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Computer Interview Questions Answers

Computer Interview Questions Answers

Question - 21 : - Which is better or faster - a Cable or DSL modem?

Answer - 21 : - Both cable and DSL connections are significantly faster than dial-up modem connections. However, there is often debate over which is the fastest of the two. Cable and DSL modems are typically external devices that connect to your computer's Ethernet port. However, a cable modem connects to cable wiring (the same connection used for cable TV), while a DSL modem connects to a phone jack (used for a regular phone line). While these are significantly different connections, they both provide the same "always-on" Internet access for your computer. Both cable and DSL Internet connections have increased in speed over the last few years. As of early 2005, a typical cable connection supports speeds of 2 to 3 Mbps (Megabits per second), while a typical DSL connection supports speeds of 768 Kbps (Kilobits per second) to 1.5 Mbps. This means cable modems usually have the capability to be faster than DSL modems. However, a cable modem shares bandwidth with other computers in the area that also have cable Internet connections. If there are many people in your neighborhood that use the same cable service, it is likely your data transfer speeds will be reduced. DSL, on the other hand, is a direct line to the phone company, and therefore is not affected by other users. So DSL generally offers a more consistent speed. That being said, I have tried both services and found that cable Internet service is faster. I have achieved speeds of 4.3 Mbps with the Time Warner cable connection, while I have not seen anything higher than 1.5 Mbps with the Qwest DSL connection. Also, I have not noticed the cable modem bandwidth drop significantly at busy times of the day, though my transfer rates are definitely faster at night than during the afternoon. From my experience, cable is faster than DSL. Though I should note that DSL companies offer a number of different connection speeds for different prices. If you are already paying for a phone a phone line, a DSL connection may be $15 to $25 cheaper a month than cable Internet service. However, if you don't have a land line (and just use a cell phone), cable is most likely the best choice.

Question - 22 : - What is the difference between functional and technical obsolescence?

Answer - 22 : - These two terms are often used synonymously, and while their meanings are slightly subjective, I would argue they are distinctly different. Technical obsolescence is when a product is no longer technically superior to other similar products. For example, you may buy the latest iPod, which has the most storage and largest screen of any iPod available. A week later, Apple may introduce a new iPod model that has twice the storage, a larger screen, and makes coffee for you in the morning. The new iPod is technically superior than the model you purchased, which means the iPod you bought a week earlier is "technically obsolete." But that does not mean your iPod is functionally obsolete. It still plays music and can download new songs from your computer using iTunes. Functional obsolescence is when a product no longer functions like it did when you bought it. Using the iPod example again, if Apple released a new version of iTunes that only worked with the new iPod, your iPod would be limited in its capability to download and play new music. This would make your iPod "functionally obsolete." Fortunately, companies like to maintain their consumer base. This means they have a strong incentive to support products for several years after their release. In summary, a product may become technically obsolete well before it becomes functionally obsolete. When you buy any type of computer or electronic product, you have to expect that it will soon become technically obsolete. But that should not cause you undue distress. If your iPod still plays all the songs you like and the buttons keep working the way you are used to, who cares if there is a new model out with a bigger screen and a bigger hard drive? It is to your benefit to be content with the product you have instead of always comparing it to the newest model.

Question - 23 : - Which takes up more disk space - images or text?

Answer - 23 : - Even small images take up as much space as several pages of text. This is because each dot (or pixel) in the image has a certain value, which means there are lot of values to store. For example, a bitmap image that is 100 x 200 pixels in size must store 20,000 values. An image that is 640 x 480 must store 307,200 pixels. Text documents, on the other hand, require a value for each character. Since each character takes up one byte of space, a page with 2,000 characters equals 2,000 bytes or about two kilobytes (2K). Compare that to a small 100 x 200 bitmap (.BMP) image, which takes up 124K. Fortunately, JPEG and GIF compression can significantly reduce the file size of images. For example, the file above is reduced to 8K as a JPEG (with a compression ratio of 60%) and 12K as a GIF image. Still, it would take 4 pages of text to equal one small JPEG image and 6 pages or text to equal the same size GIF. If you're developing a Web site, it is important to realize that images will always take up the majority of your space.

Question - 24 : - What is Blind SQL Injection?

Answer - 24 : - When an attacker executes SQL Injection attacks sometimes the server responds with error messages from the database server complaining that the SQL Query's syntax is incorrect. Blind SQL injection is identical to normal SQL Injection except that when an attacker attempts to exploit an application rather then getting a useful error message they get a generic page specified by the developer instead. This makes exploiting a potential SQL Injection attack more difficult but not impossible. An attacker can still steal data by asking a series of True and False questions through sql statements.

