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