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Chaitanya's Questions & Answers

in Computers & Technology, Computers & Accessories& Operating Systems

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Total Points: 3780

Answers Given: 1854

Questions Asked: 236

Best Answers: 71

Describe the wrapper classes in Java.

Asked by Bablu Dskfl in Computers & Technology at 11:19 PM on November 14, 2008

Chaitanya's Answer

one for each primitive type: Boolean, Byte, Character, Double, Float, Integer, Long, and Short
Byte, Double, Float, Integer and Short extend the abstract Number class
all are public final ie cannot be extended
get around limitations of primitive types
allow objects to be created from primitive types

Answered at 12:02 PM on June 26, 2009

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Centralized Data Warehouse?

Asked by L Prasad in Computers & Accessories at 11:00 PM on January 04, 2009

Chaitanya's Answer

A Central Data Warehouse is a repository of company data where a database is created from operational data extracts. This database adheres to a single, consistent enterprise data model to ensure consistency in decision making support across the company.

A Central Data Warehouse is a single physical database which contains business data for a specific function area, department, branch, division or the whole enterprise. Choosing the central data warehouse is commonly based on where there is the largest common need for informational data and where the largest numbers of end users are already hooked to a central computer or a network.

A Central Data Warehouse may contain all sorts of data for any given period. Typically, a central data warehouse contains data from multiple operating systems. It is built on advanced relational database management systems or any form of multi-dimensional informational database server.

A central data warehouse employs the computing style of having all the information systems located and managed from one physical location even if there are many data sources spread around the globe.

Answered at 9:12 PM on June 24, 2009

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What are the differences between OEM and Retail versions of processors?

Asked by kaushal Kish in Computers & Accessories at 10:21 PM on December 09, 2008

Chaitanya's Answer

It can be hugely important depending on the componant, particularly CPU's, which are graded before going into the distribution channel: Retail Box is highest quality, OEM is lowest... this matters when building an upper end system using say an Athlon-C 266FSB 1GHZ +, the retail box will assure you get one with copper interconnects. This said, the importance diminishes with other componants, i.e., sound card etc. as far as video is concerned it is always a good idea to look at the software bundle that comes with a retail box vs. the OEM part, which is typically just hardware w/drivers.

Answered at 11:17 PM on December 09, 2008

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Is the response.sendRedirect ends the existing session?

Asked by Ankit Gupta in Computers & Accessories at 9:23 AM on January 24, 2009

Chaitanya's Answer

By using the send redirect i think the sesssion should expire. Because there is no session objects are available for redirected page and no request or response objects are available. If write the code in the redirected page like

<%=request.getParameter("") %>;it will print null.

for sending a page to out of scope only we are using redirect otherwise u can use forward()method.

Answered at 10:25 AM on January 24, 2009

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I can't hear sound from my speakers. What should I do?

Asked by kaushal Kish in Computers & Accessories at 10:25 PM on December 09, 2008

Chaitanya's Answer

First, please check the volume level on your speakers. Then check that the volume in the "volume control" is turned on throughout all channels. The volume control is usually located on the bottom right side of the desktop next to the clock. Look for the small speaker icon and adjust sound level. Then also check if proper drivers are installed for audio. The CD for these drivers normally comes with the motherboard. If nothing works then only buy new speakers.

Answered at 11:03 PM on December 09, 2008

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Where can one find help with a LaserJet IIIP that is producing an ERROR 52?

Asked by kaushal Kish in Computers & Accessories at 10:17 PM on December 09, 2008

Chaitanya's Answer

HP LASER PRINTER ERROR CODE 52 – INCORRECT SCANNER SPEED ERROR
Is this what you get? Then:

(Apple Personal LW series indicate this error with the two lower lights flashing, QMS PS410 printers with the error light being lit) indicates incorrect scanner speed and is generally the same as an error 51. This is a very common failure on the laserjet IIP/IIIP, Apple Personal Laserwriter, QMS PS410 and other Canon LX engine printers. This error can begin as an intermittent error 51 which can be corrected by pressing Alt- continue (on HP printers) but it's only a matter of time until you can no longer correct it this way.

HP LASER PRINTER 2300 ERROR 52.X

1. A temporary scanner start up error.

2. This can also be the shutter tab on the print cartridge. Replace the toner cartridge.

3. Replace the scanner ass'y.

4. Replace the engine board.

HP LASER PRINTERS 4200, 4300 ERROR 52.XX

1. Printer scanner speed error has occurred.

2. Replace laser scanner ass'y

3. Replace the D.C. controller ass'y

HP COLOR LASER PRINTER 4600, 5500 ERROR 52.XK, 52.XC, 52.XM, 52.XY

1. Error code K - No Black Color.

2. Error code C - No Cyan Color

3. Error code M - No Magenta color

4. Error code Y - No Yellow color

5. Replace laser scanner ass'y

6. Replace the D.C. controller ass'y

Answered at 11:23 PM on December 09, 2008

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Difference between LAN and WAN?

