1.You are working with a potential customer that would like to integrate its existing PBX telephone
system into its IP network. The accompanying figure shows that the customer has two offices that
need to be connected to the IP network so that the customer can exchange telephone calls
without using the PSTN. Both PBXs are currently connected to T1 ISDN circuits. Which signaling
type will allow you to support your customer?
A.QSIG
B.CCS
C.CAS
D.TCCS
E.E&M
F.FXO
Correct:C
2.You are meeting with a customer that has deployed IP telephony at their headquarters location.
They would like to roll out IP telephony to their regional office as well. They are now using the
G.711 codec at headquarters. They want to be able to maximize the number of calls carried without
impacting voice quality or forcing a WAN upgrade. Which codec would be appropriate for their
WAN?
A.G.726
B.G.723.1
C.G.711
D.G.729B
Correct:D
3.Refer to the exhibit. Users are not able to complete a call from 6785551212
to 7705551111.
What is the correct diagnosis for the problem?
A.incorrect dialpeer
statement in Router 1
B.incorrect port statement in Router 1 pots dial peer
C.incorrect sessiontarget
statement in Router 2
D.incorrect destinationpattern
in Router 1
Correct:D
4.You have been forwarded some questions by a prospective VoIP customer who would like to
know the Cisco default sample size for the G.729 codec. What is it?
A.40 ms
B.30 ms
C.20 ms
D.10 ms
Correct:C
5.Examine the example output. hostname GW1 ! interface Ethernet 0/0 ip address 172.16.2.1
255.255.255.0 h323gateway
voip interface h323gateway
voip id GK1zone1.
abc.com abc.com
ipaddr 172.16.2.2 h323gateway
voip h323id
GW1 h323gateway
voip bind srcaddr 172.16.2.1 !
dialpeer
voice 1 voip destinationpattern
1212. sessiontarget
ras ! dialpeer
voice 2 pots
destinationpattern
2125551212 no register e164 ! end Choose the command that will restore
communication with gatekeeper functionality to this device.
A.h323gateway
voip h323id
GK1
B.gateway
C.h323gateway
voip bind srcaddr 172.16.2.2
D.h323gateway
voip GW1zone2.
abc.com abc.com ipaddr 172.16.2.1
Correct:B
6.Which preference key word assigns top precedence to a dial peer in a huntgroup?
A.0
B.priority
C.1
D.high
Correct:A
7.You are working with a potential customer that would like to integrate its existing PBX telephone
system into its IP network. The accompanying figure shows that the customer has two offices that
need to be connected to the IP network so that the customer can exchange telephone calls
without using the PSTN. Both PBXs use WinkStart
signaling. Which signaling type will allow you
to support the customer?
A.QSIG
B.CCS
C.CAS
D.TCCS
E.E&M
F.FXO
Correct:E
8.A 9 digit number must be dialed to reach numbers on the PSTN. What process makes sure that
the first digit 9 is not transmitted as part of the called number?
A.digit alternating
B.digit masking
C.digit manipulation
D.digit seizing
Correct:C
9.What is the E.164 numbering plan?
A.a proprietary PBX number plan
B.the IETF North American number plan
C.the European PBX standard telephony number plan
D.the ITU worldwide number plan
Correct:D
10.Refer to the exhibit. What is the minimum WAN bandwidth required to support three
simultaneous VoIP calls in this network?
A.19,200 bps
B.51,600 bps
C.79,200 bps
D.247,200 bps
Correct:B
11.In the connection between a Cisco router and an E&M port on a PBX, which side is generally
the Cisco side?
A.loop start
B.trunk circuit
C.switch port
D.signaling unit
Correct:D
12.Which dial plan characteristic shows the most obvious improvement by dropping a number
translation step?
A.availability
B.postdial
delay
C.scalability
D.hierarchical design
Correct:B
13.What are two basic parameters needed to setup a dial peer connected to the PSTN? (Choose
two.)
A.voice port
B.signaling type
C.interface bandwidth
D.destination pattern
Correct:A D
14.Which device is used to allow an H.323 stream to transit a firewall?
A.gatekeeper
B.gateway
C.proxy
D.MCU
Correct:C
15.You are working with your customer in their lab to test the effect of jitter on voice quality. You
have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the
impact on voice quality if after severe congestion the playout buffer empties and the source sends
packets to the buffer faster than they are leaving?
A.There will be no noticeable drop in quality.
B.The jitter buffer will adapt to the fasterarriving
packets by expanding the buffer size.
C.The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
D.After the jitter buffer fills up, subsequent packets are discarded.
Correct:D
16.Refer to the exhibit. Your customer wants to converge voice and data on the existing T1 Frame
Relay WAN link between New York and Atlanta. The customer has allocated 25 percent of the WAN
link for routing updates and other overhead. You are using 6 bytes of overhead for Frame Relay,
no cRTP, and the G.729 codec. How many calls could be placed on this link?
A.two
B.three
C.four
D.five
E.six
F.seven
Correct:C
17.In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is
generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if
cRTP is deployed without redundancy checks?
A.1 byte
B.2 bytes
C.3 bytes
D.4 bytes
E.20 bytes
F.40 bytes
Correct:B
18.You have a customer that is interested in determining the number of VoIP calls their Frame
Relay WAN links can support. Each of their Frame Relay WAN links has 84 kbps of bandwidth
available outside all other applications and overhead. How many G.729 calls using the 8 kbps
codec and 20 byte sample size can be supported?
A.1
B.2
C.3
D.4
Correct:C
19.You are working with a potential customer that would like to integrate its existing PBX
telephone system into its IP network. The accompanying figure shows that the customer has two
offices that need to be connected to the IP network so that the customer can exchange telephone
calls without using the PSTN. Both PBXs use an inband
signaling type. Which signaling type will
allow you to support your customer?
A.QSIG
B.CCS
C.CAS
D.TCCS
E.E&M
F.FXO
Correct:C
20.A network has the following characteristics: ?the use of the G.711 codec with a codec speed of
64 kbps ?a 160byte
sample size ?the use of Frame Relay without compressed RealTime
Transport Protocol (CRTP) ?FRF.12 with 6 bytes of overhead What minimum WAN bandwidth
would be required to support three simultaneous VoIP calls?
A.247200 bps
B.19200 bps
C.79200 bps
D.51600 bps
Correct:A
Link: http://www.killtest.co.kr/CCVP/642-432.asp