Questions from students, looking for advice for their homework.

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19
votes
6answers
550 views

Protecting kids online

My eldest child is at the age where she will start using the web for school work and general interest. What can I do to protect her from encountering inappropriate content, while browsing the web ...
11
votes
6answers
4k views

What is virtual memory? Clarification Needed

I was double checking my notes for 'Virtual Memory' and the definition in my text book is: Process of allocating a section of secondary storage to act as part of the main memory Where as ...
8
votes
2answers
6k views

Linux bash: when to use egrep instead of grep?

I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what ...
7
votes
3answers
933 views

hard drive sectors vs. tracks

In one rotation, how many sectors are passed over and how many tracks are passed over? If you know the average value of sectors per track for a hard drive, how do you use this to estimate the number ...
5
votes
2answers
869 views

How to create a file with a “#” character in the name in Unix?

I've tried many commands already for creating a file and deleting a file with a # character, but it does not work. Can anyone tell me the command to create and then delete a file that begins with #?
5
votes
1answer
929 views

How do I calculate the bytes per track based on the transfer rate?

If you know the transfer rate, how do you calculate the bytes per track?
5
votes
1answer
4k views

rotational latency

If you know the RPM, then how do you calculate the rotational latency?
5
votes
7answers
3k views

Interesting internet-based Linux projects for students

I'm a teacher leading an Introduction to Linux class. I've been doing the class for about eight years and over time I've tried to keep the projects relatively up-to-date. But this year I want to ...
4
votes
4answers
550 views

how to create a file and delete a file using “-” symbol

How would you create and then delete a file that begins with the symbol "-"? Try it. I can't write the command for this question and I don't why. Can anyone help me?
3
votes
4answers
889 views

Unix Interview Question

I am giving some interviews right now and recently I was asked this questions in Interview and I was not sure of the answer, in your opinion are this kind of questions worthwhile for Interview process ...
3
votes
2answers
313 views

sectors and clusters

Are the sectors in a cluster all next to each other?
3
votes
1answer
342 views

number of tracks

If you know the disk capacity, bytes per track, and number of surfaces, then how do you calculate the number of tracks?
3
votes
2answers
3k views

Linux Command Line: Sort, Grep, Less commands

How do I go about doing this: Using the sort, grep and less commands (connected with a pipe), sort the /etc/passwd file in alphabetical order and display only the lines ending in the word "false".
3
votes
1answer
255 views

transfer time of a cylinder

How do you figure out the transfer time of a cylinder?
3
votes
1answer
220 views

transfer time for a file

If you know the seek, rotational delay and transfer rate, how do you calculate the transfer time for a file with a given total size and cluster size?
3
votes
1answer
132 views

Configuring subnets quandry

I am learning the basics of subnetting however am faced with a dilemma on approaching the issue. For example I have been tasked to set up a network with 20 hosts using a Class C network addressing ...
3
votes
3answers
3k views

Finding multiple file extensions in command prompt window

I am trying to use multiple parameters to find 3 different extensions in my windows/system32 in one command: .exe, .dll and .sys This is giving me what I want, but I can't figure out how to get all 3 ...
2
votes
5answers
6k views

Can you have a class C IP address with a subnet mask of 255.255.0.0?

Can you have a class C IP address with a subnet mask of 255.255.0.0? What happens when you have a setting like this?
2
votes
5answers
804 views

What parts of the OS are the most important?

I've got an assignment to complete where I compare two operating systems of equal vintage, however my instructor hasn't really given me much of a scope for this? He has basically asked for 2000-2500 ...
2
votes
3answers
3k views

Class D ip address

Is there mask for class D ip address? As it is for multicast, I am not sure about it. I read somewhere that D ip addressas are 32-bit network addresses and they dont have hostID, but in the following ...
2
votes
5answers
3k views

tar - exclude does not work

I've supposed to archive a directory with tar and exclude some files. I have a directory $HOME/java which includes some .java and .class files. What I want to do is exclude all .class files using the ...
2
votes
3answers
360 views

Which memory is accessed by the initialization code on a PC?

CMOS, DRAM, ROM and EPROM are all types of memory found in PC systems. Explain which of these is used to contain the initialisation code and which are accessed by this code. The first answer ...
2
votes
1answer
155 views

Which codec should I choose to work with in a VoIP project? [closed]

I would like to work with a codec in a project for the university. I'm interested in the VoIP telephone service. The idea is to implement the codec in a DSP and then characterize it. My question is ...
2
votes
1answer
225 views

What privilege is required to preserve ownership of a file on copy, and how do you get it?

I have a homework question about kernel programming in Linux. The question is: What Linux-specific privilege is required to preserve ownership of a file when it's copied, and how do you get it? ...
2
votes
3answers
682 views

what is HTML payload?

I have to do an assignment and the following is specified: Extract these items: <content type="HTML"> quoted HTML payload </content> the extraction refers to an XML feed. What exactly ...
2
votes
1answer
222 views

How many subnets are needed?

