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