CS 6553 Performance Evaluation, Spring 1996 Assignment 5

The file /usr/local/courses/cs6553/spring96/netdata contains data about a network link. The link is sampled once a minute to determine whether the link is up or down. Each line of the file contains one measurement with the date and time followed by either the word "up" or "down".

Note that there are gaps in the information. There are periods in which no measurements were made. You are to analyze this data, and draw any conclusions about the link that you can. A conclusion might be in the form: With 95% confidence the average time up is xxx. In addition, note any trends.

To help in this, the file /usr/local/courses/cs6553/spring96/netdata1 contains a summary of this information in a different form. Each line represents the number of consecutive minutes the link was up followed by the number of minutes it was down, followed by the fraction of the time the link is down, followed by the date and time it went down.

Note that changes were made to the system on March 15 at about 9 PM and on March 26 between 5:20 and 6:00 AM.

In addition to any other conclusions you can draw, give arguments for or against each of the following:

Show the calculations you used.