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ExamsHUB.com launches 2 new features: Build your own Tests a

11/13/2009 8:08:36 PM

ExamsHUB.com launches 2 new features: Build your own Tests and Notes
ExamsHUB.com added 2 advanced features to its online platform and making it leader in Online preparation for JNTU Engineering Students and Aspirants. ExamsHUB.com has a fast growing community of more than 10,000 users who are benefiting from the innovative content and features on ExamsHUB.com.

1) Build your Own Tests: "Build Your own test" is a online test generator to help students to create their own tests from different EAMCET subjects and chapters. It allows to choose not only between Maths, Physics, Chemistry but also decide upon any combination of chapters within the question bank. This enables students to generate cross-sectional as well as time restricted practice tests on any subject(s) or chapter(s) you choose.

2) Make your own Notes: Add and View notes functionality is the easiest and quickest way to add, view and edit your ExamsHUB.com Notes for each question. Simply click on any quesiton and view your existing notes, or add new notes right onto ExamsHUB.com platform. This will give users flexibility to add their own notes to existing answers and revise them later.

For more information, please login into www.examshub.com

ExamsHUB.com released online version of Engineering Careers

11/13/2009 8:08:10 PM

ExamsHUB.com released Engineering Careers section which contains career opportunities for engineers, their specialised areas, further education, recruitment opportunities in the private and public companies, salaries, sample resumes and cover letters, etc. We have also included hundreds of companies for each engineering branch which are either recruiting or providing services.

This engineering careers section covers following 6 branches:
1) Civil Engineering
2) Mechanical Engineering
3) Electrical Engineering
4) Electronics Engineering
5) Information Technology
6) Computer Science

We have added information and sample papers on more than 100 companies which are recruiting engineering students. Several number of students, faculty, professionals, colleges and organizations provided help and suggestions for creating this section.

You can subscribe or take one week free trial to this section at www.examshub.com

We have also released 6 printed books for Engineering Careers of each branch in next few weeks.

All the best!

ExamsHUB has released JNTU Exams and Results Calendar

11/13/2009 8:07:04 PM

ExamsHUB.com has released JNTU Exams and Results calendar today.
Please refer to the link at:
http://www.examshub.com/calendar/calendar.asp

You can track all JNTU exam details as well as admission/recruitment tests.

Please provide your feedback on this tool.

ExamsHUB.com releases 2 new products: Hot Jobs Portal and We

11/13/2009 8:06:30 PM

ExamsHUB.com reached two significant milestones today by launching Hot Jobs portal and Web Directory:

1) ExamsHUB.com Hot Jobs Portal (http://jobs.examshub.com/)

ExamsHUB.com's Hot Jobs Website is an online human resource service portal in India. Our emphasis is to provide a simple employment service bringing together jobseekers, employers, vendors, and information. Our team has passion and dedication to help job seekers find a right job and employers a right candidate.

http://jobs.examshub.com/

2) ExamsHUB.com Web Directory and News Portal (http://info.examshub.com/)

ExamsHUB.com's Web Directory specializes in linking to education and student related web sites and categorizing those links. Our editors and trained researchers track all submitted content and categorize or classify Web sites.

http://info.examshub.com/

About ExamsHUB.com:
ExamsHUB (www.examshub.com) is a comprehensive online database offering accurate and reliable solved Question papers, Study Abroad, Free downloads, practice tests and exam techniques for JNTU Engineering Students and Aspirants. Content includes solutions, tips, techniques, and value addition services in selected Universities and Courses.

