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Exam : Telecommunications
　　　　　　　　　Industry Association
　　　　　　　　　TT0-101
Title : convergence technologies professional

1. Which of the following is a common characteristic of circuit-switched networks?
A. A call uses multiple circuits, releasing them during periods of silence for maximum efficiency.
B. A call has exclusive use of the entire circuit for the duration of the call but is inherently expensive.
C. A call can be completed without the need for any signaling because it uses PSTN circuits instead of TCP/IP.
D. A call has a very robust set of Quality of Service (QoS) options that allows it to overcome congestion and latency problems.
Answer: B

2. Users are reporting problems with voice delays on telephone calls on the corporate Voice over IP (VoIP) network. Which of the following is a possible cause of this problem?
A. Large data packets are causing the voice packets to exceed their delay budget.
B. Echo cancellation has been enabled on the voice coders without configuring phase shifting.
C. The destination number is not contained in the local dial plan, forcing the gateway to do a recursive number lookup.
D. The voice codec is unable to properly compress the voice stream into packets because the sampling rate has been set too high.
Answer: A

3. Which is a variable delay component in packet-voice networks?
A. Routing-queuing delay
B. Bit-serialization delay
C. End-point processing delay
D. Encoding and compression delay
Answer: A

4. What is the function of a gatekeeper in a converged network?
A. Provides network connectivity for legacy systems
B. Provides admission control and address translation between endpoints
C. Manages calls between three or more endpoints to facilitate multipoint conferencing
D. Performs call setup and address translation between packet-switched and circuit-switched networks
Answer: B

5. Which Quality of Service (QoS) technology is used by applications to signal QoS requirements to the network?
A. DSCP
B. RSVP
C. 802.1P
D. IP Precedence
Answer: B

6. Which International Telecommunication Union (ITU) G Series standard defines PCM voice coding at 64 Kbps?
A. G.711
B. G.726
C. G.728
D. G.729
Answer: A

7. Which of the following International Telecommunication Union (ITU) recommendations defines the standard for store-and-forward fax transmission over IP networks?
A. T.37
B. S.47
C. V.235
D. Q.931
Answer: A

8. Using a T1 circuit to connect a North American company to its European branch, a technician may choose an E1 carrier trunk. How many total and usable data and/or voice channels can be configured?
A. 23 channels
B. 24 channels
C. 30 channels
D. 32 channels
Answer: B

9. What is a function of a gateway in a converged network?
A. Provides Quality of Service (QoS) to converged networks
B. Provides admission translation and address control between IP endpoints
C. Manages calls between three or more endpoints to facilitate multipoint conferencing
D. Performs call setup and address translation between circuit-switched and packet-switched networks
Answer: D

10. Which media protocol is commonly used for Voice over IP (VoIP) solutions?
A. IMP
B. RTMP
C. MGCP
D. ICMP
Answer: C

11. What is the function of Quality of Service (QoS) in packet-voice networks?
A. Applies differential routing to voice packets
B. Improves encoding performance for voice packets
C. Reduces serialization and propagation delay to voice packets
D. Increases the amount of available bandwidth of voice packets
Answer: A

12. When a technician connects a North American T1 trunk to a European E1 trunk using a conversion device, which of the following will result?
A. No connection can be made between E1 and T1.
B. No more than 80 percent of the E1 trunk can be used.
C. The connection will be transparent to the technician.
D. No less than 80 percent of the T1 can be used or the connection will fail.
Answer: B