of data – a practice that company huge sums of money in case of failure will save.

Computer network management: preliminary analysis of phase
The first phase of the computer network management is the source of the problem of identification (a preliminary study various options for different sizes can be considered useful) and the definition of the requirements. Examples of what is necessary to assess other network operating systems, messaging systems and other applications. The choice of hardware should also be considered. This is usually to define what the system should do, not what we should aspire to.

Computer network management: Design

The design objective is to determine how the requirements of the specification requirements. The current approach is too large and complex projects, which is broken into smaller, more manageable subprojects.

Computer network management: The Implementation phase

This phase includes the physical installation of the LAN. The cable is passed, it installs the software and computers and other equipment are created.

Network Computer Management: Integration and System Test

In this phase, the implementation of the network starts and routines adapted to the users and operators. The system should be tested, both to ensure the system meets the requirements of the specification and sufficiently stable for the central role of the organization.

Network Computer Management: Operation and Maintenance

Local networks are complex operating system routines. That is because it can have serious consequences in case of malfunction or unauthorized access of people to the system. Many companies have the care of employees is dedicated exclusively to the implementation and maintenance of computer networks, to drink.

Network Computer Management: Tools
Although the organization cannot be managers must also monitor the network for more than eight hours a day. In fact, some of the worst problems that can occur with nets during the night, when nobody can do in the network. With network management tools of quality, the organization can be sure that problems will be given to prevention and clean – and your network administrator for a moment the notice shall be served as an extraordinary error.

Computer Networking – A Brief Introduction

Data communications and computer networking is a very significant part of data technology. Today, all businesses in the world desires a computer communications mesh works well, very fast and flexible get access to to data. Imagine no connection scheme at universities, clinics, informative organisations and multinational associations, the dispute is to broadcast with each other. In this item you will discover the straightforward recount of a computer network. The reason of this item is persons who desire the connection mesh of information, measures and networks.

Connecting to the mesh gear and components. For exchange of data and assets between two or more computers in the mesh is known. There are distinct kinds of computer systems for example LAN, MAN, WAN and wireless networks. The major flats are engaged, the infrastructure of a computer center, swap, router and modem, get access to issue and mesh business card and mesh cable.

LAN entails localized locality mesh and a mesh in a room in a construction or on a mesh of a little locality called “LAN. Man is for the Metropolitan Area Network and encompasses the mesh between two agencies in the city. WAN Network wide locality and manage not realise the attachment between two computers or more between the two towns and two nations and continents.

There are distinct topologies of computer networks. A personal topology characterises conceive or the conceive of a network. These topologies are celebrity topology, coach topology, mesh topology, celebrity topology, coach, etc. attached in a celebrity topology, each computer exactly into a mesh to a centered hub or swap, as we understand it. If all the computers in a celebrity topology is not awkward leverage on other computers on a network.

There are distinct measures and apparatus on your network. The most widespread benchmark for Ethernet LAN. key apparatus in a computer mesh is a hub, swap, router, modem and get access to issue, router, etc. These are two distinct mesh attachments, ordered and physical. All communications on the Internet is founded on the router. Hub / swap to the computers on the mesh can use.

Types Of Telecommunications Networks

ETKjide Area Networks. Telecommunications networks covering a large geographic area are called remote networks, long-distance networks, or, more popularly, wide area networks (WANs).

Networks that cover a large city or metropolitan area (metropolitan area networks) can also be included in this category. Such large networks have become a necessity for carrying out the day-to-day activities of many business and government organizations and their end users.

Thus, WANs are used by manufacturing firms, banks, retailers, distributors, transportation companies, and government agencies to transmit and receive information among their employees, customers, suppliers, and other organizations across cities, regions, countries, or the world.

Local Area Networks. Local area networks (LANs) connect computers and other information processing devices within a limited physical area, such as an office, a building, manufacturing plant, or other work site.

LANs have become commonplace in many organizations for providing telecommunications network capabilities that link end users in offices, departments, and other work groups.

