21. Duplicating a layer merges all of the layers and discards anything that is not visible. True or False
True
False

The forerunner to cell phones, pdas, and smartphones was

In my email i got a message it says a quick message and in message details on who its from its says nicole and under nicole is [email protected] -

The open systems interconnection (osi) reference model: defines standards for many aspects of computing and communications within a network. is a generic description for how computers use multiple layers of protocol rules to communicate across a network. defines standards for wireless local area network (wlan) communication protocols. details the advantages and disadvantages of various basic network cabling options.