Mid Term Question
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Given below is the detail of a video file which needs to be transferred among two devices in a network where multiple devices are connected with each other using a shared transmission media:
If this file is divided into multiple packets where each packet is 1KB in size then how long will it take (in seconds) to transfer the entire file over a network with a bandwidth capacity of 1Mbps?
Provide your answer with complete calculation steps and proper unit.
To calculate the time required to transfer the entire file over a network
with a bandwidth capacity of 1Mbps, we need to consider the file size and
the network bandwidth.
File size = 25.0 MB
Packet size = 1KB (1 kilobyte)
Bandwidth
capacity = 1Mbps (1 megabit per second)
First, we need to convert the file size and bandwidth to a consistent
unit. Since the file size is given in megabytes (MB) and the bandwidth
capacity is given in megabits per second (Mbps), we need to convert the
file size to megabits (Mb).
1 megabyte (MB) = 8 megabits (Mb)
25.0 MB = 25.0 * 8 = 200.0
Mb
Total number of packets = File size / Packet size
Total number of
packets = 200.0 Mb / 1KB = 200,000 packets
Time to transfer one packet = Packet size / Bandwidth capacity
Time
to transfer one packet = 1KB / 1Mbps = (1 * 8) / 1 = 8 milliseconds
(ms)
Total transfer time = Time to transfer one packet * Total number of
packets
Total transfer time = 8 ms * 200,000 packets = 1,600,000
ms
Total transfer time = 1,600,000 ms / 1000 = 1600 seconds
Therefore, it will take approximately 1600 seconds to transfer the entire file over the network with a bandwidth capacity of 1Mbps.
You are required to use ping command for testing the reachability to www.vu.edu.pk in two phases, for phase 1 you have to use ping command with 10 bytes of data for each packet and for phase 2, you need to send 10,000 bytes of data for each packet. Perform the mentioned task in your computer / laptop, take the screenshots clearly showing ping command and the result for both scenarios (Phase 1 and Phase 2) and paste in the MS Word file as solution. At the end, also compare the results of both scenarios / phases, provide the average time difference in milli-seconds in the same file and upload the file on VU-LMS within the due date.
Here are the steps on how to use the ping command to test the reachability to www.vu.edu.pk in two phases:
1- Open Command Prompt.
2- Type the following command and press Enter:
ping -n 4 www.vu.edu.pk -l 10
This will send 4 pings with 10 bytes of data per packet to www.vu.edu.pk.
3- Observe the results of the ping command. The following information will be displayed:
- The IP address of the website
- The number of packets sent
- The number of packets received
- The round-trip time (RTT) for each packet
1- Repeat steps 1 and 2, but this time use the following command:
ping -n 4 www.vu.edu.pk -l 10000
This will send 4 pings with 10,000 bytes of data per packet to www.vu.edu.pk. 2- Observe the results of the ping command. The following information will be displayed:
- The IP address of the website
- The number of packets sent
- The number of packets received
- The round-trip time (RTT) for each packet
The results of the ping command will vary depending on your internet connection. However, in general, you should expect to see a longer round-trip time (RTT) for the second scenario (10,000 bytes of data per packet) than for the first scenario (10 bytes of data per packet). This is because it takes longer for the server to process and respond to a larger amount of data.
To calculate the average time difference in milliseconds between the two scenarios, you can use the following formula:
(average time for second scenario - average time for first scenario) / 2
For example, if the average time for the second scenario is 100 milliseconds and the average time for the first scenario is 50 milliseconds, then the average time difference in milliseconds is 25 milliseconds.
The ping command is a useful tool for testing the reachability of a website. By using the ping command, you can determine if a website is up and running, and you can also get an estimate of the round-trip time (RTT) between your computer and the website. This information can be helpful in troubleshooting network problems.
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