LANs use a variety of telecommunications media, such as ordinary telephone wiring, coaxial cable, or even wireless radio systems to interconnect microcomputer workstations and computer peripherals. To communicate over the network, each PC must have a circuit board installed called a network interface card.

Most LANs use a powerful microcomputer having a large hard disk capacity, called a file server or network server that contains a network operating system program that controls telecommunications and the use of network resources.

LANs allow end users in a work group to communicate electronically; share hardware, software, and data resources; and pool their efforts when working on group projects.

For example, a project team of end users whose microcomputer workstations are interconnected by a LAN can send each other electronic mail messages and share the use of laser printers and hard magnetic disk units, copies of electronic spreadsheets or word processing documents, and project databases.

LANs have thus become a more popular alternative for end user and work group computing than the use of terminals connected to larger computers.

Internetworks. Most local area networks are eventually connected to other LANs or wide area networks. That’s because end users need to communicate with the workstations of colleagues on other LAN’s, or to access the computing resources and databases at other company locations or at other organizations.

This frequently takes the form of client-server networks, where end user microcomputer workstations (clients are connected to LAN servers and interconnected to other LANs and their servers, or to WANs and their mainframe super servers).

Local area networks rely on internetwork processors, such as bridges, routers, hubs, or gateways, to make internetworking connections to other LANs and wide area networks.

The goal of such internetwork architectures is to create a seamless “network of networks” within each organization and between organizations that have business relationships.

such networks are designed to be open systems, whose connectivity provides easy access and interoperability among its interconnected workstations, computers, computer-based devices databases, and other networks.

The Internet. The Internet is the largest “network of networks” today. The Internet (the Net) is a rapidly growing global web of thousands of business, educational, and research networks connecting millions of computers and their users in over 100 countries to each other.

The Internet evolved from a research and development network (ARPANET) established in 1969 by the U. S. Defense Department to enable corporate, academic, and government researchers to communicate with E-mail and share data and computing resources.

The Net doesn’t have a central computer system or telecommunications center. Instead each message sent has an address code so any computer in the network can forward it to its destination.

The Internet doesn’t have a headquarters or governing body. The Internet society in Reston, Virginia, is a volunteer group of individual and corporate members who promote use of the Internet and the development of new communications standards or protocols.

These common standards are the key to the free flow of messages among the widely different computers and networks in the system.

The most popular Internet application is E-mail. Internet E-mail is fast, faster than many public networks. Messages usually arrive in seconds or a few minutes, anywhere in the world. And Internet E-mail messages can take the form of data, text, fax, and video files.

The Internet also supports bulletin board systems formed by thousands of special interest groups. Anyone can post messages on thousands of topics for interested users to read. Other popular applications include accessing files and databases from libraries and thousands of organizations, logging on to other computers in the network, and holding real-time conversations with other Internet users.

13.3-inch Display on Toshiba Portege M800 Computer

The Toshiba Portege M800 (Model D3311) Notebook is equipped with 2.0 GHz Intel Core 2 Duo Processor T5800 with 2-MB L2 Cache, 667 MHz FSB featuring Mobile Intel 965GML Express Chipset Mainboard,batteries and offers 2-GB DDR2 667 MHz SDRAM, 250-GB 2.5-inch 5400 rpm hard drive with anti-shock feature and a 8X Super Multi Dual Layer (8.5 GB) DVD Writer.

And whether youre on the move or sat at a desk, the Toshiba is a easy companion. The fine, glossy display might lack a little smartness, but the colour reproduction and great contrast is ample reward.

The Toshiba Portege M800 Notebook PC is equipped with 13.3-inch (33.7 cm) WXGA Widescreen Active Matrix LCD TFT display with Clear SuperView technology ( Toshiba nb100 Battery) powered by Integrated Intel Graphics Media Accelerator GMA X3100 Graphics Chipset with 256-MB shared video memory providing maximum of 1280 x 800 pixels screen resolution with 24-bit 16.7 million colours.

