Computer Networking
Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.255.224?

Router (config) #ip subnet-zero
Router (config) #no ip classful
Router (config) #ip classless
Router (config) #ip unnumbered

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Computer Networking
The physical layer, in reference to the OSI model, defines

All of these
None of these
the interface between the X.25 network and packet mode device
data link procedures that provide for the exchange of data via frames that can be sent and received
the virtual circuit interface to packet-switched service

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