Deck 11: Voice and Video Over IP

Question 1

____ is the use of one network to simultaneously carry voice,video,and data communications.

A) Multicasting
B) Unicasting
C) Divergence
D) Convergence

Answer 1

D

Question 2

The popular Internet telephony software,Skype,is a type of ____.

A) IP telephone
B) softphone
C) teleapplication
D) compu-phone

Answer 2

B

Question 3

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

Answer 3

True

Question 4

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
B) switch
C) gateway
D) router

Question 5

All VoIP calls are carried over the Internet.

Question 6

Among all video-over-IP applications,____ is perhaps the simplest.

A) VoIP
B) videoconferencing
C) IPTV
D) streaming video

Question 7

IP telephones are directly connected to the local loop.

Question 8

IPTV,videoconferencing,streaming video,and IP multicasting belong to the range of services known as ____.

A) voice over IP
B) data over IP
C) video over IP
D) Web over IP

Question 9

____ messaging is a service that makes several forms of communication available from a single user interface.

A) Unified
B) Instant
C) Diversified
D) Open

Question 10

Using VoIP over a WAN allows an organization to avoid paying long-distance telephone charges,a benefit known as ____.

A) charge bypass
B) distance bypass
C) toll bypass
D) easypass

Question 11

In general,a(n)____ is a private switch that accepts and interprets both analog and digital voice signals.

A) IP-PBX
B) analog PBX
C) Data PBX
D) IT-PBX

Question 12

Many streaming video services - and nearly all of those issued over a public network,such as the Internet - are examples of ____ transmissions.

A) multicast
B) broadcast
C) unicast
D) telecast

Question 13

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

Question 14

When using an analog telephone,a VoIP adapter that performs analog-to-digital conversion is known as a(n)____.

A) VTA (voice telephone adapter)
B) ATA (analog telephone adapter)
C) DTA (digital telephone adapter)
D) DTA (data telephone adapter)

Question 15

When VoIP relies on the Internet,it is often called ____.

A) telephony
B) Internet telephony
C) IP telephony
D) voice telephony

Question 16

____ describes the use of any network to carry voice signals using the TCP/IP protocol.

A) Telephony
B) Internet telephony
C) IP telephony
D) Voice telephony

Question 17

One drawback to ____ video is that content may not be edited before it's distributed.

A) on demand
B) live streaming
C) streaming server
D) VoIP

Question 18

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
B) frame
C) circuit
D) packet

Question 19

A computer programmed to act like an IP telephone is known as a(n)____.

A) video phone
B) softphone
C) streaming server
D) compu-phone

Question 20

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

Question 21

Many network engineers consider ____ to be superior to MGCP.

A) SIP
B) RTCP
C) MEGACO
D) MGC

Question 22

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
The nerve center for networks that adhere to H.323.

Question 23

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
A device providing translation between network devices running H.323 signaling protocols and devices running other types of signaling protocols.

Question 24

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
Attempts to reserve a specific amount of network resources for a transmission before the transmission occurs.

Question 25

A(n)____ is a computer that manages multiple media gateways.

A) MPLS
B) MGCP
C) MEGACO
D) MGC

Question 26

______________________________ is a simple technique that addresses QoS issues by prioritizing traffic.

Question 27

____ is preferred over TCP for real-time applications such as telephone conversations and videoconferencing.

A) RTP
B) UDP
C) RTCP
D) SIP

Question 28

______________________________ is a QoS technique that replaces the IP datagram header with a label at the first router a data stream encounters.

Question 29

____ is a measure of how well a network service matches its expected performance.

A) QoS
B) RSVP
C) DiffServ
D) MPLS

Question 30

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
The H.323 protocol that handles call or videoconference signaling.

Question 31

When streaming videos are supplied via the Web,they are often called ____________________.

Question 32

Many VoIP vendors prefer ____________________ over H.323.

Question 33

____________________ performs the same functions as MGCP,but using different commands and processes.

Question 34

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
Helps voice and video networks overcome UDP's shortcomings.

Question 35

____ signaling functions are more limited than those performed by the protocols in the H.323 group.

A) RTCP
B) MGC
C) MEGACO
D) SIP

Question 36

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
Ensures that the type of information issued to an H.323 terminal is formatted in a way that the H.323 terminal can interpret.

Question 37

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
Any node that provides audio,visual,or data information to another node.

Question 38

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
A collection of H.323 terminals,gateways,and MCUs that are managed by a single H.323 gatekeeper.

Question 39

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

Question 40

MATCHING
Match each item with a statement below:
a.H.323 terminal
f.H.225
b.H.323 gateway
g.H.245
c.H.323 gatekeeper
h.RTP
d.MCU (multipoint control unit)
i.RSVP
e.H.323 zone
A computer that provides support for multiple H.323 terminals and manages communication between them.

Question 41

Explain why MGCs are especially advantageous on large VoIP networks.

Question 42

Explain the issue regarding the need for electric current that IP telephones face.

Question 43

Explain how gateways on a converged network exchange and translate signaling and control information with each other so that voice and video packets are properly routed through the network.

Question 44

Describe the RTCP (Real-time Transport Control Protocol),defined in RFC 3550 by the IETF.

Question 45

Describe five capabilities to which SIP is limited.

Question 46

Describe five features unique to IP telephones.

Question 47

Describe six functions performed by signaling protocols.

Question 48

Explain why UDP is preferred over TCP for real-time applications such as telephone conversations and videoconferences.

Question 49

How does implementing VoIP assist in centralizing voice and data network management?

Question 50

Besides being extremely mobile,describe another advantage to softphones.