week10 assignment
- 1. Introduction to How High-speed Dial-up Works the average file size for Web content is getting larger and larger The handshake protocol, as the name implies, begins the conversation that allows data to be sent to and from your computer using the Internet. High-speed dial-up providers can't do anything about the modem handshake, but they can speed up the software handshake. 2011 12 22
- 2. Acceleration Servers you can get the idea of the back-and-forths that need to occur in the handshake protocol before information can be sent or received. high-speed dial-up providers have come up with some pretty clever ways to open up that bottleneck. By loading special software into a server, they turn it into what they call an acceleration server. Once it finds that server, the two machines start talking and exchanging the information you need. 2011 12 22
- 3. File Compression • For text files, including the HTML text of a Web page and the text in an e- mail message, the acceleration server compresses the text on the fly and sends it down your modem line. Typically, text will compress at least 50 percent using on-the-fly techniques. • For image files, including GIF and JPG images on Web pages as well as many banner ads, the acceleration server reads the image from the Web site and recompresses it to reduce its size. Typically, the image file size shrinks anywhere from 50 percent to 90 percent in the process. • In many other files, including video files, Zip files and MP3 music files, compression has already taken place. The acceleration server will not touch these files -- it just passes them through as-is. 2011 12 22
- 4. Filtering and Caching In order for the pop-up to pop, that hidden code must display parameters that tells your machine what size the ad is, where on the screen it should appear, and other details about the ad. These ads take up valuable bandwidth, slowing down the transmission of data to your machine. filtering and caching are the three key steps in dial-up acceleration 2011 12 22
- 5. The Bottom Line HowStuffWorks came up three times faster with high-speed dial-up For the complete results, see the chart below. These advances serve to prolong the life of dial-up Internet and provide an alternative for those who are tired of standard dial-up but 2011 12 22
- 6. Conclusion It would seem that a clever combination of fairly straightforward technologies has helped to overcome some of the speed bumps of dial-up Internet. These advances serve to prolong the life of dial-up Internet and provide an alternative for those who are tired of standard dial-up but not quite ready for the leap to broadband. If these advances continue, dial-up may be here to stay for quite a while. 2011 12 22