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