920-803 Practice Test
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NCTS Certification 920-803 Exam.
Exam : Nortel 920-803
Title : Nortel technology standards and protocol for ip telephony solutions
1. 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
2. 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
3. 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
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