Computer Networking
Packet Switch Stream (PSS) was introduced in

the US in 1961
None of these
None of these
the US in 1961 (&) the UK in 1981
the UK in 1980

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Computer Networking
X.21 is

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

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