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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 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.
H.245
PBX (private branch exchange)
VoDSL (voice over DSL)
user agent server
2. 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
IP-PBX
H.323 zone
H.323
MGC (Media Gateway Controller)
3. A set of standards established b the ITU for handling call signaling on the PSTN (public switch telephone network).
SS7 (Signaling System 7)
Webcast
H.225
H.323 gatekeeper
4. 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.
user agent client
toll bypass
set top box
H.323 terminal
5. 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.
toll bypass
DiffServ (Differentiated Service)
registrar server
MGCP (Media Gateway Control Protocol)
6. A computer that manages multiple media gateways and facilitates the exchange of call control information between these gateways.
fax gateway
proxy server
video-on-demand
MGC (Media Gateway Controller)
7. A service that uses the ATM network access method (and ATM cells) to transmit voice signals over a network.
VoATM (voice over ATM)
fax gateway
RTCP (Real-time Transport Control Protocol)
endpoint
8. The real-time reception and transmission of images and audio among two or more locations.
H.323
videoconferencing
video phone
H.225
9. 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.
video-on-demand
RTCP (Real-time Transport Control Protocol)
signaling
MCU (multipoint control unit)
10. A service in which a video is stored as an encoded file is delivered to a viewer upon his request.
IPTV (IP television)
VoIP (voice over IP)
video-on-demand
user agent client
11. In SIP terminology - a user agent client or user agent server.
Webcast
user agent
RTCP (Real-time Transport Control Protocol)
H.323 zone
12. 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
MGCP (Media Gateway Control Protocol)
PBX (private branch exchange)
DiffServ (Differentiated Service)
SIP (Session Initiation Protocol)
13. 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.
EF (Expedited Forwarding)
set top box
MGC (Media Gateway Controller)
RSVP (Resource Reservation Protocol)
14. 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.
PBX (private branch exchange)
Webcast
streaming video
IPTV (IP television)
15. A telephone used for VoIP on a TCP/IP-based network. IP telephones are designed to transmit and receive only digital signals.
IPTV (IP television)
PBX (private branch exchange)
H.323 gateway
IP telephone
16. 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
RTCP (Real-time Transport Control Protocol)
softphone
RTP (Real-time Transport Protocol)
IP-PBX
17. A service in which television signals from broadcast or cable networks travel over packet-switched networks.
MGCP (Media Gateway Control Protocol)
softphone
IPTV (IP television)
video over IP
18. 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.
RTCP (Real-time Transport Control Protocol)
IP telephone
EF (Expedited Forwarding)
AF (Assured Forwarding)
19. An interal or externally attached adapter that converts analog telephone signals into packet-switched voice signals and vice-versa.
VoIP (voice over IP)
ATA (analog telephone adapter)
proxy server
H.245
20. In SIP terminology - any client - server - or gateway communicating on the network.
IP telephone
endpoint
MCU (multipoint control unit)
user agent server
21. 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
Internet telephony
MEGACO
registrar server
toll bypass
22. A service that relies on a DSL connection to transmit packetized voice signals.
SIP (Session Initiation Protocol)
RTP (Real-time Transport Protocol)
IP-PBX
VoDSL (voice over DSL)
23. The provision of telephone service over the Internet.
Internet telephony
media gateway
EF (Expedited Forwarding)
RTP (Real-time Transport Protocol)
24. In SIP terminology - end-user devices such as workstations - PDAs - cell phones - or IP telephones. A user agent client initiates a SIP connection.
user agent client
endpoint
streaming video
fax gateway
25. 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 phone
proxy server
Webcast
EF (Expedited Forwarding)
26. In SIP terminology - a server that responds to user agent clients' requests for session initiation and termination.
toll bypass
set top box
registrar server
user agent server
27. 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
SIP (Session Initiation Protocol)
videoconferencing
softphone
H.225
28. A service that transmits faxes over TCP/IP network.
user agent
Webcast
VoATM (voice over ATM)
FoIP (fax over IP)
29. 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.
IP-PBX
DiffServ (Differentiated Service)
proxy server
redirect server
30. The provision of telephone service over a packet-switched network running the TCP/IP protocol suite.
set top box
PBX (private branch exchange)
user agent client
VoIP (voice over IP)
31. 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).
unified messaging
SIP (Session Initiation Protocol)
H.323 gateway
videoconferencing
32. A type of phone that includes a screen and can decode compressed video and interpret transport and signaling protocols necesary for conducting videoconference session.
softphone
Webcast
videoconferencing
video phone
33. A streaming video - either on demand or live - that is delivered via the Web.
AF (Assured Forwarding)
Webcast
PBX (private branch exchange)
H.323
34. 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.
H.323 gateway
video over IP
redirect server
H.245
35. 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.
signaling
MGC (Media Gateway Controller)
fax gateway
RSVP (Resource Reservation Protocol)
36. On a network following the H.323 standard - any node that provides audio - visual - or data information to another node.
set top box
H.323 terminal
AF (Assured Forwarding)
H.245
37. A collection of H.323 terminals - gateways - and MCU's that are managed by a single H.323 gatekeeper.
MEGACO
Internet telephony
H.323 zone
H.323 gateway
38. 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
EF (Expedited Forwarding)
video-on-demand
redirect server
video phone
39. 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.
SIP (Session Initiation Protocol)
IPTV (IP television)
fax gateway
toll bypass
40. 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.
Webcast
AF (Assured Forwarding)
MEGACO
softphone
41. 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
PBX (private branch exchange)
RTCP (Real-time Transport Control Protocol)
user agent server
DiffServ (Differentiated Service)
42. 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.
MCU (multipoint control unit)
H.323
EF (Expedited Forwarding)
IP-PBX
43. 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.
H.323 gatekeeper
user agent client
IP telephone
proxy server
44. 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.
MGC (Media Gateway Controller)
H.225
softphone
Internet telephony
45. An ITU standard that describes an architecture and a suite of protocols for establishing and managing multimedia services sessions on a packet-switched network.
H.323
video phone
EF (Expedited Forwarding)
AF (Assured Forwarding)
46. 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
video-on-demand
video phone
endpoint
47. A telephone switch used to connect calls within a provate organization.
VoIP (voice over IP)
unified messaging
RTCP (Real-time Transport Control Protocol)
PBX (private branch exchange)
48. The centralized management of multiple types of network-based communications - such as voice - video - fax - and messaging services.
unified messaging
MGCP (Media Gateway Control Protocol)
Webcast
VoATM (voice over ATM)
49. 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
Internet telephony
SIP (Session Initiation Protocol)
VoATM (voice over ATM)
DiffServ (Differentiated Service)