System Administrator

1. As a system administrator you have noticed that usage peaks between 10:00AM to 5:00PM and between 7:00PM to 10:00PM. The company's CEO decided to call on you to design a system where during these peak hours there will be three levels of users. Users in level 1 are to enjoy better response time than users in level 2, who in turn will enjoy better response time than users in level 3. You are to design such a system so that all users will still get some progress, but with the indicated preferences in place. 1. Will a fixed priority scheme with pre-emption and 3 fixed priorities work? Why, or why not? 2. Will a UNIX-style multi-feedback queue work? Why, or why not? 3. If none of the a... click for more

Points to consider when using an open source operating system such as Linux

What are some factors to examine when considering the use of an open source operating system such as Linux?

Process Synchronization

We have 3 reusable resources. A,B,C. We have 3 process X,Y,Z, and each one of them uses periodically 2 of these 3 resources. Proc. X takes A, then B and then uses both A,B and then releases them. Proc. Y takes B, then C and then uses both B,C and then releases them. Proc. Z takes C, then A and then uses both C,A and then releases them. If 2 of the processes run “parallel” can we have deadlock? If yes, describe the scenario. If 3 of the processes run “parallel”, describe a scenario with a deadlock.

Linux commands

1. Practice the following commands on the Linux machine and write a report on how you used them (screenshot will be fine): ls, cat, man, hexdump, xxd, dd, grep, md5sum, sha1sum, strings For several of the commands, you need to practice them on some files. Some default files are pre-installed in your home directory already, which will be sufficient for this assignment.

Protocol Questions

1. Since T-1 and T-3 connections are capable of supporting multiple digital phone lines does that mean that VOIP can support more than one phone line to a business or home? 2. What is the difficulty(s) of securing a standard telecommunications line vs. securing a VOIP connection? 3. The popularity of VOIP has been growing over the years but it took some time for it to catch on. Why do you think it took so long for it to become accepted? 4. What type of DNS record generally allows SMTP servers to be found using DNS? 5. Name three SMTP server programs and three SMTP Mail User Agents (MAUs)? 6. What layer would the NNTP protocol be on the OSI Model? 7. What protocol did N... click for more