Product Description
Exam Number/Code: 920-803
Exam name: technology standards and protocol for ip telephony solutions
920-803 test is the important of Nortel certifaction. Only you pass the 920-803 exam you could have the chance to get Nortel certifaction. To help examinee, Exambible publish the Questions and Answers about 920-803 exam. And the 55 simulation exam are all designed by expert from Exambible. Examinees could have an enough prepare by these simulation exercises and pass the 920-803 test successfully.
Exambible also provide free 920-803 Demo, examinees can download and use before buying 920-803 Q&As, then decide if they need to purchase.
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Nortel NCSS 920-803 Web Demo
This webdemo is just a demo data, only for reference and learning, there is no other purposes.
1. A video conference is in progress between two networked locations
using gigabit Ethernet. The video conferencing application is using User
Datagram Protocol (UDP) to transport the video and audio data. Why
should UDP be used instead of Transmission Control Protocol (TCP)?
A. TCP CANNOT handle streaming data applications.
B. UDP is better than TCP at seamlessly synchronizing voice and video
together.
C. UDP serves as an efficient transport for handling real-time
application traffic.
D. UDP uses less bandwidth than TCP in a WAN, but more bandwidth than
TCP in a LAN.
Answer: C
2.To achieve the QoS necessary to deliver voice between two points on a
Frame Relay network, which two items are required to guarantee that
voice quality is maintained? (Choose two.) Assume that a Permanent
Virtual Circuit (PVC) is available to address converged voice and data.
A. a Variable Bit Rate (VBR) service type
B. a WAN access device that shapes traffic
C. a WAN access device that does NOT fragment voice IP packets
D. a WAN access device that can manage First-In, First-Out (FIFO)
queuing
E. a Committed Information Rate (CIR) large enough to address the total
peak voice traffic plus a portion allocated for Best-Effort (BE) data
Answer: BE
3. Which two CODECs have the least delay (processing or algorithmic)?
(Choose two.)
A. B. 711
C. D. 723.1
E. F. 726
G. H. 729
Answer: AE
4. To implement VoIP on a customer's IP network, which transport
protocol should you use to best meet the real-time requirement for VoIP,
and why?
A. User Datagram Protocol (UDP); It ignores lost packets.
B. Transmission Control Protocol (TCP); It retransmits lost packets.
C. User Datagram Protocol (UDP); The amount of delay time is bounded.
D. Transmission Control Protocol (TCP); The amount of delay time is
bounded.
Answer: A
5. How does Real-Time Control Protocol (RTCP), the control protocol of
Real-Time Protocol (RTP), assist RTP in handling packetized voice in an
IP telephony environment?
A. Controls the RTP data flows.
B. Identifies sources and provides QoS feedback.
C. Interoperates with Transmission Control Protocol (TCP).
D. Controls the network bandwidth used by RTP data flows.
Answer: B
6. Which CODEC delivers the greatest compression?
A. B. 711
C. D. 723.1
E. F. 726
G. H. 729
I. J. 729A
Answer: C
7. The basic attributes of Real-Time Protocol (RTP) provide for support
of applications like voice and video. Which three attributes of RTP
support real-time applications? (Choose three.)
A. Timestamping
B. Packet sequencing
C. Header compression
D. Payload identification
E. Packet retransmission
Answer: ABD
8. What are two differences between IP, Asynchronous Transfer Mode (ATM)
and Frame Relay (FR)? (Choose two.)
A. ATM has a fixed cell size, but IP and FR do NOT.
B. FR has built in mechanisms within the protocol for QoS.
C. ATM is connectionless, but IP and FR are connection oriented.
D. IP is a Layer 3 protocol, but ATM and FR are Layer 2 protocols.
Answer: AD