I'm just starting out with networks. I'm trying to determine how many subnets are needed for this network: BRANCH1, BRANCH2 and HQ are routers. The Boxes between routers and PCs are switches. The ...
2
votes
2answers
2k views

Difference between the Windows and Linux thread scheduler

As far as I can tell, both use: Multilevel feedback queue Priority levels (different range) Both manage threads and not the process But what are the big differences? Thanks
2
votes
5answers
505 views

Work Time Start / Stop Tracking Software [closed]

Is there a software that allows you to keep track of someones working time digitally? We are growing to an extent where we work remotely and we would like to have fixed working times. All it should ...
1
vote
5answers
7k views

Why does 1KB contain 1024 bytes when 1KB = 1000 bytes? [closed]

Why does 1KB equal 1024 bytes? I know that 1KB also stores 1000 bytes. That is, I've been told that 1Kb equals 1024 bytes, but my professor says that it's 1000 bytes and that Linux doesn't use the ...
1
vote
4answers
1k views

(bash) Grep question - how to grep for a line that has the same number you both need and don't need

This isn't at all easy to explain but easy to just show. I have lines in a file such as: 100Dollars 3 IP 200Dollars 3 IP 300Dollars ...
1
vote
2answers
164 views

Is it possible to execute a new application if the CPU Utilization of a computer is 100%?

The CPU Utilization of a computer is 100%. Is it possible to execute a new application under the above condition?
1
vote
3answers
2k views

Using egrep to find lines that have 5-6 Upper Case letters. (but not more than 6)

First off, this is homework and unfortunately I have to use egrep (and not with -w or anything of the like). I need my grep to return lines that have exactly 5 or 6 upper case letters. Doing ...
1
vote
1answer
132 views

Token Ring - is a MAU required?

I'm writing a paper for school on Token Ring, but I'm having trouble discerning something. From what I understand, there are two types of Token Ring networks: wired, and star-wired. I understand ...
1
vote
1answer
1k views

Can I temporarily affect ARP table without using `arp` command directly?

I have some knowledge about arp command under linux which can help modify the ARP table. Now I want to temporarily affect ARP table(add, delete and change) entries without the help of arp. For ...
1
vote
3answers
2k views

What file systems does Windows 2008 support?

I'm doing a schoolwork assignment and I'm currently on the question: "What file systems does Windows 2008 support?" Sounds easy but I dunno if it's a trap. It would be easy to say FAT32, NTFS etc. ...
1
vote
1answer
621 views

What is the purpose of the network id?

I know that for addresses like e.g. 192.168.17.5 with 255.255.255.0 subnet mask, address 192.168.17.0 is the network id and 192.168.17.255 is the broadcast address and that valid hosts are from ...
1
vote
1answer
524 views

retransmission of lost TCP segment

What will happen in the following scenario (assume the connection is already established): (stack A) send 10 byte data (stack B) send ACK for 10 byte data (stack B) send 200 byte data (stack B) send ...
1
vote
1answer
535 views

What is wrong in the Bash script about parameters and Wget?

Runnning the command gives wget_exam -h Usage: wget_exam2 <fileType> <source> exit // then immediately Terminal shut dows The code # example wget_exam2 java ...
1
vote
2answers
80 views

How clocks get synchronized? [closed]

In a syschronus communication between two DTEs, the frames sent are composed of an initial burst of bits (0s and 1s) to force the reciever DTE to synchronize its clock. Is it possible that the ...
1
vote
2answers
1k views

How do I specify a line of text in a text file for a batch file

I am wondering if I can tell the computer to do a command on a text file with a batch file, however i would like to specify whitch line to modify. I do not have any code for this yet and I would be ...
1
vote
1answer
455 views

Where can I find information on group policy compatibility between Windows OS versions?

I am having trouble trying to find information on group policies compatibility between different versions of Windows. I have to find this information for a school assignment I need to complete. Does ...
1
vote
2answers
173 views

maximum size filesystem on my test … approach?

Hello all I'm new at the site, and I have a question. I got this question at a test and really like to know the correct approach to solving this problem? Here is the question. In an indexed ...
1
vote
0answers
23 views

How to determine control/data/address bus width

I am hoping you guys can help. I need to know how to calculate the control bus, address bus, and data bus width of a hypothetical CPU. A computer is word addressable with a 64 bit word size and ...
1
vote
0answers
33 views

Calculate bandwidth for a crossbar system

Not quite sure which StackExchange community this question would fit it. I had an midterm last week where I had a question I still don't quite understand, and I hope to get some help here. So the ...
1
vote
3answers
413 views

Batch file - How to update folder search path for batch script file execution?

The question on the homework sheet is: Update the folder search path for batch script file execution to include the "Processing" subfolder, and then display the folder search path. (Make sure you ...
1
vote
1answer
874 views

virtualbox virtual machine on usb flash drive

In my Linux class, we created virtual machines on flash drives, and installed Lubuntu on them. We are supposed to be able to now run our virtual machines on any computer with oracle vm installed, at ...
1
vote
1answer
111 views

Delete newlines using Stream editor (sed)

I need to write a sed script that places the actual text of the subtitles in a srt file on a single line. If this text originally was split over multiple lines, the line break and possible ...
1
vote
1answer
143 views

Subnetting - how to?

I can't cope with this MS 70-291 Training Kit Task: What is the configuration error in the diagram below and WHY? (btw: I have removed original, wrong mask which was editors error and placed big red ...
1
vote
1answer
877 views

What is the purpose of a routing protocol? [closed]

I'm studying for CCNA 2 exam. Here's one of the questions. I already know the answer. What I am looking for is the reason why the incorrect answers are...incorrect. =) For example, the question is: ...
1
vote
0answers
358 views

Microsoft Project 2007: entering tasks and subtasks

I'm using Microsoft Project 2007 for school. My assignment is a template from the teacher with main tasks and a preset number of days for the duration. When I enter a subtask, put in the number of ...