Question - 25 : - How can I alphabetize sort the Windows Start menu icons?

Answer - 25 : - Over time the icons displayed in your Windows Start menu will become unorganized, making it much more difficult to find a program you may want to run. Below are the steps on how you can sort these icons in an alphabetic order. Click Start, Settings, and then click Taskbar and Start Menu In the Taskbar and Start Menu Properties window click the Start Menu tab Click the Customize button Click the Sort button

Question - 26 : - What's the difference between e-mail, online chat, and instant messaging?

Answer - 26 : - These are three different ways of communicating with other people over the Internet. To answer your question, I'll explain each method individually. E-mail is a way of sending individual messages to people using an e-mail server to relay the message. Because the server holds the messages for a person until he or she retrieves them, e-mail can be sent whether or not a person is online. One way to send or receive e-mail is to use a mail program such as Outlook Explorer or Mac OS X Mail that will communicate with your mail server. Another method is called Webmail (such as Hotmail or Gmail) that allows you to send messages using a Web-based interface. To send someone an e-mail message using either of these methods, you simply need to know their e-mail address. Online Chat is a way of talking online in realtime with many people at once. Some chat rooms are available via the Web, such as Yahoo! Chat, while others require a separate software program for chatting with other users. Online chat rooms allow multiple users to join in a conversation and see what all the other people are typing. Typically chat rooms are based around certain themes, such as Teen Chat, Macintosh Chat, or Religious Chat. Using online chat, you can meet new people in an anonymous environment. You will need to choose a "screen name" to join a chat room, but the screen name can be whatever you would like it to be. I usually choose something that describes me well, like "Hot Guy." Instant Messaging, or "IMing," is a way of communicating online with a select group of people, usually individually. To instant message someone, you need to know his or her screen name. You can save your friends' screen names in a list called a "Buddy List." In the instant messaging world, your screen name is likely to be more permanent than with online chat. Also, unlike online chat, you need to use an instant messaging program, such as AOL Instant Messenger or MSN Messenger. While online, you can open IM windows with many of your friends at once and type messages back and forth until you realize it's time for bed and you haven't done you homework yet.

Question - 27 : - How do I determine if I have 64-bit vs. 32-bit CPU?

Answer - 27 : - Determine Windows version If you're wanting to determine the type of version of Windows your computer is running follow the below steps for your version of Windows. Keep in mind that a 64-bit processor can be using either 32-bit or 64-bit version of Windows and that a 32-bit processor can only use a 32-bit version of Windows. Microsoft Windows XP users Press and Hold the Windows Key and the Pause key or open the System icon in Control panel. In the General tab of the System Properties window if your computer says Windows XP you're running the 32-bit version of Windows. If the computer is saying Windows XP Professional x64 Edition you're running the 64-bit version of Windows XP. Microsoft Windows Vista users Press and Hold the Windows Key and the Pause key or open the System icon in Control panel. In the System window by System Type you'll have 32-bit Operating System if you're running a 32-bit version of Vista and 64-bit Operating System if you're running the 64-bit version.

Question - 28 : - Is there a term for a "forgotten attachment?"

Answer - 28 : - It seems like it happens all too often. The person who sent you an e-mail forgot to attach the document they said they are attaching. In fact, most of us have probably found ourselves clicking the "Send" button a bit prematurely at one time or another. While I am not aware of any any official terms for forgotten attachments, here are a few options that came to mind: mistachment nontachment untachment vaporfile d'oh! document  

Question - 29 : - What is conversational state ?  

Answer - 29 : - The field values of a session bean plus the transitive closure of the objects reachable from the bean's fields. The transitive closure of a bean is defined in terms of the serialization protocol for the Java programming language, that is, the fields that would be stored by serializing the bean instance.  

Question - 30 : - What is the difference between sending e-mail messages in TEXT mode or in HTML?

Answer - 30 : - E-mail can be sent in either plain text or HTML-formatted. So what exactly does that mean? Well, originally, e-mail was based on just straight text. What you typed was what you saw. With the new HTML-formatted e-mails, you can include pictures, hyperlinks, and other web page characteristics in your e-mails. It's almost like composing a web page within an e-mail message. Unfortunately, if the person you are sending an HTML-formatted message to is using an e-mail program that doesn't support HTML, they'll get a message with a lot of HTML tags (, ,  , etc.) scattered throughout the text. The good news is that most e-mail programs default to the plain text format as long as you don't include any pictures, or other HTML elements. To check your e-mail program's settings, check the Options or Preferences and look for the "Formatting" section. This should tell you how your outgoing messages are being formatted. If there is no such option, you can be pretty sure that you're only sending plain text messages.

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