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1. (TCO 1) ITU recommendation
G. 711 is also referred to as _____ (Points : 5)
2. (TCO 1) What’s a typical amount
of downtime associated with PSTN business services? (Points : 5)
3. (TCO 2) Which circuit-switched Private Branch
Exchange (PBX) hardware allows internal phones and extensions to be connected
to the PBX? (Points : 5)
4. (TCO 2) An end user of a(n) _____ uses line keys on
the phone panel to select and access telephone company lines. (Points : 5)
5. (TCO 5) Which transport layer protocol is not used by
voice packets in VoIP? (Points : 5)
6. (TCO 5) In the RTP header, _____ is used by the
receiver to detect lost packets and to ensure that received packets are played
back in proper order? (Points : 5)
7. (TCO 4) Which of the following audio codecs, in its
original form, requires 64 Kbps of bandwidth? (Points : 5)
8. (TCO 4) Which of the following audio codecs, in its
original form, requires the least amount of bandwidth? (Points : 5)
9. (TCO 5) Which of the following techniques help
reduce VoIP bandwidth consumption? (Points : 5)
10. (TCO 3) Which of the following VoIP equipment is
typically seen in a residential environment? (Points : 5)
11. (TCO 6) Which SIP method/response is typically
generated to signal the end of a call session or dialog? (Points : 5)
12. (TCO 6) Which SIP method/request or response is
shown below?
13. (TCO 6) In H.323 call signaling, _____ is used for
terminals to exchange capabilities and preferences such as audio and video
codecs during a call setup. (Points : 5)
14. (TCO 6) Which of the following is not a typical
function of VoIP gateways? (Points : 5)
15. (TCO 7) Which of the following facts about Local
Number Portability (LNP) is not correct? (Points : 5)
16. (TCO 7) Which of the following is a telephony
feature that was made possible by VoIP? (Points : 5)
17. (TCO 8) What’s the name of the gateway
interface/port that connects an analog phone? (Points : 5)
18. (TCO 8) Which of the following is typically
required to connect SIP trunks to legacy PBXs and analog phones? (Points : 5)
19. (TCO 9) 200 seconds of total holding time during
the Busy Hour generates a traffic load of _____ (Points : 5)
20. (TCO 9) Given that the targeted call blocking
probability remains the same, which of the following PBX systems will support
the least amount of traffic during the Busy Hour? (Points : 5)
21. (TCO 12) Sending an INVITE message to every phone
number on a network in search of vulnerable devices based on received responses
is referred to as _____ (Points : 5)
22. (TCO 12) Even if the voice traffic is encrypted,
an intruder may capture and interpret _____ to discover who calls whom, when
calls involve specific phones, and other information.(Points : 5)
23. (TCO 11) Network connectivity is a(n) _____ a good
user experience on VoIP services. (Points : 5)
24. (TCO 11) Which of the following is not correct
about echo in a voice call? (Points : 5)
25. (TCO 10) IEEE 802.1p defines eight priority
classes for _____ prioritization. (Points : 5)
26. (TCO 13) Which of the following could be an
indicator of high-end desktop IP phones? (Points : 5)
27. (TCO 13) Having a third-party assume all PBX
management responsibilities is referred to as a(n) _____ solution. (Points : 5)
28. (TCO 13) What does this formula calculate?
(the expected returns from a project – the cost of
implementing a project) / the amount of time required to complete the project.
(Points : 5)
1. (TCO 5) ABC Inc. replaced its
legacy circuit-switched PBX with an SIP-based VoIP system on its Ethernet LAN.
When capturing and observing voice packets using Wireshark, which header
contains the sequence number and time stamp information needed for playing back
the audio at the receiving end? Describe, in one
2. (TCO 5) The IT department of ABC Inc. decides to
use the G. 711 codec on its local VoIP telephony network. What’s the payload
bit rate of G. 711? What does the payload bit rate mean? Explain, in one
paragraph, how increasing and reducing the payload size of voice packets
affects the required bandwidth per VoIP conversation, respectively. (Points :
10)
3. (TCO 6) Explain, in a couple of paragraphs, the
origin and history of the SIP protocol and the H.323 protocol suite. What are
the most noticeable characteristics of each? What are some of their cons?
(Points : 10)
4. (TCO 10) Explain, in one paragraph, layer 2
prioritization and its priority classes. Explain, in one paragraph, layer 3
prioritization and its precedence levels. If a company plans to switch to VoIP,
what should the IT department look for in the switches and routers on its
network? (Points : 10)
5. (TCO 9) Use the Erlangs and VoIP Bandwidth
Calculator at http://www.erlang.com/calculator/eipb/ to complete the following
question.
ABC Inc. is planning to lease a 512 Kbps frame relay
connection between two PBXs from two branch locations. The audio codec used on
the trunk is G.729A with a 20-millisecond packet duration. Assume the targeted
call blocking probability for ABC Inc. is 1% (i.e., 0.01). How much traffic
volume/load (in Erlangs) can this trunk support?
120 call attempts, with an average call duration of 10 minutes during the Busy Hour have been observed on the connection. What’s the current traffic volume/load (in Erlangs) on this trunk connection? Compare the current traffic volume/load to the supported traffic volume/load calculated above. Does the frame relay trunk have enough capacity to support the current traffic volume/load? (Points : 10)
120 call attempts, with an average call duration of 10 minutes during the Busy Hour have been observed on the connection. What’s the current traffic volume/load (in Erlangs) on this trunk connection? Compare the current traffic volume/load to the supported traffic volume/load calculated above. Does the frame relay trunk have enough capacity to support the current traffic volume/load? (Points : 10)
6. (TCO 11) ABC Inc. is re-evaluating
the end-to-end delay budget of its cross-country VoIP services. In one
paragraph, name at least two components (i.e., devices or processes) that
contribute to the end-to-end latency budget
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