Computer science homework(networking)

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Given the following information, find the total delay: propagation velocity = 2.5 * 108 distance = 2000 km Six routers in the path, each with a 0.5 ms processing delay Congestion delay due to queuing = 3.4 ms Transmission delay is negligible (Points : 5)

6.408 ms 14.4 ms 18.4 ms 5.8 ms none of the above

3. (TCO 1) Suppose that a message is segmented into 3000 packets, with each packet being 1000 bytes. Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rate (R1) between the sending host and the switch is 10 Mbps, and between the receiving host and the switch (R2) it is 10 Mbps. Also assume that the switch uses store and forward packet switching and when the first packet is being sent from the switch to the receiving host, the second packet is being sent from the sending host to the switch. What is the end-to-end delay to send all packets? (In this question, ignore queuing, propagation delay, and processing delay.) (Points : 5)

2.4 s 300.1 ms 2.4008 s 300 ms none of the above

1. (TCO 4) Based on the information shown in the figure, complete the Link-State routing table. Link-State Routing Figure

Step	N’	D(v), p(v)	D(w), p(w)	D(x), p(x)	D(y), p(y)	D(z), p(z)
0	u
1	ux
2	uxv
3	uxvy
4	uxyvw
5	uxyvwz

(Points : 20)

Question 2.2. (TCO 4) Based on the figure shown, fill in the tables for the first iteration and the final iteration for Node “e” using the Bellman-Ford routing algorithm. Distance-Vector Routing Figure

	a	b	c	d	e
a
b
c
d
e

Starting Node “e” Table

	a	b	c	d	e
a
b
c
d
e

Final Node “e” Table (Points : 20)

Question 3.3. (TCO 6) Using the figure provided, compute the estimated delay and the estimated deviation of the delay from the estimated average with u = 0.15 for the packets identified in the table.

Packet Number	ri – ti	di	vi
1	7	7	0
2
3
4
5
6

(Points : 20)

Question 4.4. (TCO 6,8) Who created H.323? Explain its purpose. (Points : 15)

Question 5.5. (TCO 3) At what layer does end-to-end congestion control operate? Explain how it works. (Points : 15)

Question 6.6. (TCO 2) Look at the captured Wireshark string of ASCII characters for an HTTP GET message. Looking at the provided text, determine which browser is being used for this request. GET /cs453/index.html HTTP/1.1 Host: yahoo.business.com/index User-Agent: Mozilla/5.0 (Windows;U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) Accept:ext/xml, application/xhtml+xml, text/html;q=0.9, text/plain;q=0.8, image/png,*/*;q=0.5 Accept-Language; en-us, en;q=0.5 Accept-Encoding: zip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7 Keep-Alive: 300 Connection: keep-alive (Points : 15)