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semaphore variable is different from ordinary variable by ?

April 26, 2017different semaphore

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semaphore variable is different from ordinary variable by ?

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->unix system is a)multi processing b)multi processing ,multiuser c)multi processing ,multiuser,multitasking d)multiuser,multitasking ->x.25 protocol encapsulates the follwing layers a)network b)datalink c)physical d)all of the above e)none of the above ->TCP/IP can work on a)ethernet b)tokenring c)a&b d)none ->a node has the ip address 138.50.10.7 and 138.50.10.9.But it is transmitting data from node1 to node2only.