Computer Networking
In OSI network architecture, the dialogue control and token management are responsibilities of

data link layer
session layer
transport layer
network layer
None of these

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Computer Networking
A WATS arrangement

is never less expensive than flat-rate service
None of these
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long

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