Network+ VoIP
- 1.
You have decided to establish a VoIP system in your home. Which of the following devices is necessary to connect your analog telephone to your VoIP server?
- A.
ATA
- B.
IP-PBX
- C.
Softphone
- D.
Codec
Correct Answer
A. ATA -
- 2.
Skype, the popular Internet telephony service, provides a user with what type of interface?
- A.
IP phone
- B.
Analog telephone
- C.
IP-PBX
- D.
Softphone
Correct Answer
D. Softphone -
- 3.
A company's use of VoIP on it WAN to avoid long distance telephone charges is known as:
- A.
Circuit redirect
- B.
WAN redirect
- C.
Fee gauging
- D.
Toll bypass
Correct Answer
D. Toll bypass -
- 4.
Which of the following is the most popular signaling protocol used on tradional, circuit-switched PSTN connections?
- A.
SS7
- B.
SIP
- C.
H.323
- D.
MEGACO
Correct Answer
B. SIP -
- 5.
Watching a YouTube video on the Web is an example of which of the following types of video-over-IP services?
- A.
Videoconferencing
- B.
IPTV
- C.
Streaming video
- D.
IP multicasting
Correct Answer
C. Streaming video -
- 6.
In an IPTV system, which of the following functions does a set top box perform?
- A.
Interprets multicast routing protocols to determine the most efficient means of distributing video signals.
- B.
Determines the appropriate amount of bandwidth necessary to deliver a requested video and adjusts the connection accordingly.
- C.
Decodes video signals and issues them to a television.
- D.
Generates video content based on a subscriber's channel selection
Correct Answer
C. Decodes video signals and issues them to a television. -
- 7.
What type of video-over-IP service relies on full-duplex communication?
- A.
Streaming video
- B.
Videoconferencing
- C.
Webcasting
- D.
IPTV
Correct Answer
B. Videoconferencing -
- 8.
What protocol manages addressing for multicast groups?
- A.
IGMP
- B.
MGCP
- C.
MEGACO
- D.
H.245
Correct Answer
A. IGMP -
- 9.
Which of the following protocols would be used by a video bridge to invite a video phone to join a videoconference?
- A.
MGCP
- B.
IGMP
- C.
H.225
- D.
RSVP
Correct Answer
C. H.225 -
- 10.
Suppose your organization's PSTN and VoIP systems are integrated, and that your VoIP system adheres to architecture specified in H.323. Which of the following performs translation between the PSTN's signaling protocols and H.323 on your network?
- A.
H.323 terminal
- B.
H.323 gateway
- C.
H.323 gatekeeper
- D.
H.323 zone
Correct Answer
B. H.323 gateway -
- 11.
You are using Skype to initiate a video call with a friend in another state. Which of the following protocols is generating segments at the Transport layer of this transmission?
- A.
ICMP
- B.
UDP
- C.
FTP
- D.
TCP
Correct Answer
B. UDP -
- 12.
What function does the H.225 protocol provide, as part of the H.323 VoIP specification?
- A.
Controls communication between media gateways and media gateway controllers
- B.
Handles call setup, call routing, and call termination
- C.
Ensures that signals issued to an H.323 terminal are in a format that the terminal can interpret
- D.
Indicates priority of each IP datagram
Correct Answer
B. Handles call setup, call routing, and call termination -
- 13.
In SIP, which of the following network elements maintains a database with network address information for every SIP client?
- A.
Redirect server
- B.
Registrar server
- C.
Domain server
- D.
Proxy server
Correct Answer
B. Registrar server -
- 14.
Which of the following devices enable multiple media gateways to communicate?
- A.
MGC
- B.
IP-PBX
- C.
VoIP router
- D.
IP phone
Correct Answer
A. MGC -
- 15.
Which of the following are reasons for choosing SIP over H.323? (Choose two)
- A.
SIP is an older, more reliable standard
- B.
SIP has limited functionality, which makes it more flexible
- C.
SIP messages use fewer processing resources
- D.
SIP includes QoS mechanisms that make it more dependable
- E.
SIP supports a wider range of voice and video codecs
Correct Answer
C. SIP messages use fewer processing resources -
- 16.
At what layer of the OSI model does RTP operate?
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
Correct Answer
A. Application -
- 17.
What can RTCP do that RTP cannot?
- A.
Issue timestamps for every transmission
- B.
Assign sequence numbers to each packet in a transmission
- C.
Report on the degree of packet loss and delay in a connection
- D.
Modify each IP datagram to assign a priority level
Correct Answer
C. Report on the degree of packet loss and delay in a connection -
- 18.
How does RSVP help improve QoS?
- A.
It assigns a label to each IP datagram that will be read and modified by every router in the data's path
- B.
It establishes a path between the sender and receiver that is guaranteed to supply sufficient bandwidth for the transmission
- C.
It modifies the Priority field in each IP datagram so that high-bandwidth applications are given precedence over low-bandwidth applications
- D.
It continually assesses the status of likely routes in the transmission's path and dynamically modifies IP datagrams as they're issued with instructions for following the best path
Correct Answer
B. It establishes a path between the sender and receiver that is guaranteed to supply sufficient bandwidth for the transmission -
- 19.
On a VoIP network that uses the DiffServ QoS technique, which of the following makes certain that a router forwards packets within a given time period?
- A.
Assured Forwarding
- B.
Superior Forwarding
- C.
Expedited Forwarding
- D.
Best-effort Forwarding
Correct Answer
C. Expedited Forwarding -
- 20.
The Traffic Class field in an IPv6 datagram serves the same function as which of the following fields in an IPv4 datagram?
- A.
TTL
- B.
DiffServ
- C.
RSVP
- D.
Padding
Correct Answer
B. DiffServ -
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Current Version
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Jul 30, 2011Quiz Edited by
ProProfs Editorial Team -
Apr 21, 2011Quiz Created by
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