If your ISP can handle 1500 bytes, but you specify 1800 bytes, you might get the 1500 bytes, but then your computer has to tell iTunes, “Hey, I didn’t get those other 300 bytes. That’s great until you tell the computer to transmit packets larger than your ISP can handle. And as you increase the amount of data in a packet, you decrease the number of packets iTunes needs to transmit, which reduces the time it takes to receive the file. Naturally, you want to get all of these things as quickly as possible. Or you want to save on your computer an audio or video guide containing advice to help with personal statement writing. Or you’ve come across a freshly released movie that you planned to watch this Friday night. Suppose, you want to download a song from the iTunes Music Store. The same thing is true with computer data. Everyone knows that the more pieces you need to put the picture back together, the longer it takes. Think of it like a jigsaw puzzle: You go to the store to find a puzzle, and they come in different sizes, ranging from 20-10,000 pieces. MTU stands for “ Maximum Transmission Unit.” Whenever you transmit and receive data in Mac OS X, the data is broken up into smaller pieces (called packets) and then reassembled on the other end of the connection.
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