Article Orange » Hardware

Computer Communication Connections (e.g. Bluetooth, infrared, cellular WAN, WiFi)

anandsoft10 — Mon, 12 Jul 2010 16:55:59 +0000

With the recent advent of wireless communications, several wireless technologies have come to the fore. Notable among these are Blue tooth, Infrared, Wimax, and WiFi. Each of these communications methods is discussed in the article.

Bluetooth:

Bluetooth bandwidth is up to 2.1Mbps for version 2.0, and its range is only 10 meters (30 feet). Devices with a Bluetooth radio and an antenna can speak to each other with little or no preparation. For example, conference attendees can readily transfer files across a table using their Bluetooth-enabled notebooks. You can also send a file to a Bluetooth-enabled printer without downloading drivers. Bluetooth may soon be a standard interface on many cell phones, handheld computers, and even home appliances. Bluetooth operates at 2.4GHz.

Infrared:

Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of microwave radiation. It is a line of sight communication, and any obstruction to line of sight is going to disrupt communication. One every day use of IR communication is your television remote. Most tv remotes use IR communication, and requires line of sight.

Wimax:

WiMAX (short for Worldwide Interoperability for Microwave Accessis), a wireless digital communications system, also known as IEEE 802.16, that is intended for wireless “metropolitan area networks”. WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 – 10 miles (5 – 15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 – 300 feet (30 – 100m).

WiFi:

Wi-Fi (short for “wireless fidelity”) is used for wireless local area networks (WLAN) and fully described in the 802.11 family of specifications. The term Wi-Fi was created by an organization called the Wi-Fi Alliance, which oversees tests that certify product interoperability. A product that passes the alliance tests is given the label “Wi-Fi certified” (a registered trademark). Wi-Fi network can be susceptible to access by unauthorized users if not protected adequately. The activity of locating and exploiting security-exposed wireless LANs is called war driving. Homes or Organizations that use a wireless LAN should secure the WLAN by using Wired Equivalent Privacy (WEP) encryption standard, or Wi-Fi Protected Access (WPA) or MAC address filtering.

Read more about wireless communications at A+ Tutorial

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About website : The web site SimulationExams.com offers exam simulators, and online tutorials for A+, Network+, CCNA, and others. Please visit Simulation Exams website for more information.

Computer Malware – Brief Introduction

anandsoft10 — Mon, 05 Jul 2010 23:53:21 +0000

Malware is a term used to describe any “malicious software” program. Malware includes spyware, adware, tracking cookies, Trojan horses, worms, and viruses.

With the advent of Internet, computer malware programs have become widespread. Malware is a generic term used for any malicious programs such as viruses, Trojan horses, spywares, adwares, worms, etc. These are described briefly in the article.

Virus: A virus is a program that propagates itself by infecting other programs residing on the computer system. Viruses are capable of inflicting serious damage to your system; such as erasing your files or your whole disk, or they may just do lighter things like a pop-up a window with a message.

Worm: A worm can spread itself (without the help of any other program) over the network from one computer to another. Worms replicate without any user intervention, whereas viruses are known to spread through a user. The replication is based on a security flaw in the Operation System or any other applications running on a system.

Trojan horse: A general term, referring to programs that appear innocent, but actually harmful. For example a download that says “birthday greetings” etc. When you download and run it, it may do serious damage to your computer system such as damaging important files or even making the computer unusable. The trojan’s contents could also be a virus or worm, which then spread the damage.

Logic bomb: A logic bomb is signified by uniqueness of occurrence. It can be a virus or Trojan horse, but activated on the occurrence of an event in the future.

Tracking cookies are used to monitor your surfing habits. Sometimes, these are also used for logging keystrokes on your computer, known as Keyloggers.

Spyware and Adware: Spyware is a program that aids in gathering information about a person or organization without their knowledge and relay it to advertisers or other interested parties. Spyware can get in to a computer as a software virus or as the result of installing a new program.

Some frequently asked questions on Security might be found at SimulationExams.com Security+ Exam site.

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About: The web site Simulation Exams offers practice tests for Cisco Certifications, Comptia Certifications, and others. Free tutorials and online questions on CCNA, A+, Network+, and others are available.

