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Test your basic knowledge |
Voip Technology
Start Test
Study First
Subject
:
it-skills
Instructions:
Answer 49 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A technique for ensuring QoS by prioritizing traffic. DiffServ places information in the DiffServ field in an IPv4 datagram. In IPv6 datagrams - DiffServ uses a similar field known as the Traffic Class field. The information indicates to the network
RTCP (Real-time Transport Control Protocol)
DiffServ (Differentiated Service)
H.245
VoATM (voice over ATM)
2. A telephone switch used to connect calls within a provate organization.
PBX (private branch exchange)
fax gateway
IP telephone
signaling
3. A streaming video - either on demand or live - that is delivered via the Web.
H.323 gateway
video over IP
Webcast
unified messaging
4. A telephone used for VoIP on a TCP/IP-based network. IP telephones are designed to transmit and receive only digital signals.
IP telephone
H.245
video-on-demand
fax gateway
5. The provision of telephone service over a packet-switched network running the TCP/IP protocol suite.
VoIP (voice over IP)
video over IP
MCU (multipoint control unit)
H.323 gatekeeper
6. As specified in RFC 2205 - a QoS technique that attempts to reserve a specific amount of network resources for a transmission before the transmission occurs.
DiffServ (Differentiated Service)
RSVP (Resource Reservation Protocol)
user agent
IP telephone
7. Any type of video service - including IPTV - videoconferencing - and streaming video - that delivers video signals over packet-switched networks using the TCP/IP protocol suite.
video over IP
VoIP (voice over IP)
user agent server
VoATM (voice over ATM)
8. A protocol suite codified by the IETF (in RFC 2543) as a set of Session layer signaling and control protocols for multiservice - packet-based networks. With few exceptions - SIP performs much the same functions as the H.323 signaling protocols perfor
H.225
SIP (Session Initiation Protocol)
RSVP (Resource Reservation Protocol)
DiffServ (Differentiated Service)
9. A service in which a video is stored as an encoded file is delivered to a viewer upon his request.
video-on-demand
Internet telephony
fax gateway
Webcast
10. A protocol used between media gateway controllers and media gateways. MEGACO is poised to replace MGCP on modern converged networks - as it supports a broader range of network technologies - including ATM. Also known as H.248.
set top box
MEGACO
VoDSL (voice over DSL)
H.323 zone
11. On a SIP network - a server that maintains a database containing information about the locations (network addresses) of each user agent in its domain. When the user agent joins a SIP network - it transmits its location information to the SIP registra
MCU (multipoint control unit)
H.225
registrar server
user agent
12. A service that transmits faxes over TCP/IP network.
H.225
endpoint
EF (Expedited Forwarding)
FoIP (fax over IP)
13. A session layer call signaling protocol defined as part of ITU's H.323 multiservice network architecture. H.225 is responsible for call or videoconference setup between nodes on a VoIP or video-over-IP network - indicating node status - requesting ad
user agent
H.323 gateway
VoIP (voice over IP)
H.225
14. A private switch that accepts and interprets both analog and digital voice signals (although some IP-PBXs do not accept analog lines). It can connect with both traditional PSTN lines and data networks. An IP-PBX transmits and receives IP-based voice
EF (Expedited Forwarding)
IP-PBX
H.245
unified messaging
15. In the DiffServ QoS technique - a forwarding specification that assigns each data stream a minimum departure rate from a given node. This technique circimvents delays that slow normal data from reaching its destination on time and in sequence. EF inf
videoconferencing
EF (Expedited Forwarding)
H.323 zone
proxy server
16. A gateway that can translate IP fax data into analog fax data and vice versa. A fax gateway can also emulate and interpret conventional fax signaling protocols when communicating with a conventional fax machine.
MEGACO
fax gateway
IP telephone
redirect server
17. On a SIP network - a server that accepts and responds to requests from user agents and SIP proxy servers for location information on recipients that belong to external domains.
redirect server
DiffServ (Differentiated Service)
H.323 terminal
unified messaging
18. The nerve center for networks that adhere to H.323. Gatekeepers authorize and authenticate terminals and gateways - manage bandwidth - and oversee call routing - accounting - and billing. Gatekeepers are optional on H.323 networks.
RSVP (Resource Reservation Protocol)
H.323 terminal
H.323 gatekeeper
FoIP (fax over IP)
19. An interal or externally attached adapter that converts analog telephone signals into packet-switched voice signals and vice-versa.
unified messaging
ATA (analog telephone adapter)
set top box
softphone
20. In SIP terminology - a user agent client or user agent server.
Webcast
user agent
H.323 terminal
VoATM (voice over ATM)
21. In SIP terminology - end-user devices such as workstations - PDAs - cell phones - or IP telephones. A user agent client initiates a SIP connection.
RTP (Real-time Transport Protocol)
user agent client
proxy server
IP telephone
22. A session layer control protocol defined as part of ITU's H.323 multiservice network architecture. H.245 is responsible for controlling a session betwenn two nodes. For example - it ensures that the two nodes are communicating in the same format.
softphone
H.245
IPTV (IP television)
MCU (multipoint control unit)
23. The centralized management of multiple types of network-based communications - such as voice - video - fax - and messaging services.
VoDSL (voice over DSL)
user agent server
unified messaging
SS7 (Signaling System 7)
24. In the DiffServ QoS technique - a forwarding specification that allows routers to assign data streams one of several prioritization levels. AF is specified in the DiffServ field in an IPv4 datagram.
