Symmetrical Communication
Symmetrical communication links are just as they sound. They have the same download and upload rates. For example, a 500/500 Mbps fiber Internet link offers download and upload speeds of 500 Mbps.
Asymmetrical Communication
Asymmetrical communication links, on the other hand, do not have the same download/upload rates. For example, 25/3 denotes a download speed of 25 Mbps and an upload speed of 3 Mbps. Asymmetrical data communication can make more efficient use of bandwidth than symmetrical data flows, since generally, most users will download more data than they upload
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