Cisco ® Router/Switch IOS

anandsoft10 — Mon, 05 Jul 2010 23:41:20 +0000

Cisco Routers use the Internetwork Operating System(IOS) to control and manage the hardware it is running on.IOS provides the interface between the user and the hardware, enabling the user to execute the command to configure and manage the device using Command Line Interface (CLI.)

Body:-

Cisco® IOS Features:

1. Command Line Interface (CLI)

a. User EXEC Mode

b. Privileged EXEC Mode

c. Global Configuration Mode

d. Sub-Configuration Mode

2. Router Interface Configuration

3. RIP Configuration Using Cisco® IOS™

1. Command Line Interface (CLI)

The CLI is a character or text based interface used to configure or monitor the deviceit supports a command parser, whenever enter is pressed after typing the command IOS parses the command and parameters that you enterd and checks for correct syntax..There are many of accessing the IOS CLI like using console,auxiliary,telnet,web browser and an SNMP mnagment station, but most common way of accessing is through console.

IOS supports three different access modes for interaction with CLI:

1) User Exec—provides basic access to the IOS which includes monitoring and troubleshooting commands

2) Privilege Exec—provides a high-level management access to the IOS,User EXEC mode command can also be used at this mode

3) Configuration—–provides commands for configuring device

1.a User EXEC Mode

The initial access to the CLI is done through this mode. Depending upon the configuration of the router user may be prompted for password. This mode is typically used for monitoring and troubleshooting the device, it has a very limited set of commands.

This mode is identified by the prompt as “>”.

R1>

Here left to the prompt is the device name.

1.b Privilege EXEC Mode:

Giving “enable” command at the above mode lets you enter to this mode. If the privilege EXEC password has been set, then you will be prompted for the password.

This mode is identified be the prompt as “#”.

R1#

In this mode, we can also use the User EXEC mode commands, this mode has more advanced management and troubleshooting commands. We cannot use the commands that modify the device configuration.

1.c Configuration Mode:

Use the “configure terminal” command at Privilege EXEC Mode to enter to this mode, as shown in the below example.

R1#configure terminal

R1(config)#

Prompt at this mode is “(config)#”.

Use the command in this mode to change the configuration of the device.

We cannot view the configuration changes at this mode for this we have to go back to Privilege EXEC Mode by either typing “end” or pressing the control sequence CTRL-Z,

1.d Sub-configuration mode:

Configuration mode has two different levels:

a. Global Configuration mode and

b. Sub-configuration. mode

At the Sub-configuration mode, the commands that are entered affect only specific component of the device.

The following are the different sub-configuration modes and their corresponding prompts

Mode prompt

Interface Subconfiguration mode (config-if)#

Subinterface Subconfiguration mode (config-subif)#

Line Subconfiguration mode (config-line)#

Controller Subconfiguration mode (config-controller)#

IP Routing Protocol Subconfiguration mode (config-router)#

To leave a Sub-configuration mode and return to Global Configuration mode, use the exit command

2.0 Router Interface Configuration:

Interface Naming

Depending on the device interfaces can be either fixed, modular or both.

For Routers that have only fixed interfaces, the interface nomenclature is

type port_#.

If the router as two fixed serial interfaces they are name as serial 0 and serial 1

If the router has modular slots, the interface nomenclature is like type slot_#/port_#.

Each slot begins with 0 and has a unique slot number.within each slot port numbers begin at 0 and move their way up.

For example a modular router with two slots has slot 0 as first slot and slot 1 as second slot. If the first slot has 4 serial interfaces they are numbered from 0 to 3 and the if the second slot has 2 serial interfaces they are numbered as 0 and 1 as shown in the below representation.

First slotàSerial 0/0, Serial 0/1, Serial 0/2, Serial 0/3

Second slotàserial 1/0,serial 1/1

Sub-interfaces

Router’s physical interface can be broken down into multiple logical interfaces called sub-interfaces. Once the sub-interface is created router will treat this logical interface just like a physical interface. Below is the sub-interface nomenclature type port_#.subinterface_#

Example

Sub-interface number 0 on a physical interface “serial 0” is represented as

serial 0.0

Example 1: Here we configure the hostname on a router.

R1>enable

R1#configure terminal

R1(config)#hostname bangalore

bangalore(config)#

bangalore(config)#exit

bangalore#

Example 2: Here we configure the IP address on an interface of a router.

