37. Which of the following BEST defines the role of gatekeepers?
A. Transform audio that is received from a telecommunication system into a format that can be used by a different network.
B. Control the set up, connection, feature operation, and disconnection of calls through the data network.
C. Monitor signal activity for a VoIP session, and terminate the session after transmission has completed.
D. Change the route of incoming calls to alternative destinations based on the user's preferred settings and the status of a telephone line when a call is received.
Answer: B
38. Which of the following is the basic process by which an analog signal is converted to digital signal?
A. The analog signal produces sound pressure, which is measured by an A/D converter and transmitted in digital form.
B. The analog signal is processed by a digital transmitter which strips any distortion from the signal and retransmits the signals to digital receiver.
C. The digital receiver detects high and low analog sound levels and uses these levels to recreate new digital signals.
D. The analog signal is periodically sampled and changed to a number of pulses, which are counted and sent as digital numbers.
Answer: D
39. A technician is notified that the network is down in a remote office. Upon arriving the technician finds that the network failed just after an IP telephone was moved to a new location. Upon examination the technician notices that the phone has two network cables plugged into it and both are connected back to the same switch. Which of the following would keep this from causing a network outage again?
A. Spanning Tree Protocol (STP)
B. Common Open Policy Service (COPS)
C. Separation of VLANs
D. RIP
Answer: A
40. Which of the following versions of MPEG compression requires the least processing and is often recommended for stream rates under 1.5 Mbps?
A. MPEG - 1
B. MPEG - 2
C. MPEG - 4
D. MPEG - 7
Answer: A
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