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Converting website names into IP addresses is the main role the DNS servers. It is for our ease and convenience that human readable domain names have been created. Actually these human readable domains that we type are again changed into IP addresses. So in simple words the fundamental job of the DNS is to convert the domain name into its particular IP address and IP address to its corresponding domain name. Both domain and IP addresses have the same task i.e. to open a website. So accordingly it can be just said that a particular IP address cannot be of more than one domain.
DNS Server Types
Recursive & non-Recursive are the two main types of DNS Servers. In a recursive, the client sends queries and receives complete feedback from the ISP’s recursive DNS Servers. This could also result in engaging the servers. A non-recursive DNS is one which provides a record of the domain without engaging other servers. Recursive server is mostly used at lower level such as in LAN networking. While the non-recursive servers are probably used for elite levels because of a higher number of requests, so that it provides partial results without engaging other servers.
Using Chroot network is highly recommended for security reasons. Chroot environment is a process that produces a file that clones the main root system so that if an attacker is cracking the network to reach the root system, he cannot damage the whole system, because he has no access to those files which are not on that network.
There are many issues resulting in the compromising on the DNS Security. Redirection is also a major problem in which an attacker is able to redirect name queries to the DNS servers controlled by him. Flooding one or more DNS servers on a network with recursive queries is a way by which an attacker denies the availability of network services. This is known as Denial of Service Attack. There is a process called foot print in which DNS Zone data could be obtained by the attacker to get information about domain names, computer names and IP addresses.
Advantages of DNS Server
The main advantage of DNS Server is that it is free and fast. One could surf on internet not only safely but also quickly. One can add the DNS domains manually in TCP / IP networks, so it is not only easier but also safer.
When it comes to surf the internet, free and fast DNS Servers are readily available. One can find many free DNS Providers on the internet that could act as a solid rung towards providing the particular DNS server according to requirement. Some of best providers are given below:
SpeakEasy (Seattle, WA, US)
- 184.108.40.206 Read More
In this era of technology mobile phone is requirement of every person and also has positive effects on society. Mobile technology enables you to get connect all over the world through internet and get information of any part of world (breaking news) when it happens. Mobile technology enables you to make fast and informed decisions.
Mobile technology is very useful in many departments of social life and smart phones with capabilities of browsing the internet, audio/video calls, and sharing large files, mobile technology has made it more efficient to communicate and conduct meetings and business. Some Top Selling Phones make good effects on economy of mobile companies.
In these competitors Best Selling Phone gets more benefit due to its sharp and smart features. Mostly mobile phones with highest sale having balance in their prices with features, so they are affordable for every class. Here we are introducing some Best Selling Phones.
- Nokia 5310:
Nokia 5310 is an express music phone. Main body color is grey, red, black or white and about a centimeter thick. It was released in 2007 and it features many music specific features as well as a 2.0 megapixel camera. It comes with 30 MB internal memory, 32 MB system RAM (2MB of heap memory for apps).Its weight is 71 g, it comes with a dedicated audio chip, which delivers better audio quality, as well as video. It has basic organizer functions including a calendar, to-do list, and notes and it can play FM Radio and receive call with the headset’s button.
2. Nokia N97:
It is a smart and stylish model of nokia series with sharp features. It is actually category of those phones which are in highest sale. It made good repute in Top Selling Phones. It is a touch screen mobile phone in the N series by Nokia. It was released worldwide, on 26 June 2009. It comes with a slide-out QWERTY keyboard. Its talk time is 9.5 hours; LCD size is (640×360 px) 3.5 inch. Its weight is 150 g for original. Its Video recording: Up to 3.6 hours (offline mode) and Standby time: Up to 17 days (3G), 18 days (GSM).
Another version on Nokia N97 is Nokia N97 Mini, having some features of N97 but some differences for instance it is downsize than Nokia N97, another difference is top left the big D-pad has been replaced with four arrow keys at right side. Space between keys is also more than original design. It has some similarities with original model i-e 3.2 inch touch screen, 8 GB of storage memory, removal of FM transmitter, and a shorter battery life. Its LCD size is (640×360 px) 3.2 inch. Weight: 138 g for mini .
3. Nokia N95:
The phone was released at the end of March 2007. This is a portable device is a Smart phone produced by Nokia as part of their N series. The N95 has built-in Wi-Fi, with which it can access the Internet, audio/video chat, it also has built-in Blue-tooth and works with wireless earpieces. The N95 includes a built-in accelerometer. Its weight is 120 g and comes with 160 MB Memory, 240×320 px, 2.6 in, TFT LCD display, USB 2.0, Blue-tooth 2.0, Wi-Fi b/g, Infrared and Rear Camera of 5 Megapixel.
Its different versions are:
- N95 NAM (N95-3): designed specifically for the North American market
- N95 8GB (N95-2): N95-2, internally known as RM-320, comes with 8 gigabytes of internal storage and a larger display
- N95 CHINA (N95-5): the N95-5 is targeted at the Chinese market
- N95 8GB NAM (N95-4): with support for North American
- N95 CHINA (N95-5)
- N95 8GB CHINA (N95-6)
The lower cost N95-5 and N95-6 for the Chinese market.
