Computer Networking
The packets switching concept was first proposed

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

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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
All of these
None of these
the interface between the X.25 network and packet mode device

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