http://www.cs.up.ac.za/courses/COS332The objective of this module is to acquaint the student with the terminology of communication systems and to establish a thorough understanding of exactly how data is transferred in such communication networks, as well as applications that can be found in such environments. The study material includes: concepts and terminology, the hierarchy of protocols according to the OSI and TCP/IP models, protocols on the data level, physical level and network level as well as higher level protocols. The practical component of the module involves programming TCP/IP sockets using a high level language. The emphasis throughout is on the technical aspects underlying the operation of networks, rather than the application of networks.http://www.cs.up.ac.za/courses/COS332Due on Monday 28/3/20112011-03-15 12:00:09http://www.cs.up.ac.za/courses/COS332SIT1, on level 4 in the Informatorium, is as from 2011 a lab dedicated to SIT students. This means that SIT 1 is no longer formally scheduled for pracs, and any of our students can use SIT1 at any time during the Informatorium's business hours.2011-03-15 11:06:15http://www.cs.up.ac.za/courses/COS332The semester test will be written during the normal lecture period on Tuesday, 10 May, 2011. However, it will be written in HSB4-1, rather than our normal Tuesday venue.2011-03-15 10:37:10http://www.cs.up.ac.za/courses/COS332The marking session for tomorrow morning from 8:30 - 10:20 will be in BLUE 1 in the Informatorium. Please come early.2011-03-09 16:27:26http://www.cs.up.ac.za/courses/COS332Due Monday 14/3/112011-03-08 12:00:13http://www.cs.up.ac.za/courses/COS332Due Monday 7/3/112011-03-04 21:45:43http://www.cs.up.ac.za/courses/COS332I should have mentioned in class today that the UP firewall blocks DNS queries to servers outside UP. Please try to play with nslookup on your home or other machines. You will only really understand the system once you have resolved many names manually. For those who like a challenge: Use nslookup to determine the problem with example.za.org. If you are stuck inside the UP firewall, try something like dnsquery.org.2011-03-04 15:18:39http://www.cs.up.ac.za/courses/COS332If there are any queries (problems with uploads etc.) contact Francois Mouton on his e-mail directly. Also attach your practical.2011-02-28 11:27:35http://www.cs.up.ac.za/courses/COS332Due Monday 28/2/112011-02-28 06:41:37http://www.cs.up.ac.za/modules/courses/download.php?id=58Initial content of http://netw.co.za2011-02-16 08:42:11http://www.cs.up.ac.za/courses/COS332The course material, including the 'textbook' is available at http://netw.co.za. The password to access the 'textbook' is 'copyrighted'. Please let me know if you spot any inconsistencies, in accuracies or other problems. Most of the current content of netw.co.za is provided below as the file cos332.zip. Any modifications to netw.co.za will be announced on this (the CS) site, but not necessarily copied to it. The size of the 'textbook' is currently about 500kB. If anyone does not have the bandwidth to download it, please contact the class representative (as soon as one has been elected) to request a copy. Note that some of the content of the 'textbook' will change during the course of the semester. Chapter 4 is scheduled to be changed and some missing pieces will be added. Changes will be announced on this (the CS) site.2011-02-16 08:40:31http://www.cs.up.ac.za/modules/courses/download.php?id=57Study guide2011-02-16 08:30:07http://www.cs.up.ac.za/courses/COS332The correct answer for Q6(3) is G.2010-05-29 11:07:47http://www.cs.up.ac.za/modules/courses/download.php?id=25953Memorandum2010-05-28 12:06:45http://www.cs.up.ac.za/courses/COS332The semester marks have been published below. If there are any inaccuracies, remember the famous phrase on the cover of the Hitchhiker\'s Guide to the Galaxy and act accordingly. We can rectify inaccuracies (if there are any) in V0.1.2010-05-20 14:24:37http://www.cs.up.ac.za/modules/courses/download.php?id=25933Semester marks (Version 0)2010-05-20 14:16:32http://www.cs.up.ac.za/courses/COS332Chapter 9 of the study material has been released on netw.co.za. A complete version that does not add any new material, but integrates all earlier material and corrects some typos and similar issues, has also been released. Thanks to all who helped to spot problems. Further help to spot remaining issues will be appreciated.2010-05-14 11:21:15http://www.cs.up.ac.za/courses/COS332A