Which service uses telephone control messages and signals between the t

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CCNA Interview Questions

CCDA Interview Questions

Question

Which service uses telephone control messages and signals
between

the transfer points along the way to the called destination?

A. Signaling System 7 (SS7)

B. Time-division Multiplexing (TDM)

C. X.25

D. Frame relay

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Re: Which service uses telephone control messages and signals between the transfer points along the way to the called destination? A. Signaling System 7 (SS7) B. Time-division Multiplexing (TDM) C. X.25 D. Frame relay

Answer
# 1

Answer:: A

Signaling System 7 (SS7) uses telephone control messages and
signals

between the transfer points along the way to the called
destination.

Time-division Multiplexing (TDM) has information from
multiple sources

and allocates bandwidth on a single media. Circuit switching
uses

signaling to determine the call route, which is a dedicated
path between

the sender and the receiver. Basic telephone service and
Integrated

Services Digital Network (ISDN) use TDM circuits. X.25 and
Frame Relay

services have information contained in packets or frames to
share

non-dedicated bandwidth. X.25 avoids delays for call setup.
Frame Relay

uses permanent virtual circuits (PVCs).

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