Computer Networking
The packets switching concept was first proposed

in the late 1950s for Defense Ministry of US
All of these
in the early 1960s for military communication systems, mainly to handle speech
None of these
in the late 1980s for the Defense Ministry of US.

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Computer Networking
The application layer of a network

defines the user's port into the network
consists of software being run on the computer connected to the network
None of these
establishes, maintains, and terminates virtual circuits
All of these

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Computer Networking
X.21 is

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

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