Wednesday, April 13, 2011

CrazyEngineers Forum - Computer Science & IT Engineering

CrazyEngineers Forum - Computer Science & IT Engineering

" Firewall " & " Ethernet Frame "

Posted: 12 Apr 2011 08:31 PM PDT

:confused::confused:

Firewall
1) Are there any methods available to setup filter ( firewall ) to prevent dangerous information
flows by datagram and connection ??

Ethernet Frame
2) How exactly the mechanism works when request to output stream by an application is
transformed to an ethernet frame ?? ( ie in short this method is some how related with focus
on data tranform at each layer )

How to Post variables to url using function in php?

Posted: 12 Apr 2011 07:37 PM PDT

I have a problem in php
basically if we want to pass post variable to a url using php we add

<form action="url">
</form>

But i want to pass it to url using function

for eg

function manish($_POST)
{
$url="http://example.com?";
$url.=$url.$_POST;
}

any idea how to do this?

TCP end to end principle implementation on basis of IP

Posted: 12 Apr 2011 04:43 PM PDT

:confused::confused:End to End principle :(:(:(:(
According to the end-to-end principle, protocol features are only justified in the lower layers of a system if they are a performance optimization, hence, (TCP) retransmission for reliability is still justified, but efforts to improve TCP reliability should stop after peak performance has been reached. (WIKI defination )

Can some one illustrate scenarios where end to end argument is not effective as a solution w.r.t current internet usage

How Opera Turbo Works?

Posted: 12 Apr 2011 05:43 AM PDT

I've Opera 11.1 and it features the 'turbo' mode for slow internet connections. When turned on, the Opera Turbo compresses the images and makes the loading very fast. I've a little idea of how this works and look forward to receiving well informed comments on how this mode works.

Typically, when you access any page, the browser will start fetching images from the server. With the Opera Turbo, the images will first be downloaded to Opera's servers and then compressed. The images will then be served to the browser.

I look forward to more technical responses about this mode from CEans :)
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