R1>enable

R1#configure terminal

R1(config)#interface serial 0

R1(config-if)#ip address 192.168.1.1 255.255.255.0

R1(config-if)#exit

R1(config)#exit

R1#

3. RIP Configuration Using Cisco® IOS™

RIP is a dynamic routing protocol. Configuring RIP on a Cisco router is given below. The network 192.168.1.0 is enabled for RIP.

R1>enable

R1#configure terminal

R1(config)#router rip

R1(config-router)#network 192.168.1.0R1(config-router)#exit

R1(config)#exit

R1#

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An Overview on Wireless Network Equipment

carvinjane — Mon, 07 Jun 2010 23:27:21 +0000

Most of the people around the world are having computers in their homes. In earlier days, every home contains only one computer professional. In these technology days, at least three to four professionals are in the house and when it comes to sharing time on computer, it is really hectic work. Due to the drastic growth of technology, many people are interested to purchase computers depending upon their requirement. And also they would like to network all those systems. What is a network, network means it is systems of computers or people. It is a pattern that typifies interconnecting lines that branch out from the main part of the system to its corresponding outlets. However, so many people are having much knowledge about this network and having a wonderful network in their homes. Nothing is permanent except change, so your networks need up to date on products, software and equipment also. Nowadays, wireless network is becoming so much popular in every country. In earlier days, if you want network for your systems, you need to have more cables that look to many hassles, and you need more and more the time to spend to connect a network for your systems. And now the wireless network is growing rapidly and here are some of the following products to connect a network.

Wall mounted data cabinet

The data cabinets will play a significant role in the network connections. These data cabinets are also called as wall mounted data cabinets. The main and important work of these cabinets is managing and maintaining a data center, other steps and maintenance of software, efficiency of energy, management of power and management of security data center teams and much more. You need to consider that you have installed a data center that works smoothly.

Patch RJ45 cable

To connect between two or more computers, you need these patches RJ45 cables. Generally, these cables are known as network cables and these are used to connect computers physically. The main important advantage with these cables is it will allow computer to share the date. And now days, these cables will play a significant role

Net gear Ethernet switch

This net gear Ethernet Switch was used for home use and small business in earlier days. However, in these days, these net gear products are designed and enable you to connect all your home computers, laptops and game consoles and many more through the internet. With the help Net gear Ethernet switch, you are able to connect a network between all computers. In order to create a network you will need one of Net gear routers.

Finally, there are so many appliances like RJ45 cat5e, RJ45 network cable, and cat6 patch cable, cat5e Ethernet cable is used to connect a home or small business networks. However, in earlier days purchase these appliances are too much hectic. In these internet days, you can purchase these products from your comfortable home. There are so many manufactures and resellers are having their own web sites, and you can purchase these appliances from their web sites.

If you want to Purchase all Networking Items like wall mounted data cabinet, data cabinets, patch rj45 cable,n etgear ethernet switch, rj45 cat5e, rj45 network cable, cat6 patch cable and cat5e ethernet cable please visit our website.

4G Wireless Internet – Benefits With the Wireless Internet Access

dextonalbert — Thu, 04 Mar 2010 19:15:42 +0000

From the past few days, the internet is changing its way of accessing. Most of the people are interested to obtain the benefits of wireless internet from their comfortable home, office and many other places. This internet will play a significant role in every ones life. It is hard to digest for some people to spend an entire day without checking their emails, blogs and social networking sites. So many people around the world, not just students many more people are using this internet to in all manners of subjects. Depending upon their need, so many of us interested to play online games, watching streaming movies, download music and some essential software and many more. Most of the people are using the broad band internet connection to surf the internet from their comfortable home only. However, the fourth generation internet revolution has changed the entire things and got everything in our hands. Using Laptops is common for every person around the country. However, these laptop users will not have access to the broad band internet connect that will provide sufficient speed. To resolve this issue, they are using wireless internet connection to surf the internet from any place.

