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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 1011:  Networking

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IV  Ethernet
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 VI  Cables and Wireless
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V  Duplex/Simplex

With the card and driver installed, the next question that may need to be addressed goes something like, "is the card operating at full duplex?" The real question to be answered here is what the heck is duplex versus simplex.

Chances are you have communicated by voice using both. When you make a phone call, and you and the other person you are chatting with can both talk and listen at the same time it is known as Duplex.

If you have ever used (or at least heard) a conversation over radio, where the person transmitting signifies they've completed their thought by saying "over", then the other person responds, that is Simplex or half duplex.

When a NIC can use duplex, email for example can be both coming in and going out at the same time. With simplex, the NIC must switch back and forth between sending and receiving. It may do this so quickly that it appears simultaneous, however it is not.


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IV  Ethernet
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 VI  Cables and Wireless
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