couple of you have noticed the silly mistake in Section 8.4.3 (CRCs) of the handbook: 1-0=0... An updated version of that section is now available on netw.co.za.2010-05-14 07:39:04http://www.cs.up.ac.za/courses/COS332Chapter 8 (on layer 2) is available. Please read it. Ensure that you know exactly how Hamming code works by next Tuesday (11 May).2010-05-03 21:48:53http://www.cs.up.ac.za/courses/COS332The semester test is available at the cosidesk from today onwards. On Wednesday, 5 May 2010, all mark queries will be dealt with in the ICSA lab between 1pm till 2:30pm. Use this slot for any queries on pracs, class tests and semester test. Take note that all the small class tests and big class tests will be available for collection in the query session.2010-04-30 11:53:35http://www.cs.up.ac.za/courses/COS332The marks have now been released. These marks are up to date up to 23 April. If you have any queries on the marks, there will be a 2 hour slot next week in which you can query the marks. The time for this slot will be made public very soon. Queries will only be dealt with in that session, so please keep all your queries until that time.2010-04-23 12:15:44http://www.cs.up.ac.za/courses/COS332The marks have now been released. These marks are up to date up to 23 April. If you have any queries on the marks, there will be a 2 hour slot next week in which you can query the marks. The time for this slot will be made public very soon. Queries will only be dealt with in that session, so please keep all your queries until that time.2010-04-23 11:53:22http://www.cs.up.ac.za/courses/COS332Practical 9 Upload slot2010-04-22 12:01:04http://www.cs.up.ac.za/courses/COS332I will not be available for consultation during my normal consultation hours on Wednesday, 28 March, since that Wednesday is officially a Monday. I will also not be available for consultation during my normal consultation hours on Wednesday, 5 May, but will be in my office for most of Thursday, 6 May. You are welcome to come and talk to me then.2010-04-20 11:42:43http://www.cs.up.ac.za/modules/courses/download.php?id=25713Semester test memorandum2010-04-16 13:42:59http://www.cs.up.ac.za/courses/COS332Some new prescribed material (Chapters 4-7) has been posted. Given the little time that remains before the semester test, only that work in the new material that has been discussed in class (plus all the old material and pracs) will be examined in the semester test. Ignore Chapter 4 for the time being. We will discuss the overlap between class work and Chapters 5-7 during Tuesday\'s lecture. For the sake of clarity: The semester test will cover all work discussed thus far in class, as well as anything you had to do thus far for a prac. In addition, Chapters 1-3 will be covered in the test, including any material it contains not discussed in class. Chapters 5-7 may help you to understand something better that was discussed in class, but no new work in those chapters will be tested.2010-04-11 23:32:55http://www.cs.up.ac.za/courses/COS332An important new RFC has just been published: RFC 5841. Please study it before the next lecture.2010-04-02 14:15:05http://www.cs.up.ac.za/courses/COS332Here is the memo for yesterday\'s big class test - somewhat later than I anticipated. It is represented using row-major order. AEBCA CAADD ABCED2010-03-31 10:02:21http://www.cs.up.ac.za/courses/COS332Practical 8 Upload slot2010-03-25 12:00:30http://www.cs.up.ac.za/courses/COS332I today received a spam message that the headers claim originated from 121.11.149.250. If the headers are correct, where in the world did the message originate from? The headers claim that 121.11.149.250 is associated with up.ac.mz. Does this domain exist? To whom is it registered? Does it correspond with 121.11.149.250 in any way? Why would someone use an address like up.ac.mz to spam me? Some other interesting remarks: The message was sent by \"Global SpringerLink Finance Investments\". (Why is this interesting?) The message was sent using a time of GMT+2. (Why is this interesting?) The path the message seems to have followed is 121.11.149.250 to 127.0.0.1 to 127.0.0.1 to 196.3.96.162 to 137.215.101.101 to 137.215.40.17. Does this make sense? Can we catch the guilty party? Let\'s discuss this in class on Friday.2010-03-24 11:58:08http://www.cs.up.ac.za/courses/COS332I today received a spam message that the headers claim originated from 121.11.149.250. If the headers are correct, where in the world did the message