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