How DNS IP address can be converted into a normal IP address

11/13/2009 8:04:41 PM

Domain Name System (DNS) is a database system that translates a computer's fully qualified domain name into an IP address.
Networked computers use IP addresses to locate and connect to each other, but IP addresses can be difficult for people to remember. For example, on the web, it's much easier to remember the domain name www.amazon.com than it is to remember its corresponding IP address (207.171.166.48). DNS allows you to connect to another networked computer or remote service by using its user-friendly domain name rather than its numerical IP address. Conversely, Reverse DNS (rDNS) translates an IP address into a domain name.
Each organization that maintains a computer network will have at least one server handling DNS queries. That server, called a name server, will hold a list of all the IP addresses within its network, plus a cache of IP addresses for recently accessed computers outside the network. Each computer on each network needs to know the location of only one name server. When your computer requests an IP address, one of three things happens, depending on whether or not the requested IP address is within your local network:
?       If the requested IP address is registered locally (i.e., it's within your organization's network), you'll receive a response directly from one of the local name servers listed in your workstation configuration. In this case, there usually is little or no wait for a response.
?       If the requested IP address is not registered locally (i.e., outside your organization's network), but someone within your organization has recently requested the same IP address, then the local name server will retrieve the IP address from its cache. Again, there should be little or no wait for a response.
?       If the requested IP address is not registered locally, and you are the first person to request information about this system in a certain period of time (ranging from 12 hours to one week), then the local name server will perform a search on behalf of your workstation. This search may involve querying two or more other name servers at potentially very remote locations. These queries can take anywhere from a second or two up to a minute (depending on how well connected you are to the remote network and how many intermediate name servers must be contacted). Sometimes, due to the lightweight protocol used for DNS, you may not receive a response. In these cases, your workstation or client software may continue to repeat the query until a response is received, or you may receive an error message.
When you use an application such as telnet to connect to another computer, you most likely type in the domain name rather than the IP address of that computer. The telnet application takes the domain name and uses one of the above methods to retrieve its corresponding IP address from the name server. A good analogy is to think of DNS as an electronic telephone book for a computer network. If you know the name of the computer in question, the name server will look up its IP address.

What is a TCP session? Explain how TCP session can be hijack

11/13/2009 8:03:42 PM

"TCP session hijacking" is a technique that involves intercepting a TCP session initiated between two machines in order to hijack it.

In that the authentication check is performed only when opening the session, a pirate who successfully launches this attack is able to take control of the connection throughout the duration of the session.

Source routing
The initial hijacking method used involved using the source routing option of the IP protocol. This option made it possible to specify the path IP packets were to follow, using a series of IP addresses showing the routers to be used.

By exploiting this option, the pirate could indicate a return path for packets to a router under his control.

Blind attack
When source routing is disabled, which is the case nowadays for most equipment, a second method involves sending packets as "blind attacks", without receiving a response, by trying to predict sequence numbers.

Man in the middle
Also, when the pirate is on the same network thread as his two contacts, he can monitor the network and "quiet" one of the participants by crashing his machine or by flooding the network to take his place.

How to hide an IP address?