Even they can easily surf the internet in a coffee shop, waiting for dentist appointment and many places are there to access the internet effectively. The main feature with this wireless internet is you can download the contents from the internet as the same speeds as they would with a broadband connection. The wireless internet is resolved the issues occurred in earlier day internet surfing. The speed of the internet is three times faster than the broad band and the download speeds up to three to six mega bytes per seconds. With this wireless internet, you can also chat with relatives living in the middle of the country from your favorite beach area. And also you can watch your favorite movie from a hotel room, and also you can send emails to the business partners.This are called the generation of mobile computers.

And you can also use this wireless internet from your comfortable home also. In earlier days, you need to connect your computer with more cable to surf the internet from more than one computer. With this computer, you will surf the internet from more than two computers. Finally, there are some well established and experienced wireless internet service providers are available in the country. They are providing wonderful customer services to their valuable clients. To get more information and price details, please visit their website.
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How to Purchase Discounted Ink and Toner Cartridges Through Online

ronseo3 — Tue, 23 Feb 2010 19:45:34 +0000

Most of the people in America are having their own computer and other accessories like printers and many more.In earlier days,you need worry about ink cartridges,because they are working with some printer ribbons.However, so many people interested to get more quality of printouts, these ink cartridges are introduced in the market.These sealed contents are coming along with the printer.These magazines are quickly running outs depending upon the life cycle of the cartridge.These sealed contents are available in the present market without any discount.Most of the people are interested to purchase these cartridges through online because, they will get some discount on these printer and toner cartridges.There are so many reasons behind the purchase of these good through online is that drop in prices,so many people are having their own printers,demand in supply and many more.In these days,you are to purchase a discounted laser printer for two hundred dollars and ink jet printers at hundred dollars.If the printer market is increasing then obviously, the cartridge market is also increasing.

Most of the sealed cartridges are coming along with the printers,and soon they find that these cartridges are running outs quickly,and they need to purchase another set.And the costs of the magazines are exactly half of the prince of discounted laser printer that means hundred dollars.So the people are thinking that they will get a discounted ink jet printer at the cost of hundred dollars,so why they need to purchase cartridges for their laser printer.Most of the people in America would like to take their color photos on this laser printer.So,they need to change at least once in a month.In such a short time of period they are not interested to replace these cartridges for their printer.As a result,many consumers are looking for economical alternatives to expensive cartridges.However, there are two major groups of the discounted ink and toner cartridges are available in the present market;compatible and manufactured magazines.These compatible ones are so much expensive and they are generic cartridges.And another one is having same specifications as genuine one without a brand name available at one third of the prices of the original cartridges.When it comes to quality of printing, these manufactured cartridges are having poor quality and other has superb and vibrant color quality.

And also with the manufactured magazines,your printer might damage and needed to be serviced.To avoid these issues,so many manufacturers are installed some software along with their printers.If you are inserting third party cartridges,then it gives a message that you need to install a genuine one.And also you will get some discount on these sealed ones,if can purchase from their secured web site.

Ron K Seo is a renowned business writer who has years of experience in writing technical reviews, product descriptions and product feature analysis of Toner Cartridges and Cheap Printer Ink Cartridges. He has won appreciation especially for good writing about Printer Ink Cartridges.

Ink Cartridge and Toner Are Essential to Your Printer

ronseo3 — Tue, 02 Feb 2010 17:15:21 +0000

Around the world, it is observed that lots of people are depending upon the use of the computer and withdrawing the way of writing the pen and paper. And everybody would like to use the printers. There are various types in printers like ink jet, laser jet and the latest one is the graphical mode type. And some of the printers are supporting the feature of multicolored graphical representations. And some of the printers are also supporting the option canvas printing. And it is possible today that you can grab the amazing picture quality just a touch of the button. And quality of print or photograph is depending upon which type of the printer and quality of the cartridges you are using. You need to consider several things before purchasing the appropriate ink cartridges or toners.

The ink which we are using in this printer is semisolid and dries quickly on the paper. If you are particular about the quality of your prints, then you need to purchase the best quality and branded printer ink cartridges. Some of the local brands will be available at inexpensive rates; however, the quality of the print is a really nasty. So, you need to be careful a go for the trusted brand print cartridges. It is also an important thing when you are trying to purchase new one for your printer, you need to know about the model of the printer and serial number of the cartridge. Sometime, the cartridges supplied by the dealer will not be compatible with the printer. The original branded sealed unit is a little expensive and some of the local brands are also having a food quality.