The Intel GMA X3100 graphics chipset integrates DirectX 9.0 and OpenGL compatible games unleashing high performance graphics one need for playing the current games titles on Notebook Computer PC.

Toshiba Toshiba Portege M800 Laptop Computer PC comes with Microsoft Windows Vista Home Premium operating system preinstalled, Toshiba Satellite a105-s4000 Battery and accompanied driver CD contains drivers for both Linux and Windows operating system. The Notebook Computer features spill resistant keyword and touch pad with 2 click buttons and one scroll button.

Weighing about 1.89 Kgs without battery pack, the Toshiba Portege M800 Laptop PC offers integrated Intel PRO/Wireless 3945ABG WiFi 802.11a/b/g wireless LAN connection, integrated 10/100/1000 Ethernet LAN connection, and basic 56kbps V.92 fax/modem card for data connectivity. The Laptop also features integrated advance Bluetooth v2.1 wireless connection.

The Intel GMA X4500MHD stumbled through our lightest Crysis benchmark at a rate of just 6fps. The 3700mAh battery cripples the M800s stamina, too. Just short of three hours in light use puts the Toshiba well behind the rest of the Toshiba Satellite l350 Battery pack.
Its a shame because the Toshiba has much to offer.

Toshiba Protege M800 is also equipped with integrated 6-in-1 Bridge Media Slot which supports SD Media, Memory Stick Memory Stick Pro, Multimedia Card, XD-Picture Card and it comes with built-in high quality Herman/Kardon Speakers which are Cinematic 3D 24-bit surround sound capable allowing SRS360 degrees 3D stereo sound effect with 5.1 tracks.

Other features of the Toshiba Portege M800 Laptop PC include 4 USB v2.0 fast ports (2 on each side), ExpressCard/54 slot, touch pad with 2 click buttons and one scroll button, PCMCIA One Mini PCMCIA Slot compliance support type, Inbuilt Audio AC97 Stereo Sound With 3D Sound effects along with built-in stereo speakers and HDMI digital out port connection.

Toshiba Portege M800 Laptop Computer also offers integrated Biometric FingerPrint Card Reader with Security software suite for data and system security and integrated 1.3 Megapixel Webcam with integrated mike built into LCD bezel for a hassle free audio-video chat experience.

Windows Vista Home Premium edition preinstalled Toshiba Portege M800 is comes with 6-cell Li-Ion 2400 mAh standard Toshiba PA3206U Battery, which can provide upto 3.5 hrs backup without WiFi connection (1.5 hrs with WiFi)

I/O Ports

4 x USB v2.0 compliant 4-pin connectors (2 on each side)

ExpressCard 54mm

IEEE 1394 (FireWire) integrated port

VGA port for external monitor

RJ-45, Ethernet

RJ-11, fax/modem

Microphone-in

Headphone-out

S-Video TV-out

PCMCIA Card Slot

Toshiba Portege M800 Notebook Specs :

Intel Core 2 Duo Central Processor T5800, 2.0 GHz

2-MB L2 Cache, 667 MHz FSB

Mobile Intel 965GML Express Chipset Mainboard

1-GB DDR2 533 Mhz SDRAM (Maximum 2-GB)

250-GB 5400 rpm SATA hard drive

8X DVD Super Multi Dual Layer (8.5 GB) DVD Writer

Display & Graphic

13.3-inch (33.7 cm) WXGA Widescreen Clear SuperView Active Matrix LCD TFT display

Integrated Intel Graphics Media Accelerator GMA X3100 Graphics Chipset with 256-MB shared video memory

1280 x 800 pixels resolution

Network & Communication

Integrated Intel PRO/Wireless 3945ABG WiFi 802.11a/b/g Wireless network connection

