Which of the following commands shows capabilities and usable frequencies for the wireless interface wlan0?

Which of the following commands lists IPv4 addresses and MAC addresses of network nodes that the local system has seen on its directly connected IP networks?

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A database application requires a maximum shared memory segment (shmmax) of 2GB (2147483648 Bytes). Which configuration file should be modified to set this kernel parameter permanently? (Specify the full name of the file, including path.)

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Please enter the complete path to the main SysV init process configuration file.