After running out the cartridges, some of the third party manufacturers are selling some refilled cartridges. The whole revenue of the printers manufacturer is depending upon these cartridge sales. So they are inserting on chip that will detect your cartridge, if your cartridges are not a genuine one then it will display a message, and it will stop working. And some of the manufacturers are also making the inexpensive toner cartridges. However, purchasing these printer accessories in retail is expensive, and if you purchase these cartridges in bulk through online with discounts. And there is some esteemed dealer in internet providing various brands of ink cartridges. They are also selling the branded cartridges for discounts. All you need to some search, and you can avail the discount, especially in these festive seasons.

Rono Seo is a renowned business writer who has years of experience in writing technical reviews, product descriptions and product feature analysis of Toner Cartridges and Cheap Printer Ink Cartridges. He has won appreciation especially for good writing about Printer Ink Cartridges.

Must looks while searching a reliable Computer Repair Tampa Company

ntelligentsbs — Mon, 28 Dec 2009 17:07:46 +0000

Computers have become the heart and soul of today’s life. There was a time when computer were being used in some big institutions or firms. But today computers have become the life of any successful enterprise- either it is a small scale or a large scale. But there is a rule of nature that every thing that has once been created or set into work degrades with time. It needs to undergo some repair and computers are no different to this law. If there has been an increased demand for the computers then there has also been increased demand for the Computer Repair Tampa services.

Now let us see what you do when your system gets corrupt. You may go to some Computer Repair Tampa shop and ask for the repair. If you are owning the system in which you just like to play some games or hang out with your friends while chatting then its good. But if you own some serious business, then getting your system repaired from some Computer Repair Tampa shop could be risky. Though these Computer Repair Tampa shop owners may repair your system at very affordable cost but it could be a temporary solution and can also result into some serious defects into your system. In such case it would always be recommendable to have the Computer Repair Tampa services from some reliable source like that of Ntelligent Networks.

Now let see what type of repairing you may require for your computer. It may be concerned with your hardware components or software components. Let us begin with the hardware Computer Repair Tampa services. Your hardware may face problems due to some malfunction of any of the old or degraded component. Boot up loading can also be one of the problems that you may face. So if you consult a reputed Computer Repair Tampa company then you can find an effective and immediate solution to your hardware problems. You can be assisted in the repair of your computer hardware. You can also be helped to buy some of the new hardware components from some reliable source. Installation of some cache can enhance the processing speed of your system.

Corruption of the software components can be some what serious in which only an experienced Computer Repair Tampa Company like Ntelligent Networks can help you. Failure of the software components can be due to some corruption or occurrence of some virus. Such defects need to be dealt with immediate effect or it may result in to complete system failure and loss of data. A reliable Computer Repair Tampa Company will help you to have the latest versions of the softwares in to your system coupled with some of the protective components to prevent any future mishap.

There can also be some problems relating to the networking of your system with some other system. For that you need to look out for Computer Network Tampa Company which could enhance the functionality of your computer networks.

If you are facing any of the Computer Repair Tampa related problem then here is the name of a very well reputed Computer Network Tampa Company i.e. Ntelligent Networks. It will provide you the complete guidance regarding the Computer Repair Tampa and Computer Network Tampa services and will help you to buy the latest hardware and software components from some of the world recognized companies. So if you have any query related to Computer Repair Tampa then visit us at: www.NtelligentNetworks.com

How to search for the computer service provider in Lakeland

ntelligentsbs — Mon, 28 Dec 2009 16:05:01 +0000

If one is asked to describe the computers, the simply reply would be that it is an electronic machine that helps us in various day to day activities. It is one of the most commendable inventions ever made by man that changed the fortune of several individuals and industries. With a booming demand for the computer components there has been a parallel rise in the Computer Services Lakeland industry. If Computer is such a device over which the fate of your business depends then you would never compromise with the quality of the Computer Services. Understanding the need of computers for your business your will always prefer to hire the best Computer Services Lakeland company.

