Computer Networking
End-to-end connectivity is provided from host-to-host in:

Data link layer
None of these
Network layer
Transport layer
Session layer

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Computer Networking
A WATS arrangement

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

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