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What is the status of PSTN connectivity from this gateway?

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On the PSTN gateway, a network engineer runs sh isdn status and finds the Layer 2 state of each interface to be “TEI_ASSIGNED”. What is the status of PSTN connectivity from this gateway?
A. The T1 interfaces are established and operational.
B. This information does not indicate the status of PSTN connectivity from the gateway.
C. The T1 interfaces are down.
D. The T1 interfaces are being tested by the carrier.
Correct Answer: C

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