originate from? The headers claim that 121.11.149.250 is associated with up.ac.mz. Does this domain exist? To whom is it registered? Does it correspond with 121.11.149.250 in any way? Why would someone use an address like up.ac.mz to spam me? Some other interesting remarks: The message is sent by \"Global SpringerLink Finance Investments\". (Why is this interesting?) The message was sent using a time of GMT+2. (Why is this interesting?) The path the message seems to have followed is 121.11.149.250 to 127.0.0.1 to 127.0.0.1 to 196.3.96.162 to 137.215.101.101 to 137.215.40.17. Does this make sense? Let\'s discuss this in class on Friday.2010-03-24 11:55:25http://www.cs.up.ac.za/courses/COS332I today received a spam message that the headers claim originated from 121.11.149.250. If the headers are correct, where in the world did the message originate from? The headers claim that 121.11.149.250 is associated with up.ac.mz. Does this domain exist? To whom is it registered? Does it correspond with 121.11.149.250 in nay way? Why would someone use an address like up.ac.mz to spam me? Some other interesting remarks: The message is sent by \"Global SpringerLink Finance Investments\". (Why is this interesting?) The message was sent using a time of GMT+2. (Why is this interesting?) The path the message seems to have followed is 121.11.149.250 to 127.0.0.1 to 127.0.0.1 to 196.3.96.162 to 137.215.101.101 to 137.215.40.17. Does this make sense? Let\'s discuss this in class on Friday.2010-03-24 11:53:48http://www.cs.up.ac.za/courses/COS332There are quite a few public SMTP servers you can use. If you are still struggling to use the smtp servers which are offered by campus you can try the following ones: smtp.saix.net smtp.telkomsa.net smtp.is.co.za If these ones still fail, use the one which is provided by your ISP. If after all these suggestions you still struggle. Register either a yahoo, hotmail or gmail account and use their smtp server. There is really many various options that you can use. Lastly, do note that you are obviously not allowed to use \"import javax.mail\" at all as this implements the protocol for you. Any program which uses javax.mail will receive 0. 2010-03-18 14:22:06http://www.cs.up.ac.za/courses/COS332The PGP server for Practical 5 is up an running. Use all the details as specified in the practical but a different public key should be used. The practical should be completed within 7 days from this announcement. Thus the cut-off date for this practical is now Thursday the 25th. The public key is as follows: -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.10 (GNU/Linux) mQGiBEfWG0MRBADN2o5ylbzIhj7b4HnfZE1aHiBaYLJUFopliV4jRf6uDBFEh3qi j4yQf986NPQCFTXVdlXIk/n2en1u8MbfnjaWtuGuV9AKGpwem2akVEfBc5WKhLO4 U9vHmulJi/QwOFR7O3hOsuqGsQwvDn2LjgGLLA8zbv8H4wI29QHj6wUrMQCg/zyX ZFKuUtNvSrdcsvKkTZy1O9sD/1mJ/Cyn4OzLBm5PEi67vWCuzQY9YGOeRQh313wY ZGu9bTeotgdAJlGg2DS0FOk8SbzraV4hFsOq6FHWq0t4uF4pV1cOGq3hn398+wkg 51BTVIBvD3COUNkhSi2k3xYfdmJPe4uZpITRM6VAI8AODHOighVgfouyIIl5HmZP wZNkA/40+2nmjOW8Pk1klzbYBIvCvs4zA9f6ydradkohO7sdaXQZlBARoxwbxHGf bieM4XjzDfy8Ww/zdp4PMPOFjGcZUV361MdM9TqbQdsZrICc4IsjK08oVUdg5JDy p1IRSDQjG+rUGMtK5A5iHy99vQX58ZZnjmOfzo8G6sPkHvyztrQlY29zMzMycHJh YzUgPGNvczMzMnByYWM1QGNzLnVwLmFjLnphPohYBBARAgAYBQJH1htDCAsJCAcD AgEKAhkBBRsDAAAAAAoJEOfL7AhhGPRGjZEAoKPpY3usJud4qQsxqCzd1EzEj4V0 AJ9Qw+tmljHQwX3OHjR1Qn/v5OebHbkCDQRH1htDEAgA9kJXtwh/CBdyorrWqULz Bej5UxE5T7bxbrlLOCDaAadWoxTpj0BV89AHxstDqZSt90xkhkn4DIO9ZekX1KHT UPj1WV/cdlJPPT2N286Z4VeSWc39uK50T8X8dryDxUcwYc58yWb/Ffm7/ZFexwGq 01uejaClcjrUGvC/RgBYK+X0iP1YTknbzSC0neSRBzZrM2w4DUUdD3yIsxx8Wy2O 9vPJI8BD8KVbGI2Ou1WMuF040zT9fBdXQ6MdGGzeMyEstSr/POGxKUAYEY18hKcK ctaGxAMZyAcpesqVDNmWn6vQClCbAkbTCD1mpF1Bn5x8vYlLIhkmuquiXsNV6TIL OwACAggAoQjUxY/YtwEbD14pY9H4Ubm2UCNKISOggmLp2H5hSPYQZ55eJKYWc4SB Z/VPy2CE89zxOogd2nc5uPT+yo7dS9bCypLifkoEqNYGNPWVCGImatpLKzjgdq0/ uSe1Gy4kpaCsxKzybaHlLGhLKB1w8W/agYmapmwDgp2dTGZvXfbgxFWzS4lphZ5Z pOBlR126LkgThr4gJGr17ix2aUxMueuSY0GVyBnzIw2IN3b4rqfHwatpQQa7GKqC TGBhcg68N3ZcuyrJP5X3wnFsetyr3KE3FPHRHnzGSeTV+aGsjZDmy8lIkOOjGhnV Sv4Q3fjQZ2gAIv7qdsXHFMUSvnT6AIhMBBgRAgAMBQJH1htDBRsMAAAAAAoJEOfL 7AhhGPRGSYcAoIMrXkQz0U6lft+8vPJD24cOfVw/AKDpvWWbMSJ7HNZCnV/W+dns 9jCPpg== =tPVN -----END PGP PUBLIC KEY BLOCK----- 2010-03-18 14:18:17http://www.cs.up.ac.za/courses/COS332Practical 7 Upload slot2010-03-18 12:00:53http://www.cs.up.ac.za/courses/COS332I have opened Assignments 1 and 2 again - if you have not yet uploaded either (or both) of them you have until Friday to do