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Teaching Since: May 2017
Last Sign in: 189 Weeks Ago
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  • MCS,MBA(IT), Pursuing PHD
    Devry University
    Sep-2004 - Aug-2010

Experience

  • Assistant Financial Analyst
    NatSteel Holdings Pte Ltd
    Aug-2007 - Jul-2017

Category > Information Systems Posted 26 Dec 2017 My Price 10.00

ideal for real-time voice services?

Question 1.1. (TCO 1) Which of the following makes the PSTN, as compared to IP networks, ideal for real-time voice services? (Points : 5)

       High availability (i.e., uptime)
       Low latency
       Low call setup delay
       All of the above

Question 2.2. (TCO 1) The lack of network resources in the circuit-switched PSTN is communicated to users by using the _____ signal. (Points : 5)
       side-tone
       ring-back
       dial-tone
       fast-busy or reorder

 

Question 3.3. (TCO 1) Which of the following characteristics of an IP network doesn’t favor transmission of voice? (Points : 5)
       IP is a connectionless protocol. It provides no guarantees of delivery.
       Compared to a TDM channel/circuit, the bandwidth requirement for a call is higher if voice is packetized with header overhead.
       An IP network accepts packets at any time without any call admission control.
       All of the above

 

Question 4.4. (TCO 2) How many digital voice channels/circuits does a full T-1 voice trunk carry? (Points : 5)
       1
       42
       24
       40

 

Question 5.5. (TCO 2) Which of the following characteristics of a circuit-switched Private Branch Exchange (PBX) could be beneficial to the call quality? (Points : 5)
       Once in session, calls are not affected by each other.
       Hardware running dedicated cables is separated from that of data network.
       Switching and transmission resources are dedicated to each call for its full duration.
       All of the above

 

Question 6.6. (TCO 5) Which of the following is not true about VoIP? (Points : 5)
       The sending device saves up the constant rate bit stream for a short interval, and then places those bits as the data payload in a packet.
       The transport of digital information is in packet form, not over a dedicated channel.
       The receiver extracts packet payloads and stitches them together, recreating the bit stream and turning it into sound.
       None of the above

 

Question 7.7. (TCO 5) The RTCP protocol _____ (Points : 5)
       syncs various clock and time stamps of media streams.
       reports octets sent or received, as well as counts of lost packets.
       monitors and calculates the quality of an RTP connection.
       All of the above

 

Question 8.8. (TCO 4) Which of the following audio codecs, in its original form, has the lowest Mean Opinion Score (MOS)? (Points : 5)
       G.711
       G.728
       G.726
       G.729A

 

Question 9.9. (TCO 3) Which of the following devices can be seen in a VoIP system? (Points : 5)
       IP phones
       SIP servers
       Soft phones
       All of the above

 

Question 10.10. (TCO 4) Which of the following is a fact about Pulse Code Modulation (PCM)? (Points : 5)
       It’s also known as the ITU G.711 standard.
       It produces a payload bit rate of 64 Kbps.
       It samples an analog audio signal 8,000 times per second.
       All of the above

 

Question 11.11. (TCO 6) Which of the following is a VoIP signaling protocol? (Points : 5)
       SIP
       H.323
       MEGACO
       All of the above

 

Question 12.12. (TCO 6) Internal to a physical gateway device, Media Gateways (MGWs) register with a Media Gateway Controller (MGC) using the _____ protocol. (Points : 5)
       MEGACO
       H.323
       SIP
       RTCP

 

Question 13.13. (TCO 6) In an H.323-based VoIP system, what protocols could be used by a gatekeeper during a call setup? (Points : 5)
       H.225
       H.245
       H.248
       All of the above

 

Question 14.14. (TCO 7) A 911 call is directly sent to _____ (Points : 5)
       the local police department.
       a local Public Service Answering Point (PSAP).
       the local fire department.
       the local hospital.

 

Question 15.15. (TCO 7) ITU Recommendation T.38 describes real-time faxing over a (the) _____ by defining gateways and a protocol between them. (Points : 5)
       PSTN
       packet network
       modem
       None of the above

 

Question 16.16. (TCO 8) _____ allows calls between VoIP customer locations to be terminated without incurring per-minute U.S. usage charges. (Points : 5)
       Voice IP Enterprise Routing (VIPER)
       Service Level Agreement (SLA)
       Interexchange Carrier (IXC)
       Local Exchange Carrier (LEC)

 

Question 17.17. (TCO 8) The _____ information of a phone is sent into the trunk when placing an E911 call.(Points : 5)
       Calling Line ID (CLID)
       IP address
       Dual-tone Multi-frequency (DTMF)
       Network Address Translation (NAT)

 

Question 18.18. (TCO 9) Calculate the number of Erlangs that is equivalent to 10 CCS. (Points : 5)
       10
       0.1
       3.6
       0.28

 

Question 19.19. (TCO 9) Assume that each SIP trunk can carry 1 Erlang of traffic. Calculate the utilization of two SIP trunks that carry 1.6 Erlangs of traffic. (Points : 5)
       1.6.
       0.625
       1.25
       0.8

 

Question 20.20. (TCO 10) Carriers offer IP transport services designed to minimize _____ by routing via the shortest or most direct physical path over a packet WAN. (Points : 5)
       delay jitter
       packet loss
       queuing delay
       propagation delay

 

Question 21.21. (TCO 10) Granting real-time voice traffic a higher priority may not make any difference on its QoS guarantee when _____ (Points : 5)
       a network is very lightly loaded.
       fast links are adopted on a network.
       only voice packets (i.e., no data packets) are carried on a network.
       All of the above

 

Question 22.22. (TCO 12) As a security measure, an IP phone may require _____ from a proxy server or a registrar server before it can send packets to anywhere other than the server. (Points : 5)
       authorization
       encryption
       authentication
       password

 

Question 23.23. (TCO 12) A firewall should open _____ to allow different VoIP control signaling and active call connections to pass through. (Points : 5)
       the full range of TCP ports
       the full range of UDP ports
       single-port “pinholes”
       all ports

 

Question 24.24. (TCO 11) The Request for Proposal (RFP) is also called _____ (Points : 5)
       Request for Information (RFI).
       acceptance test plan.
       Service Level Agreement (SLA).
       Statement of Work.

 

Question 25.25. (TCO 11) Which of the following is not correct about troubleshooting echo? (Points : 5)
       The built-in echo canceling of speaker phones and those designed for audio conferencing could fail.
       The echo canceler feature of a gateway between VoIP and analog lines could be turned off.
       Echo is not “visible” in packets, nor can it be heard when playing back audio streams.
       Echo could be caused by acoustic feedback from a phone or headset.

 

Question 26.26. (TCO 13) License terms and costs may depend on _____ (Points : 5)
       the number of servers.
       the number of sites.
       the number of end points (e.g., softphones).
       All of the above

 

Question 27.27. (TCO 13) Which of the following is part of a recurring cost of owning a VoIP systems? (Points : 5)
       VoIP hardware leases.
       Backup POTS lines.
       IP network access links.
       All of the above

 

Question 28.28. (TCO 13) _____ is a financial estimate that helps consumers and enterprises determine the direct and indirect costs of a product or system. (Points : 5)
       Call for proposal (CFP)
       Return on investment (ROI)
       Total cost of ownership (TCO)
       Payback time period

Answers

CourseLover
(12)
Status NEW Posted 26 Dec 2017 04:12 PM My Price 10.00

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