The following questions test your knowledge of topics explained in this chapter. You can find the answers to the questions in Appendix A, "Answers to Chapter Review Questions."
| 1. | Which two functions does a gateway provide? VLAN separation Translation between the VoIP and PSTN network Physical access for analog telephones and fax machines Power over Ethernet to the IP phone Database services
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| 2. | Which protocol provides out-of-band control information for RTP-based call flows? H.225 RAS RTP SNMP RTCP
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| 3. | A company has four sites and wants to implement VoIP at all of them. The requirements include implementing gateway devices with no call-processing intelligence at the remote sites, controlling all call traffic from the headquarters location, and having a single point of CAC. Which network architecture is appropriate to meet these requirements? Single-site architecture Distributed architecture Centralized architecture H.323 gateway architecture
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| 4. | In which of the following situations would a gateway be required? Cisco CallManager-to-IP network connection PBX-to-voice mail connection Key system-to-IP network connection PBX-to-PBX connection
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| 5. | Which function best describes a numbering plan? Determines routes between source and destination Defines a telephone number of a voice endpoint or application Performs digit manipulation when sending calls to the PSTN Performs least-cost routing for VoIP calls
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| 6. | Which worldwide prefix scheme was developed by the ITU to standardize numbering plans? G.114 E.164 G.164 E.114
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| 7. | Which three factors must be considered when calculating the total bandwidth of a VoIP call? CODEC size CRC usage Network-link overhead Sample size Capacity of network links
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| 8. | What is the overhead for Frame Relay? 3 bytes 5 bytes 6 bytes 18 bytes
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| 9. | What is the equivalent of one Erlang? 60 call seconds 36 centum call seconds 3600 centum call seconds 1 minute
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| 10. | Which feature provides transport security for a VoIP network? Encryption and data authentication Inspection of traffic at the firewall Proactive notification of an attempted attack Intrusion detection
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