When you feel the desire of going for the Computer Services then you might be looking for the finest service provider. In Lakeland you can find a large number of Computer services provider companies that will offer you a wide range of Computer Services with promising results, but it up to your wisdom to search for the most efficient enterprise for you. Computer Services in Tampa and Lakeland can also be got from some local shops. Such Computer Repair services can offer you an affordable solution if you are ready to compromise and encounter future troubles. For a moment you will be saving few bucks, though they may cost you dearer afterwards. And if you are futuristic and want to have the best service for your computers then you can contact some Ntelligent Computer Service provider. How to look for Computer Services in Lakeland is quite simple. Just follow the few steps and you will find the most reliable computer service Lakeland source.

Check out the Reliability: Check the reliability of a Computer Service provider. Ask its present and past clients. Ask you friends. Enter into the forums and ask for the reviews regarding a particular Computer Services provider in Lakeland. All this will help to have an idea of company’s service criterion and its past performance.

Task force: Look for the efficiency of the task force of the Computer Services Lakeland provider. The computer service provider need to owe an experienced and efficient staff that has the capability to handle and sought out any of the computer relater issues.

Availability of spare parts: You also have to check the quality and the quantity of spare parts available with the Computer Service Lakeland provider. The spare parts need to be genuine and of the updated version. The biased or the obsolete parts may prove worthless to you.

Technical assistance: Check out the technical assistance offered by the Computer Services Lakeland Company. The company needs to offer its clients a divergent customer care service that works with immediate effect with filing of the complaint.

If you are looking for such a reliable and reputed name in Computer Service Lakeland industry then you can take the help of NtelligentNetworks.com. It is a very well reputed name in the Computer Service Tampa and Lakeland industry. It has been serving its clients with full dedication from many years and has been associated with some of the world renowned names like Microsoft, Dell, and IBM etc. From it you can get the best Computer Services available in whole Lakeland and Tampa. For more information you can visit us at: www.NtelligentNetworks.com

What type of Office Projector?

zenosubmi — Tue, 15 Dec 2009 19:58:38 +0000

There are three types of projector technologies available on the market. DLP (Digital Light Processing) and LCD (Liquid Crystal Display) are the most widely available technologies, whilst LCoS (Liquid Crystal on Silicon) is a more recent technology that is becoming more popular.

DLP and LCD have few differences. DLP projectors are subject to the ‘rainbow effect’. This is due to the colour wheel they use to generate an image. This effect means that a very small amount of people will see flashes of solid colour. Faster colour wheels have reduced this substantially. DLP projectors can be a little awkward about where they are placed relative to the screen. LCD projectors are easier to place but also come with their own difficulties. LCD can suffer from ‘screen door effect’, the images sometimes look as though you are looking through a mesh panel. Experts tend to prefer DLP projectors as the black levels and contrast give a better cinematic picture but LCD projectors have a small price advantage.

The other type of Office Projector is LCoS. This is a newer technology than either DLP or LCD and is becoming increasingly popular. The LCoS technology has neither ‘rainbow effect’ nor ‘screen door effect’ and gives outstanding picture quality. However, it does tend to be more expensive than either DLP or LCD.

Another thing to look at is the resolution of the digital projector. SVGA (800p x 600p) and XGA (1024p x 768p) are the most popular. The XGA gives better, sharper text and graphics. SVGA is still available and cheaper than XGA and would give perfectly adequate pictures for the usual PowerPoint presentation. With the increase in wide screen laptops, the resolutions that fit them have changed. WVGA resolution (854p x 480p) matches that of DVD movies. There are other resolutions of similar size that come under the umbrella of WVGA. Many widescreen business projectors have WXGA resolution that matches many 14-15inch laptops. SXGA+ matches the larger computer screens and laptops over 17 inches.

Brightness is measured in lumens and basically, the larger the room the more lumens are required. Contrast ratio for most graphics and text is fine at 400:1 but for movies needs to be more than 1000:1.

Lamps can be quite expensive and they do need to be replaced periodically. Not surprisingly the lamps are rarely covered under the warranty for more than 90 days.

Portability of your Office Projector is something to be considered. Projectors generally weigh about 2-3 pounds but can go up to around 10 pounds.

Zenostore.co.uk is a leading electronics retailer stocking over 6,500 products. For electronics, Zenostore – Online Shopping as You’d Expect………….
Tom Jacobsen is a writer for www.zenostore.co.uk and has worked in the electronics industry for many years.