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help3002

This forum is provided to promote discussion amongst students enrolled in CITS3002 Computer Networks.

Please consider offering answers and suggestions to help other students! And if you fix a problem by following a suggestion here, it would be great if other interested students could see a short "Great, fixed it!"  followup message. How do I ask a good question?

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 UWA week 13 (1st semester, week 5) ↓
SVG not supported 3:09pm Wed 27th Mar, Christopher M.

ANONYMOUS wrote You don't ignore the new frames from that node, your DLL simply des not accept them from the layer above until the older frame has been successfully transmitted. (although we're not coding this question in any language), but in cnet ...


SVG not supported 2:57pm Tue 26th Mar, ANONYMOUS

What I meant is that the parameter is the probability that a node has a new frame for transmission , if a specific node is already trying to retransmit, do we ignore any new frames for that node. As in context, I believe a node may be able to get a n...


SVG not supported 2:43pm Tue 26th Mar, Christopher M.

ANONYMOUS wrote We've been discussing Aloha in the context of the data-link layer, with the DLL needing to successfully transmit one frame before beginning the process for the next one. We should complete the re-transmission, before starting a new...


SVG not supported 1:21pm Tue 26th Mar, ANONYMOUS

In the slotted aloha, if a node is looking to retransmit message, does it not consider any new messages it may have to send while trying to retransmit? More specifically, each node has chance to transmit a new message, if a node is trying to retransmi...


 UWA week 12 (1st semester, week 4) ↓
SVG not supported 4:31pm Tue 19th Mar, Christopher M.

ANONYMOUS wrote Either way can work - the best way, initially, is the way that simplest for your to implement and get working. If your frame-types are mutually exclusive, you can give them all distinct values, and just store one of them in a header ...


SVG not supported 12:25pm Tue 19th Mar, ANONYMOUS

Hello Chris, I'm thinking about how I would implement piggybacking. Is it better to combine DL ACK and DL DATA in the header and somehow seperate them at the other end, or is it best to make a seperate FRAMEKIND, like DL DATA ACK, that signifies that ...


 UWA week 11 (1st semester, week 3) ↓
SVG not supported 6:42pm Thu 14th Mar, ANONYMOUS

ive followed the instructions to set up the VcXsrv X-server GUI. Even though I launched it using X-launch, and ran shell export DISPLAY (cat etc resolv.conf grep nameserver awk ' print 2; exit; ') 0.0 , no GUI appeared for me.


SVG not supported 3:56pm Thu 14th Mar, Cameron L.

I would assume that to avoid the two generals problem, corrupt acknowledgment frames are ignored after a point (for simplicity, if not efficiency, I've been ignoring them entirely and allowing them to timeout). But I'm still not sure why a resent corr...


SVG not supported 3:28pm Thu 14th Mar, Cameron L.

On looking further, I assume ber is Bit Error Rate. That doesn't explain why one failed checksum will always resend into another failed checksum, so I'll keep looking.


SVG not supported 3:28pm Thu 14th Mar, Christopher M.

It stands for 'bit error rate' - the probability that one-or-more bits in a frame will be corrupted. Yes, there's an additional problem that needs to be solved. It's easy to detect a damaged frame, and send back a negative-acknowledgement, but what n...


SVG not supported 3:21pm Thu 14th Mar, Cameron L.

Good Afternoon, For Lab 2, STOPANDWAIT2 has a variable called ber, set to 0.00005, is this the probability of frame corruption? If not, how is frame corruption handled in this topology? I've managed to get the Negative Acknowledgement working (or at le...


SVG not supported 3:40am Wed 13th Mar, Christopher M.

Thank you - seems a very good solution (I wonder why Windows, or WSL-2, doesn't actually provide an Xserver as part of their distribution?). I have added this information to our installation instructions - https teaching.csse.uwa.edu.au units CITS30...


SVG not supported 6:27pm Tue 12th Mar, Christopher M.

There really shouldn't be a need to (manually) do any of this. The real problem to be solved is why that cp command can't find a file you've just downloaded into the current directory.


SVG not supported 6:23pm Tue 12th Mar, William S.

For anyone who had the following error when running the 'install-cnet.sh' script cp cannot stat 'cnet-Linux-x86 64' No such file or directory I managed to bypass it by manually running each command of the script on the terminal Linux users 1. downl...


SVG not supported 4:57pm Tue 12th Mar, ANONYMOUS

Thank you it seems to work now


SVG not supported 4:01pm Tue 12th Mar, Uzziah S.

I managed to get mine working by following this blog https nickymeuleman.netlify.app blog gui-on-wsl2-cypress The main issue was that I didn't have an xserver running which meant I couldn't run GUI programs from WSL. This blog uses VcXsvr which ran...


SVG not supported 3:39pm Tue 12th Mar, ANONYMOUS

I have tried to use the export commands but the issue persists, I have also tried using Windows Terminal and I'm still getting the same issue. When running export DISPLAY (awk ' nameserver print 2; exit ' etc resolv.conf 2 dev null) 0 or when r...


SVG not supported 12:03pm Tue 12th Mar, Christopher M.

ANONYMOUS wrote Great if this works. How does WT support manage setting up the windowing, by setting DISPLAY to a known, required value, or by directing a command's graphical output the a display server before the command is even invoked? Anyone else t...


SVG not supported 7:43pm Mon 11th Mar, ANONYMOUS

Install Windows Terminal from the Microsoft Store and set this as the default terminal. Then open CMD in this and run cnet. It should resolve the problem.


SVG not supported 4:13pm Mon 11th Mar, Christopher M.

ANONYMOUS wrote I remember this as a problem that some students had last year but, again, not all students are having it this year. Clearly your DISPLAY variable is set, to 0.0 , but that's not the correct value. Reading stackoverflow, again......


SVG not supported 1:37pm Mon 11th Mar, ANONYMOUS

Hi, I am getting this error when running cnet. I have followed the updated instructions but I still get this error. Error Unable to initialize GTK , is DISPLAY set properly? I have provided a screenshot of the problem below


 UWA week 10 (1st semester, week 2) ↓
SVG not supported 7:05pm Sun 10th Mar, Sebastian G.

oh... duh, an array of bytes makes sense - thanks


SVG not supported 8:26am Sun 10th Mar, Christopher M.

... from https teaching.csse.uwa.edu.au units CITS3002 labsheets labsheet2.php For Labsheets 2-4 we'll be using (my) network simulation software named cnet https teaching.csse.uwa.edu.au units CITS3002 cnet cnet is not installed on laboratory com...


SVG not supported 8:00am Sun 10th Mar, Christopher M.

... from our Schedule page https teaching.csse.uwa.edu.au units CITS3002 schedule.php Sample solutions and discussion will be available every week, and you can raise your thoughts in the Tutorials, too, but I won't make an announcement about them ev...


SVG not supported 11:34am Fri 8th Mar, Christopher M.

Hi Sebastian, For this exercise, we're not really passing frames across a network, and not having the network (possibly) corrupt those frames, we're just simulating emulating all of the actions with a single process on a single computer (no network re...


SVG not supported 1:12pm Thu 7th Mar, Sebastian G.

Hi I have a question about question 4 on Lab sheet one (I would have asked my lab facilitator but my regular lab is on monday and I couldn't attend the other lab sessions sorry ) I am a little confused how to read a file from the drive as if it was g...

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