Computer Networking
Intranets and extranets can use their network fire walls and other security features to establish secure Internet links within an enterprise or with its trading partners. Select the best fit for answer:

Network operating system
Network Server
OSI
Virtual Private Network

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Computer Networking
MAC is

network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued to ISO.
a method of determining which device has access to the transmission medium at any time
None of these
a method access control technique or multiple-access transmission media

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