Deck 10: Integrating Voice, Video, and Data

Question 1

Efficiency is the amount of traffic passing through a given point on a network at a given time.

Answer 1

False

Question 2

Synchronization is most reliable when there is enough throughput for an application so that bits or frames are not lost or delayed too long by network congestion.

Answer 2

False

Question 3

Gigabit Ethernet cannot be trunked.

Answer 3

False

Question 4

On a computer monitor or digital TV screen, interlaced means that up to 60 frames are sent per second.

Question 5

For many LANs that deploy multimedia applications, one of the most cost-effective design methods and reliable topologies is to combine Fast Ethernet and Gigabit Ethernet .

Question 6

For some applications that require high bandwidth, network performance is improved by designing the applications to use multicasts.

Question 7

On a legacy LAN, a significant amount of bandwidth can be gained by replacing old thinnet coax and repeater runs with Category 5 twisted-pair cable and 100BaseTX switches.

Question 8

Many audio and video technologies use sampling techniques when a signal is converted from analog to digital.

Question 9

AVI is the technology used with digital television.

Question 10

Unicast multimedia applications are difficult to scale up for increased numbers of users, and if there are many users, there is high traffic volume and a need for high bandwidth.

Question 11

NTSC standards are followed worldwide.

Question 12

A multimedia application may be only one of the following types: unicast, broadcast, or multicast; it cannot be a combination of these types.

Question 13

Microsoft's IP/TV enables interactive conferencing for people at remote locations.

Question 14

The higher the bandwidth, the higher the throughput.

Question 15

The NTSC standard for color TV transmissions is a transmission rate of ____ frames per second.

A)60
B)20
C)40
D)30

Question 16

A television ____ is one full picture in a series of pictures used to simulate action.

A)cell
B)frame
C)scan line
D)sub-file

Question 17

Multicasting on networks that use switches and no routers is entirely dependent on IGMP .

Question 18

Audio file technologies are far more varied than video technologies.

Question 19

Digital television can be sent over longer distances than analog while producing a sharper picture.

Question 20

H.225, H.245, and H.450 are examples of codecs defined with the ITU H.323 standard.

Question 21

In the US, the main line power operates at a frequency of ____ Hz.

A)60
B)50
C)75
D)90

Question 22

In VoIP, the IP addresses are converted to telephone numbers, and vice versa, using the ____ standard.

A)ITU E.164
B)ITU H.323
C)SIP
D)G.711

Question 23

MPEG-2 has ____ levels of resolution.

A)3
B)4
C)4
D)6

Question 24

Which is not a MPEG level that has been ratified or that is in development?

A)MPEG-4
B)MPEG-7
C)MPEG-10
D)MPEG-21

Question 25

____ is a television transmission standard that is used in Africa, Europe, the Middle East, and South America.

A)NTSC
B)PAL
C)SECAM
D)ERC

Question 26

____ is a video compression technique that finds duplicated patterns in frames, even when the patterns are a different orientation or size.

A)Bidirectional interpolation
B)Lossy compression
C)Fractional image compression
D)Predicted encoding

Question 27

The M in PCM stands for ____.

A)multicast
B)modulation
C)media
D)moving

Question 28

Which is not true about SIP?

A)It uses commands that are modeled after those used by HTTP.
B)Addressing is accomplished by using URLs.
C)It can be used over the Internet or on an IP LAN, MAN, or WAN.
D)None of the above.

Question 29

The ____ standard outlines several types of devices for voice communications.

A)ITU E.164
B)ITU H.323
C)SIP
D)MGCP

Question 30

The figure above illustrates ____.

A)bidirectional interpolation
B)lossy compression
C)fractional image compression
D)predicted encoding

Question 31

Which is not true about VoIP?

A)It is used as an alternative to PBXs, PAXs, and PABXs.
B)When a VoIP telephony system needs to be connected to the outside world, a specialized gateway is used to convert the IP packetized voice data into a signal that can be transmitted over a public switched telephone network for regional, long distance, or both voice communications.
C)VoIP implementations can be expensive, because organizations have to install special networks.
D)None of the above.

Question 32

____ includes the ability to search for content descriptions so that you can play a particular audio portion.

A)MPEG-4
B)MPEG-1
C)MPEG-7
D)MPEG-2

Question 33

The figure above illustrates ____.

A)bidirectional interpolation
B)lossy compression
C)fractional image compression
D)predicted encoding

Question 34

G.711, G.729a, and G.726 are associated with the ____ standard.

A)ITU E.164
B)ITU H.323
C)SIP
D)MGCP

Question 35

Which involves a user agent client, one or more proxy servers that determine which VoIP services are available from other servers or network devices, and one or more redirect servers that enable the user agent, which initiates a call, to determine the IP address of the destination user agent?

A)ITU E.164
B)ITU H.323
C)SIP
D)MGCP

Question 36

____ is an audio and video file format that was developed for use with Microsoft Windows 3.1 and higher.

A)MPEG
B)Fractional image compression
C)AVI
D)MPEG-2

Question 37

Which is not true about AVI?

A)It has limitations in terms of the quality of reproduction and transport over a network.
B)File sizes are relatively small.
C)It is a subset of the Resource Interchange File Format (RIFF).
D)None of the above.

Question 38

Which is not an audio standard derived through the ISO or ITU-T?

