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Internetworking with TCP/IP: Pearson New International Edition

Douglas E. Comer

Chapter 26

Voice And Video Over IP (RTP, RSVP, QoS) - all with Video Answers

Educators

Chapter Questions

Problem 1

Read about the Real-Time Streaming Protocol, RTSP. What are the major differences between RTSP and RTP?

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Problem 2

Find out how the Skype voice telephone service operates. How does it set up a connection?

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Problem 3

Network operators have an adage: you can always buy more bandwidth, but you can't buy lower delay. What does the adage mean?

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Problem 4

If an RTP message arrives with a sequence number far greater than the sequence expected, what does the protocol do? Why?

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01:56

Problem 5

Consider a video shot from your cell phone and transferred over the Internet in real time. How much capacity is required? (Hint: what is the resolution of the camera in your cell phone?)

Aaron Goree
Aaron Goree
Numerade Educator

Problem 6

Consider a conference telephone call that uses RTP to connect $N$ users. Give two possible implementations that could achieve the call.

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Problem 7

A movie usually has two conceptual streams: a video stream and an audio stream. How can RTP be used to transfer a movie?

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Problem 8

Are sequence numbers necessary in RTP, or can a timestamp be used instead? Explain.

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01:20

Problem 9

An engineer insists that "SIP is for children; grown-ups all use H.323." What does the engineer mean? Guess the type of company for which the engineer works.

James Kiss
James Kiss
Numerade Educator
01:53

Problem 10

When VoIP was first introduced, some countries decided to make the technology illegal. Find out why.

Doris Bennett
Doris Bennett
Numerade Educator

Problem 11

Would you prefer an Internet where QoS was required for all traffic? Why or why not?

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Problem 12

Measure the utilization on your connection to the Internet. If all traffic required QoS reservation, would service be better or worse? Explain.

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02:12

Problem 13

Suppose you are asked to set up DiffServ classes for a cable ISP. The ISP's network, which only uses IPv6, must handle: broadcast television channels, voice (i.e., VoIP), movie download, residential Internet service, and streaming video on demand. How do you assign DiffServ classes? Why?

Aman Gupta
Aman Gupta
Numerade Educator

Problem 14

If the input to a traffic shaper is extremely bursty (i.e., sporadic bursts of packets with fairly long periods of no traffic), the output from the shaper may not be steady. What technique can be used to guarantee smooth output? (Hint: consider a method described in a previous chapter.)

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