solution hw 3 - Another possible sequence is 1 1 2 1 1 3 1...

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CECS7130 – S21 - Advanced Networks Prof. Torres Homework #2 Solutions R10 RTP streams in different sessions: different multicast addresses. RTP streams in the same session: SSRC field. RTP packets are distinguished from RTCP packets by using distinct port numbers. Problem 16 a) As discussed in Chapter 2, UDP sockets are identified by the two-tuple consisting of destination IP address and destination port number. So the two packets will indeed pass through the same socket. b) Yes, Alice only needs one socket. Bob and Claire will choose different SSRC’s, so Alice will be able distinguish between the two streams. Another question we could have asked is: How does Alice’s software know which stream (i.e. SSRC) belongs to Bob and which stream belongs to Alice? Indeed, Alice’s software may want to display the sender’s name when the sender is talking. Alice’s software gets the SSRC to name mapping from the RTCP source description reports. Problem 20 a) One possible sequence is 1 2 1 3 1 2 1 3 1 2 1 3 …
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Unformatted text preview: Another possible sequence is 1 1 2 1 1 3 1 1 2 1 1 3 1 1 2 1 1 3 … b) 1 1 2 1 1 2 1 1 2 1 1 2 … Problem 21 a) Packet Time leaving the queue Delay 1 0 0 2 1 1 3 2 1 4 3 2 5 5 2 6 4 2 7 6 3 8 7 2 9 8 3 10 9 2 11 10 2 12 11 3 Average Delay 1.91 b) Packet Time leaving the queue Delay 1 0 0 2 2 2 3 1 0 4 6 5 5 3 0 6 7 5 7 4 1 8 9 4 9 5 0 10 10 3 11 8 0 12 11 3 Average Delay 1.91 c) Packet Time leaving the queue Delay 1 0 0 2 2 2 3 4 3 4 1 0 5 3 0 6 6 4 7 5 2 8 7 2 9 9 4 10 11 4 11 8 0 12 10 2 Average Delay 1.91 d) Packet Time leaving the queue Delay Note 1 0 0 WFQ 2 2 2 WFQ 3 1 0 WFQ 4 5 4 WFQ 5 3 0 WFQ 6 7 5 Idealized WFQ scheduling 7 4 1 WFQ 8 9 4 WFQ 9 6 1 Idealized WFQ scheduling 10 10 3 WFQ 11 8 0 WFQ 12 11 3 WFQ Average Delay 1.91 e) It can be noticed that the average delay for all four cases is the same (1.91 seconds). Problem 26 See figure below. For the second leaky bucket, . 1 , b p r Figure: Solution to problem 26...
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solution hw 3 - Another possible sequence is 1 1 2 1 1 3 1...

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