Deck 25: Internet Multimedia Support

Question 1

The RTP Timestamp is the absolute wall clock time when this report was sent.

Answer 1

False

Question 2

Soft-time applications have zero loss tolerance.

Answer 2

False

Question 3

VoIP is the transmission of speech across IP-based network.

Answer 3

True

Question 4

Hard real-time applications impose fewer requirements on the network,and it is therefore permissible to focus on maximizing network utilization.

Question 5

VoIP readily integrates with other services,such as combining Web access with telephone features through a single PC or terminal.

Question 6

With __________ ,the calling user supplies the phone number of a URI,which then triggers a set of protocol interactions resulting in the placement of the call.

A)VoIP
B)PBX
C)RTP
D)SIP

Question 7

Real-time applications are more concerned with timing issues.

Question 8

Proxies are not useful for enforcing policy.

Question 9

SIP is based on an HTTP-like request/response transaction model.

Question 10

The requirements of real-time traffic differ from those of high-speed but non-real-time traffic.

Question 11

________ is the determination of the willingness of the called party to engage in communications.

A)User location
B)User availability
C)User capabilities
D)Session management

Question 12

The Payload Type field identifies the media type of the payload and the format of the data,including the use of compression or encryption.

Question 13

An application-level firewall may prevent the forwarding of RTP packets.

Question 14

The _________ connects different physical networks in order to provide end-to-end connectivity.

A)softphone
B)IP PBX
C)media gateway
D)SIP

Question 15

A VoIP system is usually cheaper to operate than an equivalent telephone system with a PBX and conventional telephone network service.

Question 16

_________ is a desirable property for real-time communication.

A)Low overhead in header bits per packet
B)Modest buffer requirements within the network
C)Low jitter
D)All of the above

Question 17

A user agent server issues SIP requests.

Question 18

SIP can support any type of single media or multimedia session, including teleconferencing.

Question 19

The heart of the call placement process for VoIP is the __________ .

A)PBX
B)SIP
C)RTP
D)none of the above

Question 20

The jitter measure may provide a warning of increasing congestion before it leads to packet loss.

Question 21

The values in the __________ enable senders,receivers,and network managers to monitor conditions on the network as they relate to a particular session.

A)Sender Report
B)RTCP
C)Timestamp
D)Note

Question 22

RFC 3550 outlines ________ as a function performed by RTCP.

A)QoS and congestion control
B)identification
C)session control
D)all of the above

Question 23

In ________ real-time applications,a deterministic upper bound on jitter and high reliability takes precedence over network utilization considerations.

Question 24

_____ real-time applications can tolerate the loss of some portion of the communicated data.

Question 25

The _______ is designed to support digital and analog phones and connect to IP-based networks using VoIP,as well as provide if needed a connection to the public switched telephone network using traditional technology.

Question 26

The term _______ refers to software operating on a PC that implements VoIP.

Question 27

SIP supports five facets of establishing and terminating multimedia communications: user location,user availability,session setup,session management,and _________ .

Question 28

________ is the maximum variation in delay experienced by packets in a single session.

Question 29

_______ works by encoding voice information into a digital format,which can be carried across IP networks in discrete packets.

Question 30

SIP incorporates the use of a _________ ,which defines session content using a set of types similar to those used in MIME.

A)SDP
B)PBX
C)UAC
D)DNS

Question 31

The ________ is a simple device that produces one or more outgoing RTP packets for each incoming RTP packet.

A)register
B)translator
C)mixer
D)relay

Question 32

Whereas traditional telephone networks allocate dedicated circuits for voice communications using circuit switching,VoIP uses _______,allowing the sharing of transmission capacity.

Question 33

A _________ is an RTP relay that receives streams of RTPpackets from one or more sources,combines these streams,and forwards a new RTP packet stream to one or more destinations.

A)translator
B)mixer
C)location service
D)registrar

Question 34

_________ is the determination of the media and media parameters to be used.

A)Session setup
B)Session management
C)User capabilities
D)User availability

Question 35

The term ___________ refers to the use of multiple forms of information,including text,still images,audio,and video.

Question 36

The __________,defined in RFC 3261,is an application level control protocol for setting up,modifying,and terminating real-time sessions between participants over an IP data network.

Question 37

The _______ packet confirms to receivers that a prolonged silence is due to departure rather than network failure.

A)Note
B)RR
C)BYE
D)Timestamp

Question 38

An example of servers are _________ .

A)proxies
B)redirect servers
C)registrars
D)all of the above

Question 39

A resource within a SIP network is identified by a __________ .

A)UAS
B)URI
C)UAC
D)URL

Question 40

An intermediary entity that acts as both a server and a client for the purpose of making requests on behalf of other clients is the ____________ .

A)proxy server
B)registrar
C)redirect server
D)user agent

Question 41

RTCP receivers provide reception quality feedback using a Sender Report or a ________ Report.

Question 42

A ________ is a network element that receives requests in order to service them and sends back responses to those requests.

Question 43

The ___________ Protocol describes the content of sessions,including telephony,Internet radio,and multimedia applications.

Question 44

The __________ protocol is used only for the transmission of user data,typically in multicast fashion among all participants in a session.

Question 45

A _________ is any network element that sends SIP requests and receives SIP responses.