Question

Please Answer all Questions on Networks, They all involve calculation ( 1-9 Questions)

1. "A single router is transmitting packets, each of length L bits, over a single link with transmission rate R Mbps to another router at the other end of the link. Suppose that the packet length is L= 12000 bits, and that the link transmission rate along the link to router on the right is R = 1000 Mbps. What is the maximum number of packets per second that can be transmitted by the link (use a whole number)?"

2. A user needs to transmit a file of 1.5 GB to a server. What will the transmission delay be? using A Wi-Fi transmission rate of 100 Mbps (round off to the nearest seconds) (remember to convert bytes to bits):

3. Hosts A and B are 20 000 km away from each other. The propagation speed of the link between them is 25000 mps. The data is placed onto the link at a rate of 8 kbps. The size of the packet of data that needs to be transmitted is 200 bytes. What is the propagation delay in seconds?

4. "Host A is sending a file to Host B. There are 3 links (therefore 2 switches) between the hosts. The file is segmented into packets of 40 bytes, with a 10-byte header added to each packet. Each link has a transmission rate of 100 kbps and a speed of 1000 km per sec. The switches are 100km away from each other. Host A is 50 km away from the first switch while Host B is 150 km away from the second switch. Data travels from Host A to the first switch, on to the second switch and then to Host B. What is the size of the packet in bits?"

5. "Host A sends real time voice to Host B over a packet switched network. Host A first

converts the analogue voice signal to a digital signal at a rate of 64 kbps. Host A then creates packets of data where each packet contains 56 bytes. Once a packet is created by Host A, it is sent to Host B over a link that operates at a 2 Mbps transmission rate. The propagation delay is 10 milliseconds. (Remember to convert bytes to bits). How many seconds does it take to create a packet of data?"

6. A file of size F = 8 Gbits needs to be distributed to10 peers. Suppose the server has an upload rate of u = 68 Mbps, and that the 10 peers have upload rates of: u1 = 20 Mbps, u2 = 22 Mbps, u3 = 12 Mbps, u4 = 19 Mbps, u5 = 25 Mbps, u6 = 24 Mbps, u7 = 18 Mbps, u8 = 11 Mbps, u9 = 14 Mbps, u10 = 30 Mbps, and download rates of: d1 = 28 Mbps, d2 = 30 Mbps, d3 = 12 Mbps, d4 = 20 Mbps, d5 = 18 Mbps, d6 = 15 Mbps, d7 = 14 Mbps, d8 = 34 Mbps, d9 = 20 Mbps, d10 = 34 Mbps. What is the minimum time needed to distribute this file from the central server to the 10 peers using the client-server model (round to the nearest second)?

7. A web server has a file of size 850000 bits. On average, the file is downloaded from the server by clients 30 times per second. The server is linked to the internet over a link that operates at a rate of 15Mbps. Ignoring all other possible delays, what is the average response time for each user (in seconds)?

8. You request a webpage that consists of a text document and five images. The text document is 1 kilobyte in size while each of the images are 50 kilobytes. The download rate is 1 Mbps and the RTT is 100 msec. Ignoring the time taken for the DNS query, how long will it take to obtain the entire webpage using a non-persistent HTTP connection (in seconds, to 3 decimal places)?

9. "Host A is sending a file to Host B. There are 3 links (therefore 2 switches) between the hosts. The file is segmented into packets of 40 bytes, with a 10-byte header added to each packet. Each link has a transmission rate of 100 kbps and a speed of 1000 km per sec. The switches are 100km away from each other. Host A is 50 km away from the first switch while Host B is 150 km away from the second switch. Data travels from Host A to the first switch, on to the second switch and then to Host B. What is the total transmission delay (in seconds) experienced?"

Answer 1

In case of any doubt please comment, I am happy to assist you.

Solution:

Answered only 1,2,3,5 & 7.

Sorry, For remaining questions don't have enough knowledge to answer.

Thank you, Have a great day:-)