11/13/2009 8:03:21 PM

The most common method to hide your IP address is to use a proxy server in one form or another. A proxy server is a computer that offers a computer network service to allow clients to make indirect network connections to other network services. A client connects to the proxy server and then requests a connection, file, or other resource available on a different server. The proxy provides the resource either by connecting to the specified server or by serving it from a cache. In some cases, the proxy may alter the client's request or the server's response for various purposes.
There are several implementations of proxy servers that you can use to hide your IP address (in an attempt to remain anonymous on the internet):
Website Based Proxy Servers
A Website based proxy server is a website that provides a form for you to enter the URL of a website that you wish to anonymously visit. When you submit the form the website proxy server makes a request for the page that you want to visit. The machine usually does not identify itself as a proxy server and does not pass along your IP address in the request for the page. The features of these sites vary (ad blocking, javascript blocking, etc) as does their price. Some are free and some charge. Examples of website proxy services are:
o       Proxify.com
Browser Configured Proxy Servers
There are also stand alone proxy servers that allow for you to configure your browser to route your browser traffic through that machine, which then makes a request for a page on your behalf, and then sends you the results. These are usually used at no cost to the user. Since they are accessible to the public these are often quite slow. There are a variety of types of these proxy servers:
o       Transparent Proxy - This type of proxy server identifies itself as a proxy server and also makes the original IP address available through the http headers. These are generally used for their ability to cache websites and do not effectively provide any anonymity to those who use them. However, the use of a transparent proxy will get you around simple IP bans. They are transparent in the terms that your IP address is exposed, not transparent in the terms that you do not know that you are using it (your system is not specifically configured to use it.) This type of proxy server does not hide your IP address.
o       Anonymous Proxy - This type of proxy server identifies itself as a proxy server, but does not make the original IP address available. This type of proxy server is detectable, but provides reasonable anonymity for most users. This type of proxy server will hide your IP address.
o       Distorting Proxy - This type of proxy server identifies itself as a proxy server, but make an incorrect original IP address available through the http headers. This type of proxy server will hide your IP address.
o       High Anonymity Proxy - This type of proxy server does not identify itself as a proxy server and does not make available the original IP address. This type of proxy server will hide your IP address.
Installed Software Proxy Servers
There are a variety of companies and software packages available at either a onetime cost or at an annual subscription. These are usually faster and more reliable than the above proxy servers

What are port numbers?

11/13/2009 8:02:58 PM

Port numbers
A port number is a way to identify a specific process to which an Internet or other network message is to be forwarded when it arrives at a server. For the Transmission Control Protocol and the User Datagram Protocol, a port number is a 16-bit integer that is put in the header appended to a message unit. This port number is passed logically between client and server transport layers and physically between the transport layer and the Internet Protocol layer and forwarded on.
For example, a request from a client (perhaps on behalf of you at your PC) to a server on the Internet may request a file be served from that host's File Transfer Protocol (FTP) server or process. In order to pass your request to the FTP process in the remote server, the Transmission Control Protocol (TCP) software layer in your computer identifies the port number of 21 (which by convention is associated with an FTP request) in the 16-bit port number integer that is appended to your request. At the server, the TCP layer will read the port number of 21 and forward your request to the FTP program at the server.

What is a proxy server?

11/13/2009 8:02:38 PM

Proxy Server
A proxy server is a computer that offers a computer network service to allow clients to make indirect network connections to other network services. A client connects to the proxy server, then requests a connection, file, or other resource available on a different server. The proxy provides the resource either by connecting to the specified server or by serving it from a cache. In some cases, the proxy may alter the client's request or the server's response for various purposes.

How is a IP address traced?

11/13/2009 8:02:20 PM

Tracing of IP address
1.       Find the IP number you wish to check. The format of an IP address is numeric, written as four numbers separated by periods. Each number can be zero to 255.
o       To find the IP of an e-mail sent to you, investigate the message's "headers" by using your e-mail program's "details" or "properties" function. For example, in Outlook Express, select "Properties" from the "File" Menu, or just press ALT+Enter. Next, select the "Details" tab. In Yahoo, click "Full headers" on the upper right hand corner while you see the message. In Hotmail, go to "Mail Display Settings" and set "Message Headers" to "Full" or "Advanced".
2.       Go to a website that will allow you to look up IP address information. Type the IP number in the input box and submit.
3.       Understand that in many situations you will learn a few things about the IP address:
o       Which internet service provider (ISP) the user is using. In some cases this may be the user's company (e.g. Ford.com). In other cases it may be just one of the large ISPs such as ATT or Comcast.
o       The approximate physical location of the user (e.g. Palo Alto, California.)
4.       Recognize that usually you will not learn the actual name of the person doing at that IP address (e.g. Joe Smith). ISPs will typically only release such information under a court order.
5.       Another way--if you are using a Windows computer--to find out some information about someone is to go to Command Prompt (if you do not know how to do that, go to the Start menu, Run, and type "cmd" and press OK) and type in tracert . On UNIX (including Linux and OS X), open a shell and use the command traceroute