Asked by gilli ... in Computers & Technology at 9:02 AM on December 06, 2008

Chaitanya's Answer

The primary difference between a Local Area Network (LAN) and a Wide Area Network (WAN), besides the technology used, is that generally you have control of all the resources for a LAN, but not for a WAN.

For example, for a single company LAN (not connected to another LAN or to the Internet), that company can provide physical security for the entire LAN and all the connected computers. They can provide background checks for all the people that have access to all of the equipment. They can establish security policies and procedures that can be enforced on all the equipment. All of the threats to the system come from within (assuming adequate physical security).

As soon as the LAN is connected to another LAN or the Internet and becomes a WAN, all of that changes. The company does not know what physical protections have been made to the rest of the WAN, only its small portion. In the case of an Internet connection, they have no idea who might try to access their LAN. The entire threat model changes. Not that any of the threats from the LAN-only environment have gone away, but many more have been added. One can think of the threat profile for a LAN as being a subset of the threat profile for a WAN.

This threat profile is what helps to decide what security measures are appropriate. In terms of network management, within a self contained LAN, there probably is no need to have network management protocols encrypted, or special authentication done for those protocols (unless you are worried that insiders may attempt to "manage" your network for you). On the other hand, you probably do not want your network management protocols to traverse the Internet without protection. Nor do you want your computers on a remote segment to respond to network management requests that are not authenticated.

So, as with any computer system or network, the first steps are to identify what the threats to your system or network are and what needs to be protected. Then you can go about devising ways to provide the required protection.

Answered at 1:00 PM on December 06, 2008

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How secure are peer to peer networks?

Asked by gilli ... in Computers & Technology at 9:06 AM on December 06, 2008

Chaitanya's Answer

Peer-to-peer (hereafter referred to as P2P) communication software allows individual computers to share and swap various types of files. Recently, P2P software has been much in the news due to current and potential lawsuits. Napster, the company that makes software for exchanging MP3s (encoded music files), is being sued for copyright infringement; the recently re-released Gnutella has the potential for exchanging all types of files and may therefore be embroiled in litigation even more quickly than Napster was.

P2P software takes the idea that the Internet is for sharing to new levels. P2P has been described as "an anarchistic threat to the current Internet" (David Streitfeld, The Washington Post, July 18) and Marc Andreesen has called P2P software the most important thing on the Internet in the last 6 years (when Netscape was first released) and a "benevolent virus." Ian Clarke, the creator of FreeNet, says, "People should be free to distribute information without restrictions of any form."

Even protected code is not safe. Programs like AOL Instant Messenger, or any other P2P software, can be reverse engineered and released as Open Source software. These programs can then be released for any operating system platform. This also gives malicious hackers the ability to change the software code so that it can be used for other purposes. This requires a great deal of programming knowledge and skill, but can still be done.

The first obvious concern is the liability of copyright infringement. Even though all of the companies that produce and release P2P software issue warnings regarding the illegalities of downloading copyrighted materials, simply releasing the software makes those illegal acts possible. Some P2P software contains security warnings during the installation of the software and enables default settings to protect the naïve consumer and their computer. But armed with some simple knowledge of the Internet and its protocols, even a beginner criminal hacker can cause many security risks to users of this class of software.

More important than any copyright concerns are the potential security concerns for corporations and consumers. For corporations, P2P software threatens:

* *Bandwidth consumption.
* Liabilities and acceptable use violations.
* Undermining of security policies.
* Trojan Horse and virus distribution.
* Disclosure of IP and MAC addresses.
* Telecommuters.

For individual consumers, P2P software represents:

* Disclosure of IP and MAC addresses.
* Disclosure of connection speed.
* File sharing.
* Trojan horse and virus distribution.

Answered at 12:55 PM on December 06, 2008

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How do you change your wep key?

Asked by gilli ... in Computers & Technology at 9:02 AM on December 06, 2008

Chaitanya's Answer

A WEP key is a protection form used in wireless networking. To find it, use a computer that is plugged into your router via ethernet. (basicaly a fat phone cord) click on the network icon on your talkbar, go to advance properties. Your primary DNS is the little # you need to write down. Once you do that, open up your internet browser, in the address bar enter the primary DNS you should've wrote down. ex:192.168.2.1 You should be at a router setup page. Find wireless security somewhere on the page and click on it. Here you may have to enter a password in which case leave it blank. Continue forward and you should be able to see, change, and modify all of your WEP security features.

Answered at 1:04 PM on December 06, 2008

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Where can you find details about DOS networking commands?

Asked by gilli ... in Computers & Technology at 8:59 AM on December 06, 2008

Chaitanya's Answer

There are can be various sites with lots of information on the same:
http://mirror.href.com/thest arman/DOS/DOS7NET.htm
http://www.c omputerhope.com/overview.htm
http: //en.wikipedia.org/wiki/List_of_DOS _commands

Answered at 1:09 PM on December 06, 2008

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