A)MPEG-2
B)PCM
C)ODA ACA
D)MIDI

Question 39

When using VoIP, the call processor does not ____.

A)setup and terminate calls
B)convert voice sounds into binary and then into IP packets
C)route calls
D)translate telephone numbers of IDs into IP addresses

Question 40

In the future, look for ____ to replace many other formats as the most-used sound-encoding techniques.

A)MPEG-7
B)MPEG-21
C)VoIP
D)Both A and B.

Question 41

____ incorporates QoS, which means it allocates bandwidth specifically for different application needs, such as for multimedia.

A)ATM
B)SONET
C)B-ISDN
D)DSL

Question 42

____ is the time it takes for a bridge, switch, or router to compare a frame or packet contents with its table information, change the frame or packet header, and provide any special services.

A)Transmission delay
B)Propagation delay
C)Processing delay
D)Store-and-forward delay

Question 43

____ is the time it takes for a packet to travel a segment or network, end to end. It is usually associated with fiber-optic media and the speed of light through the media.

A)Transmission delay
B)Propagation delay
C)Processing delay
D)Store-and-forward delay

Question 44

Video technologies have roots in analog TV.

Question 45

When integrated voice, video, and data files are sent across the network, they may need to be ____ by software at the client receiver, to make sure all of the constituent pieces are assembled and played in the right order.

A)decoded
B)unstreamed
C)synchronized
D)reassembled

Question 46

By combining MAC and IP addressing, multicasting sends one packet that is directed to one or more groups.

Question 47

____ is the time in which a packet travels across a network medium.

A)Transmission delay
B)Propagation delay
C)Processing delay
D)Store-and-forward delay

Question 48

For a network, a scan line is a performance assessment of that network under varying loads or circumstances.

Question 49

In ____ transmissions, one copy of each frame or packet is sent to each destination point that is requesting use of the multimedia application.

A)unicast
B)multicast
C)broadcast
D)Both A and B.

Question 50

Which is not true about MGCP?

A)It is compatible with networks that use SIP.
B)It can be used with H.323 systems.
C)It has relatively low overhead because it uses USP for audio communications over an IP network.
D)None of the above.

Question 51

JPEG compression is intended for still pictures.

Question 52

The Host Membership Report is associated with the ____ protocol.

A)IGMP
B)RIP
C)DVMRP
D)MOSPF

Question 53

The higher the sampling rate, the lower the quality of the resulting audio reproduction or digital image.

Question 54

____ is defined through RFC 2705.

A)ITU E.164
B)ITU H.323
C)SIP
D)MGCP

Question 55

____ is not an addition to MGCP.

A)MEGACO
B)H.248
C)H.323
D)None of the above.

Question 56

Transmitted audio files are always very large.

Question 57

A(n)____ transmission is an example of multipoint traffic.

A)unicast
B)multicast
C)broadcast
D)Both B and C.

Question 58

____ is the time used by a bridge, switch, or router to examine, process, and retransmit a frame or packet.

A)Transmission delay
B)Propagation delay
C)Processing delay
D)Store-and-forward delay

Question 59

____ has been developed to enable network administrators and developers to use techniques to compensate when network problems interfere with the quality of real-time multimedia applications.

A)RTCP
B)RSVP
C)RTP
D)MOSPF

Question 60

It is most difficult to develop applications to use ____.

A)unicasting
B)multicasting
C)broadcasting
D)None of the above.

Question 61

IPX/SPX spoofing is a feature of a WAN router that enables the router to send a response to the server to maintain the connection, thus reducing traffic from all connected clients.

Question 62

List three popular uses of audio and video technologies. How is the growth in voice and video affecting computer systems and networks?

Question 63

The V in DVMRP stands for ____________________.

Question 64

What are three things you should do when you select a WAN service from a provider?

Question 65

When selecting LAN switches for a network, choose switches that have ____________________ or multicast packets can flood a network in the same way as broadcast packets.

Question 66

ODA, or ____________________, is an ISO standard for specially formatted documents containing a combination of text graphics, sound, and other presentation modes.

Question 67

What is jitter? How is it measured? How can it be reduced?

Question 68

What is VoIP?

Question 69

What is RSVP, and what is it used for?

Question 70

____________________ are the number of lines, top to bottom, that are used to construct one image, or frame, on a TV monitor.

Question 71

What is lossy compression? Where is it used? What is the problem with this type of compression?

Question 72

The time it takes to send information from the transmitting device to the receiving device is called ____________________.

Question 73

On a computer monitor or digital TV screen, a(n)____________________ is a small dot of light.

Question 74

One way to improve WAN performance is to use bandwidth on demand, which is a feature of a WAN router that enables the router to send a response to the server to maintain the connection, thus reducing traffic from all connected clients.

Question 75

RSVP uses multicast packets to help establish QoS for RTP transmission sessions.

Question 76

____________________ is the transmission capacity of a communications medium.

Question 77

As we look to the future, virtually; anyone who wants to view a movie at home will do so through ____________________ using cable networks or the Internet.

Question 78

What is a codec, and what is it used for? Give an example of a codec.

Question 79

What is streaming? When might it be used? What are its disadvantages?

Question 80

____________________ is a process that is used to reduce the size of a normal file, such as by using techniques to remove redundant information or blank areas in the file's structure.