Learn About Optimizing Converged Cisco Networks

The following questions are from the MeasureUp Practice Test for Cisco’s exam 642-845: Optimizing Converged Cisco Networks (ONT). This exam is one of the requirements for the Cisco Certified Network Professional (CCNP) certification.

The audience for this exam includes individuals who are responsible for optimizing network performance and implementing quality of service (QoS) for converged networks. Experience with implementing QoS and Voice over IP (VoIP) networks will help you prepare for this exam.

Objective: Describe Cisco VoIP implementations.
Sub-objective: Describe and identify basic voice components in an enterprise network (e.g., gatekeepers, gateways, etc.).

Single answer, multiple-choice

Which statement correctly specifies the characteristics of TCP, UDP and RTP with respect to reliability, reordering and time-stamping?

A.    UDP does not provide reliability and reordering, but it does provide time-stamping.
B.    RTP does not provide reliability, but it does provide reordering and time-stamping.
C.    TCP provides reliability, reordering and time-stamping.
D.    RTP provides reliability, reordering and time-stamping.

Answer:
B

Tutorial:
Realtime Transport Protocol (RTP) provides sequence numbering (reordering) and time-stamping, but it does not offer reliability. The reliability feature of TCP is not suitable for voice applications. Therefore, RTP is used to transport digital voice in packet telephony networks.

User Datagram Protocol (UDP) provides no reliability, no sequence numbering (reordering) and no time-stamping. Lack of the latter two features makes UDP unsuitable for transporting voice.

TCP provides reliability and sequence numbering but not time-stamping. Time-stamping is a feature required for transporting…


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