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