Deck 12: Voice and Video Over IP

Question 1

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

Answer 1

True

Question 2

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

Answer 2

B

Question 3

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

Answer 3

False

Question 4

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 5

All VoIP calls are carried over the Internet.

Question 6

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 7

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 8

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 9

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

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

Question 10

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 11

____ 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 12

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

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

Question 13

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 14

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 15

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

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

Question 16

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

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

Question 17

____ 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 18

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 19

IP telephones are directly connected to the local loop.

Question 20

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

Question 21

Explain why MGCs are especially advantageous on large VoIP networks.

Question 22

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

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

Question 23

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

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

Question 24

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

Question 25

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

Question 26

Some VoIP vendors prefer ____________________ over H.323.

Question 27

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

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

Aside from extreme mobility, describe another advantage to softphones.

Question 30

Describe IP telephones and how they are connected to a network.

Question 31

____ 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 32

Describe five capabilities to which SIP is limited.

Question 33

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 34

Describe six functions performed by signaling protocols.

Question 35

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 36

Many network engineers consider ____ to be superior to MGCP.

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

Question 37

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

Question 38

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

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

Question 39

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

Question 40

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

Question 41

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