MEGACO
user agent
AF (Assured Forwarding)
FoIP (fax over IP)
25. On a network following the H.323 standard - any node that provides audio - visual - or data information to another node.
user agent
H.323 terminal
IPTV (IP television)
VoDSL (voice over DSL)
26. An ITU standard that describes an architecture and a suite of protocols for establishing and managing multimedia services sessions on a packet-switched network.
IPTV (IP television)
endpoint
H.323
H.323 terminal
27. In the context of IPTV - a device that decodes digital video signals and issues them to the television. Set top boxes also communicate with content servers to manage video delivery.
set top box
IP telephone
MGC (Media Gateway Controller)
Internet telephony
28. The exchange of information between the components of a network or system for the purposes of establishing - monitoring - or releasing connections as well as controlling system operations.
H.323 terminal
signaling
VoIP (voice over IP)
softphone
29. The real-time reception and transmission of images and audio among two or more locations.
H.323 gateway
H.323 terminal
MGCP (Media Gateway Control Protocol)
videoconferencing
30. A protocol used for communication between media gateway controllers and media gateways. MGCP is defined in RFC 2507 but it was never officially adopted as a standard. MGCP is currently the most popular media gateway control protocol used on converged
Webcast
H.245
MGCP (Media Gateway Control Protocol)
video-on-demand
31. A cost-saving benefit that results from organizations completing long-distance telephone calls over their packet-switched networks - thus bypassing tolls charged by common carriers on comparable PSTN calls.
videoconferencing
video phone
toll bypass
DiffServ (Differentiated Service)
32. A service in which television signals from broadcast or cable networks travel over packet-switched networks.
IPTV (IP television)
H.245
EF (Expedited Forwarding)
DiffServ (Differentiated Service)
33. On a SIP network - a server that accepts requests for location information from user agents - then queries the nearest registrar server on behalf of those user agents. If the recipient user agent is in the SIP proxy server's domain - then that server
video over IP
proxy server
video phone
MEGACO
34. A service that relies on a DSL connection to transmit packetized voice signals.
VoDSL (voice over DSL)
DiffServ (Differentiated Service)
MEGACO
set top box
35. A computer configured to act like an IP telephone. Softphones present the caller with a graphical representation of a telephone dial pad and can connect to a network via a LAN - WAN - PPP dial-up connection - or leased lined.
H.323 terminal
RTP (Real-time Transport Protocol)
VoIP (voice over IP)
softphone
36. A service in which video signals are compressed and delivered over the Internet in a continuous stream so that a user can watch and listen even before all the data has been transmitted.
registrar server
EF (Expedited Forwarding)
streaming video
softphone
37. A companion protocol to RTP - defined in RFC 3550 by the IETF - RTCP provides feedback on the quality of a call or videoconference to its participants.
SS7 (Signaling System 7)
media gateway
H.323 zone
RTCP (Real-time Transport Control Protocol)
38. In SIP terminology - a server that responds to user agent clients' requests for session initiation and termination.
RSVP (Resource Reservation Protocol)
user agent server
unified messaging
H.323 gatekeeper
39. A set of standards established b the ITU for handling call signaling on the PSTN (public switch telephone network).
SS7 (Signaling System 7)
user agent client
softphone
media gateway
40. On a network following the H.323 standard - a gateway that provides translation between network devices running H.323 signaling protocols and devices running other types of signaling protocols (for example - SS7 on te PSTN).
fax gateway
SIP (Session Initiation Protocol)
softphone
H.323 gateway
41. A service that uses the ATM network access method (and ATM cells) to transmit voice signals over a network.
VoATM (voice over ATM)
MEGACO
SIP (Session Initiation Protocol)
IP-PBX
42. A computer that manages multiple media gateways and facilitates the exchange of call control information between these gateways.
user agent server
FoIP (fax over IP)
video-on-demand
MGC (Media Gateway Controller)
43. A collection of H.323 terminals - gateways - and MCU's that are managed by a single H.323 gatekeeper.
EF (Expedited Forwarding)
H.323 gateway
toll bypass
H.323 zone
44. A type of phone that includes a screen and can decode compressed video and interpret transport and signaling protocols necesary for conducting videoconference session.
VoATM (voice over ATM)
MGCP (Media Gateway Control Protocol)
H.323
video phone
45. A gateway capable of accepting connections from multiple devices (for example - IP telephones - traditional telephones - IP fax machines - traditional fax machines - and so on) and translating analog signals into packetized - digital signals - and vi
media gateway
IP telephone
toll bypass
proxy server
46. In SIP terminology - any client - server - or gateway communicating on the network.
VoATM (voice over ATM)
H.323 zone
media gateway
endpoint
47. A compter that provides support for multiple H.323 terminals (for example - serveral workstations participating in a videoconference) and manages communication between then. An MCU is also known as a video bridge.
video-on-demand
MCU (multipoint control unit)
H.225
H.323 gateway
48. The provision of telephone service over the Internet.
redirect server
VoIP (voice over IP)
Internet telephony
videoconferencing
49. A transport layer protocol used with voice and video transmission. RTP operates on top of UDP and provides information about packet sequenceto help receiving nodes detect delay and packet loss. It also assigns packets a timestamp that corresponds to
RTP (Real-time Transport Protocol)
VoATM (voice over ATM)
endpoint
user agent server