This is also including in phones With Highest Sale. This is a very simple mobile in nokia series. It was launched in late 2003; 250 million 1100′s have been sold since 2003. The Nokia 1100 was designed at Nokia Design Center in California. Its style is not too much modern but it gets popularity among more modern cell phones with more features. It was target among those users who a simple use of cell phone only related to a phone call or SMS just text messages, alarm clock or calendar. Its display is 96 x 65 Monochrome.
“Feross Aboukhadijeh”, who is from Sacramento, California, a 19 year old, talented, student currently at the Stanford University, ended up getting a job request at “YouTube” out of youthful ambition and technical bluster and a bit of luck.
As he tested out “Google Instant”, Google’s new predictive search feature. He was impressed by the feature’s debut, but more inspired.
History of Youtube Instant:
“I bet you I can build ‘YouTube Instant’ in an hour”, he said to his roommate, his roommate took him up on the bet and something that started off as a naïve challenge ended up in the birth of “YouTube Instant”, which was an instant hit!
Youtube Instant Use:
“YouTube Instant” lets people search videos, from a gargantuan YouTube database, in real-time! It lets people type in what they’re looking for, and the engine guesses what that video is.
He spent some more time, the next day, whipping the user interface into shape, and posted his work to his Facebook page, before going to bed that day.
After The New Creation:
The next day the world went wild over his innovation. “When I woke up Friday morning there was craziness,” he said. He found countless emails and messages congratulating him, and a plethora of interview requests, the most notable one being from “Chad Hurley”, the CEO of YouTube, he posted his job offer on Twitter. Feross didn’t believe it at first, and asked if the job offer was on a serious note, but Hurley then sent an e-mail to him to set up a meeting at YouTube’s San Bruno, California, headquarters. The server was flooded by web traffic! Read More
There are an increasing number of equipment manufacturers and technology groups that provide operating systems (OS) for free personal and commercial use without any cost or fee. You are sometimes even free to use them, change their source code and redistribute them as well.
Like Anything that comes for free, do not expect fancy printed manuals and CD-ROMs and technical support. Yet you can count on the community that uses these OS to provide you support through chat rooms and forums and mailing lists.
You will also note that the size of these OS range from 1 to 10 GB so if you don’t have decent broadband connection, paying for a DVD/CD-ROM might seem reasonable. Also if you are not that techie, some of these companies offer helpdesk and support contracts, which can be bought at a reasonable price.
These days, there are three main uses for FreeDOS:
- Running classic DOS games
- Running business software that only supports DOS
- Supporting embedded DOS systems, such as a computerized cash register or till
FreeDOS should run on any standard PC, but if you are new to DOS, we recommend you use a PC emulator to install and boot FreeDOS. You can find PC emulators for all computer platforms (Windows, Linux, Mac.) You can even run FreeDOS using a PC emulator written in Java, right in your web browser!
RxDOS is a fast MS-DOS clone that supports very large disk drives, FAT32 volumes, and Windows 95/98 Long Filenames. its source code is also available free at sourceforge.
ReactOS is a free, modern operating system based on the design of Windows® XP/2003. Written completely from scratch, it aims to follow the Windows® architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux based system, and shares none of the unix architecture.
ReactOS had its origins in an older project known as FreeWin95. FreeWin95 aimed at being binary compatible with Microsoft® Windows® 95. It was founded by Yannick Majoros around 1996. But the development never took off substantially due to endless talks on design and thoughts of following the NT architecture.
The main goal of the ReactOS project is to provide an operating system which is binary compatible with Windows. This will allow your Windows applications and drivers to run as they would on your Windows system. Additionally, the look and feel of the Windows operating system is used, such that people accustomed to the familiar user interface of Windows® would find using ReactOS straightforward. The ultimate goal of ReactOS is to allow you to remove Windows® and install ReactOS without the end user noticing the change.Please bear in mind that ReactOS 0.3.7 is still in alpha stage, meaning it is not feature-complete and is not recommended for everyday use.
OpenSolaris is an operating system (OS), an open source project licensed under CDDL, and a community. The project’s goals are innovation, collaboration, and the extension of OpenSolaris technology.OpenSolaris is free, open source, and well-suited for desktops, laptops, servers, and data centers. The quality requirement of OpenSolaris is perhaps best stated as Production Ready All The Time.
OpenSolaris technical communities maintain kernel and userland consolidations and launch new technology projects. OpenSolaris is developed by communities working in the different projects. Each project focuses on one or more specific areas of the system. The OpenSolaris developer project is sponsored by Sun Microsystems, Inc.
Darwin is the UNIX technology-based foundation of Mac OS X. Darwin integrates several technologies. Among the most important are 4.4BSD-based operating-system services (built on the Mach 3.0 microkernel), the I/O Kit, networking facilities, and support for multiple integrated file systems. Developers can use Darwin to port UNIX/Linux applications and create kernel extensions.
In addition to being part of Mac OS X, Darwin is a standalone, BSD-based operating system. (BSD, short for Berkeley Software Distribution, is a family of UNIX variants descended from Berkeley’s version of UNIX.)Darwin is also occasionally used to refer to the Darwin Streaming Server, also known as the QuickTime Streaming Server (QTSS).