Integrated 10/100 Fast Ethernet LAN

56Kbps V.92 Data/Fax Modem

Integrated Bluetooth v2.1

Other Features

Microsoft Windows Vista Home Premium Edition

Integrated 1.3 Megapixel Webcam

Integrated microphone built into LCD bezel

6-in-1 Media Card Slot

Biometric FingerPrint Card Reader with Security Suite

Integrated SRS Surround Speakers

Toshiba spill resistant keyword

Touch pad with 2 click buttons and one scroll button

PCMCIA One Mini PCMCIA Slot compliance support type A

Audio AC97 Built-in Stereo Sound With 3D Sound effects

Li-Ion 6-cells general Toshiba Satellite m308 Battery, 2400 mAh/cell, Upto 3.5 hrs backup

Dimensions: (WxHxD): 315 21.8 (minimum) 32.6 (maximum) 234.3 mm

Weight: 1.89 kilogram with battery power pack

Price and Availability
The spec is good peculiarly given the price. An Intel Core 2 Duo P8400 sits alongside 4GB of DDR2 memory, and the 320GB hard disk ably swallows video and music files. Performance is a little behind similar laptops, but 1.13 is even snappy enough for most tasks. You can forget gaming, though.
The Intel Core 2 Duo Central Processor T5800 powered Toshiba Portege M800 Laptop PC is available in India for the price of Rs. 52,900/- with one year warranty. Visit www.pc.toshiba-asia.com for more details.

Introduction To Computer Network Architectures

Network architecture means design of computers, devices and media in a network. The computer network can be designed using different ways. The most popular network architectures are described below.

File-Server Network:

In File-Server computer network, a powerful computer having disk with large storage capacity and processing power is installed as central computer. This central computer is known as File-Server, Network Server, Application Server or simply a Server. A File-Server stores and manages files. The data files and software are stored on the Server. The individual computers on a network, called nodes, access the data files and software on the Server. It means that, the File-Server is used to store files and to forward them to nodes that request for them.

Client/Server Network:

Client/Server model is the most popular network model. It is also known as dedicated server model. In client/server network (or arrangement), a powerful computer is used as server. The server controls the functions of network. In addition to control the network, the server also provides a centralized storage area. The software and databases are stored on the server. Different nodes or computers connected to the network can access these software and databases.

All computers (other than computer server) connected in the network are called clients. The clients send requests to the server. Server receives the requests from clients and takes proper actions on these requests. It means that processing is usually done by the server. The results of processing are sent to the clients. Client/Server network may be LAN or WAN.

For example, in a Client/Server network, a database is stored on the Server and the Client computers access the database. The Server portion of the DBMS (Database Management system) is stored on the Server that allows the Clients to add information in database or extract information from database. Similarly, the client portion of DBMS is stored on each Client computer through which request is sent to the Server to access the database. The Server processes the data and sends the result-to the Client computer.

Advantages:

The client/server network has the following advantages.

It reduces the volume of data traffic on the network.

It allows faster response at each node.

It allows using less expensive computers as clients because most of the work is done by server.

Disadvantages:

The main disadvantage of this network is that the entire network is affected if there is any problem in the server computer.

Peer-To-Peer Network:

In peer-to-peer (P2P) arrangement, all nodes (or computers) on the network have equal status. No one has control over others. It means that there is no central computer to control other computers on the network. Each computer stores files on its own storage devices and has its own peripheral devices. The users can share each other’s data and devices (or resources) as and when needed. For example, a printer attached with any computer can be used by all computers connected in the network.

Peer-to-Peer network is used in small offices or schools, where primary purpose of the network is to share storage and printers. A Peer-to-Peer network can also include a Server. In this case, a Peer-to-Peer local area network is similar to a File-Server network.

Advantages:

The main advantages of peer-to-peer model are:

It is useful in small offices.

It is easy to design and to maintain.

Disadvantages:

The main disadvantages of peer-to-peer model are:

It becomes slow under heavy use.

It does not provide the security to protect the data stored on computers connected in the network.

Hybrid Network Model:

The hybrid network has combined features of both client/server and peer-to-peer network (or arrangements) models. It also has a server. The users can share the data and software. Similarly, each node can store its own files, programs, and has its own peripheral devices. The users can also share each other’s data and devices. These are the main advantage of hybrid arrangement.