router - a power tool with a shaped cutter, used in carpentry for making grooves for joints, decorative moldings, what layers have to be the same - 1-4, when you send one message out to everybody is called - a broadcast, wan -  a network of computers that are spread a wide geographic area, lan  - a group of computers and associated devices that share the same resources on the same router , throughput - is the actual amount of data that is transmitted over a medium in a given time  , reliability -  a connection that transmits data without causing connection delays or corrupting the data, concurrent connections  - how many or devices can be connected to the same network at one time  , security - How safe the network is from attacks ,

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