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Computer Interview Questions Answers

Computer Interview Questions Answers

Question - 1 : - How can I renew or release an IP in Linux?

Answer - 1 : - Coming from a Microsoft operating system to Linux you may be surprised to see there is not an option for ifconfig to release and renew an IP address. Below are two different methods of how this can be done at the command line. ifconfig eth0 down Running the above command would take the eth0 interface (the first network card) down. Which is the same as releasing the IP address from that network card. ifconfig eth0 up After the interface is taken down, typing in the above command would bring that interface back up.

Question - 2 : - What does it mean to "power cycle" a device ?

Answer - 2 : - 1:- Power cycling an electronic device is a technical way of saying "resetting" it. When you power cycle a device, you turn it off and then turn it back on again. Pretty high-tech, huh? Usually, you should let the device sit for a couple seconds after turning it off to make sure the memory in the device is fully cleared before turning it back on. Any electronic device can be power cycled, but the term is frequently used with cable modems, DSL modems, and routers. This is because small internal errors in these devices can prevent them from functioning correctly. Resetting them typically fixes the errors and allows them to work correctly again. 2: - If the drive only says "CD-ROM" or "DVD-ROM" then it probably does not burn CDs or DVDs. If it says CD-R, then it can burn recordable CDs and if it says CD-RW, it can write and rewrite to rewritable CDs. If the drive says DVD-R or DVD+R, it can burn DVD-R or DVD+R discs. If it says DVD-RW or DVD+RW, then it can burn rewritable DVDs. Drives that can burn CDs and read DVDs are often referred to as "Combo Drives" by many PC manufacturers. Apple Computer uses the term "SuperDrive" to refer to drives that can read and write to both CDs and DVDs.    

Question - 3 : - What is credentials ?  

Answer - 3 : - The information describing the security attributes of a principal.

Question - 4 : - What are the two broad classes of middleware?

Answer - 4 : - General middleware Service-specific middleware.

Question - 5 : - What is context attribute ?  

Answer - 5 : - An object bound into the context associated with a servlet.  

Question - 6 : - What is data ?

Answer - 6 : - The contents of an element in an XML stream, generally used when the element does not contain any subelements. When it does, the term content is generally used. When the only text in an XML structure is contained in simple elements and when elements that have subelements have little or no data mixed in, then that structure is often thought of as XML data, as opposed to an XML document.

Question - 7 : - What are computer viruses and how can I protect myself from them?

Answer - 7 : - A virus is a program or file which can do a variety of harmful things to your computer. Things like causing your computer to crash, creating tons of random files, or worse yet, deleting files. Most viruses can replicate themselves, which can be a big problem if they get on a computer network. To protect yourself from viruses you should make sure you have an anti-virus program installed on your computer such as Symantec Anti-Virus, or McAfee Virus Scan. The most common way to get a computer virus is through an e-mail attachment. So it's best to not open any file that is questionable until you find out for sure that it's safe.

Question - 8 : - Is it possible to convert a raster graphic into a vector graphic?

Answer - 8 : - A raster graphic, which is made up of a specific number of pixels cannot be translated into a vector graphic, an image made up of paths. That being said, some programs like Macromedia Flash can create paths out of raster graphics so that they can be manipulated as vector images. This conversion typically reduces the image's size significantly, but different areas of the image are approximated, giving the image a stained-glass look. While it is possible to create a vector image (i.e. an EPS file) from a raster graphic (i.e. a JPEG image), an exact conversion is not possible. Because of the approximations made in the conversion process, a scaled up vector version of an original raster graphic would most likely look worse than just scaling the raster graphic itself. A quick tip if you're using Photoshop -- increasing the image size by 10% at a time often yields better results than just scaling the full amount at once.

Question - 9 : - What does the "NT" stand for in Windows NT?

Answer - 9 : - The NT in Windows NT stands for "New Technology." Windows NT was built with primarily the same interface as Windows 95, but included new technology such as preemptive multitasking and was the first 32-bit version of the Windows operating system. Some argue that because of the new networking options included with Windows NT, the abbreviation stands for "Networking Technology." However the official meaning of NT, according to Microsoft, is "New Technology." Windows NT was originally developed to be a a reliable and scalable operating system for businesses. However, the NT kernel later became the foundation of Windows 2000 and then Windows XP, which is available in both Home and Professional versions.

Question - 10 : - What is the difference between Firewire 1394a and 1394b ?

Answer - 10 : - Firewire is a high-speed digital interface that comes in two varieties - 1394a (or just 1394) and 1394b. The 1394a standard (Firewire 400) supports data transfer rates up to 400 Mbps and uses a 6-pin connection. The 1394b standard (Firewire 800) can transfer data up to 800 Mbps and uses a 9-pin connection. An 6-pin to 9-pin adapter can be used to plug a 1394a cable into a 1394b port, but the speed will be limited to 400 Mbps.

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