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Chapter11

True/False
Indicate whether the statement is true or false.
 

 1. 

All VoIP calls are carried over the Internet.
 

 2. 

An off-the-shelf workstation can be programmed to act like an IP telephone.
 

 3. 

IP telephones are directly connected to the local loop.
 

 4. 

SIP and H.323 account for communication between media gateways.
 

 5. 

It is more difficult to transmit VoIP and video over IP signals over a packet-switched network than it is to transmit data signals.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 6. 

____ is the use of one network to simultaneously carry voice, video, and data communications.
a.
Multicasting
c.
Divergence
b.
Unicasting
d.
Convergence
 

 7. 

____ describes the use of any network to carry voice signals using the TCP/IP protocol.
a.
Telephony
c.
IP telephony
b.
Internet telephony
d.
Voice telephony
 

 8. 

When VoIP relies on the Internet, it is often called ____.
a.
telephony
c.
IP telephony
b.
Internet telephony
d.
voice telephony
 

 9. 

IPTV, videoconferencing, streaming video, and IP multicasting belong to the range of services known as ____.
a.
voice over IP
c.
video over IP
b.
data over IP
d.
Web over IP
 

 10. 

____ messaging is a service that makes several forms of communication available from a single user interface.
a.
Unified
c.
Diversified
b.
Instant
d.
Open
 

 11. 

Using VoIP over a WAN allows an organization to avoid paying long-distance telephone charges, a benefit known as ____.
a.
charge bypass
c.
toll bypass
b.
distance bypass
d.
easypass
 

 12. 

When using an analog telephone, a VoIP adapter that performs analog-to-digital conversion is known as a(n) ____.
a.
VTA (voice telephone adapter)
c.
DTA (digital telephone adapter)
b.
ATA (analog telephone adapter)
d.
DTA (data telephone adapter)
 

 13. 

In general, a(n) ____ is a private switch that accepts and interprets both analog and digital voice signals.
a.
IP-PBX
c.
Data PBX
b.
analog PBX
d.
IT-PBX
 

 14. 

When a caller uses an IP telephone, his or her voice is immediately digitized and issued from the telephone to the network in ____ form.
a.
segment
c.
circuit
b.
frame
d.
packet
 

 15. 

A computer programmed to act like an IP telephone is known as a(n) ____.
a.
video phone
c.
streaming server
b.
softphone
d.
compu-phone
 

 16. 

The popular Internet telephony software, Skype, is a type of ____.
a.
IP telephone
c.
teleapplication
b.
softphone
d.
compu-phone
 

 17. 

Among all video-over-IP applications, ____ is perhaps the simplest.
a.
VoIP
c.
IPTV
b.
videoconferencing
d.
streaming video
 

 18. 

One drawback to ____ video is that content may not be edited before it’s distributed.
a.
on demand
c.
streaming server
b.
live streaming
d.
VoIP
 

 19. 

Many streaming video services - and nearly all of those issued over a public network, such as the Internet - are examples of ____ transmissions.
a.
multicast
c.
unicast
b.
broadcast
d.
telecast
 

 20. 

When more than two people participate in a videoconference, for example, in a point-to-multipoint or multipoint-to-multipoint scenario, a video ____ is required.
a.
bridge
c.
gateway
b.
switch
d.
router
 

 21. 

____ signaling functions are more limited than those performed by the protocols in the H.323 group.
a.
RTCP
c.
MEGACO
b.
MGC
d.
SIP
 

 22. 

SIP and H.323 regulate ____ for VoIP or video-over-IP clients and servers.
a.
call signaling only
b.
control only
c.
call signaling and control
d.
communication between media gateways
 

 23. 

A(n) ____ is a computer that manages multiple media gateways.
a.
MPLS
c.
MEGACO
b.
MGCP
d.
MGC
 

 24. 

Many network engineers consider ____ to be superior to MGCP.
a.
SIP
c.
MEGACO
b.
RTCP
d.
MGC
 

 25. 

____ is preferred over TCP for real-time applications such as telephone conversations and videoconferencing.
a.
RTP
c.
RTCP
b.
UDP
d.
SIP
 

 26. 

____ is a measure of how well a network service matches its expected performance.
a.
QoS
c.
DiffServ
b.
RSVP
d.
MPLS
 



 
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