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

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

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Computer Networking
You are working with a network that has the network ID 10.9.0.0 and contains 73 networks. In the next year, you will be adding an additional 27 branch offices to your company. For simplified management, you want to keep the most possible hosts per subnet. Which subnet mask should you management, you want to keep the most possible hosts per subnet. Which subnet mask should you use?

255.240.0.0
255.248.0.0
255.254.0.0
255.224.0.0
255.252.0.0

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