so. After that no single excuse (or any emailed assignment at any time prior or subsequent to the deadline) will be accepted. Note that I will not be on campus on Wednesday and Thursday; this, in particular, will not be an excuse for missing the deadline again.2010-03-16 16:01:04http://www.cs.up.ac.za/courses/COS332The semester test is to be written one month from today: Friday, 16 April. Normal lecture period. Normal lecture venue.2010-03-16 15:56:56http://www.cs.up.ac.za/courses/COS332Try using student.up.ac.za for Prac 6 from campus (and your ISP\'s server from home). Student works from my office, but I don\'t have the rights to test it from the lab...2010-03-16 15:51:52http://www.cs.up.ac.za/courses/COS332Prac 5 is on ice until the server works. You will get at least a week\'s notice before Prac 5 will really be due. In the meantime we continue with Prac 6 as scheduled.2010-03-16 15:50:19http://www.cs.up.ac.za/courses/COS332Practical 6 Upload slot2010-03-11 12:00:14http://www.cs.up.ac.za/courses/COS332See ftp://ftp.cs.up.ac.za/Software/Networks/GNUPG/PGPDesktop9.10.0_Windows.zip or, for the sake of brevity, http://tinyurl.com/pgpprac2010-03-10 12:08:40http://www.cs.up.ac.za/courses/COS332The Prac 5 server is not running as it should. When it does run you will receive a reply - positive or negative. If you get no response your email has simply been queued until it runs again. We will extend the due date for this prac by about a week to address the issue. In the meantime, make sure that you can communicate with friends using PGP/GPG. 2010-03-10 11:31:37http://www.cs.up.ac.za/courses/COS332I recently registered example.za.org, but it\'s not working. The problem occurs somewhere in the DNS. I think I know where the problem is, but to allow you to test your diagnostic skills I plan to leave it broken for a few days. Is anyone able to pinpoint the wrong entry/entries in the DNS? BTW I am not referring to example.org.za, which works fine.2010-03-10 08:11:48http://www.cs.up.ac.za/courses/COS332I recently registered example.za.org, but it\'s not working. The problem occurs somewhere in the DNS. I think I know where the problem is, but to allow you to test your diagnosis skills I plan to leave it broken for a few days. Is anyone able to pinpoint the wrong entry/entries in the DNS? BTW I am not referring to example.org.za, which works fine.2010-03-10 07:33:47http://www.cs.up.ac.za/courses/COS332Read the following News24 story on domain squatting in za: http://tinyurl.com/zadna2010-03-10 07:29:36http://www.cs.up.ac.za/courses/COS332According to dnjournal.com: \"Sedo\'s roster included four ccTLDs that broke through the strong .com defensive line to take places on the elite [price] list. Two of those country codes landed in the top ten; #4 Furniture.co.za (South African ccTLD) at $33,000 and #8 MO.de (German ccTLD) at $21,039.\" [Thanks to Philippo for pointing this out] 2010-03-05 14:02:08http://www.cs.up.ac.za/courses/COS332Because of other duties I will not be available during my consultation hours slot on Wednesday, 17 March. I will be in my office on Tuesday, 16 March.2010-03-05 11:18:15http://www.cs.up.ac.za/courses/COS332Chapters 2 and 3 of the prescribed material are now available on netw.co.za. Again, please point out any typographical or other errors to me. I really appreciate any such feedback. For the class test on Tuesday ensure that you are ready to be tested about the work done during this week\'s lectures, as well as pages 1-47 in the notes.2010-03-05 10:34:33http://www.cs.up.ac.za/modules/courses/download.php?id=25400Marksheet first draft2010-03-05 09:32:10http://www.cs.up.ac.za/courses/COS332If you had a clash for the previous practical and the cos 212 semester test, you are required to email me directly and also be present at this weeks practical session. Your practical will be marked in this comming practical session. It will only be marked AFTER all the students practical 4 have been marked so be prepared to wait awhile for this.2010-03-05 09:29:17http://www.cs.up.ac.za/courses/COS332The first draft of the marksheet has been published now. It is your job to make sure that you are included on the list and that your marks are correct and up to date. SCT 3 - 5 will be added as soon as the marksheet has been finalised. To find your mark you are required to take your student number and mod ( % ) it with 9999. For example if your student number is 27123682 then your mod would be 6394. If it is the case that your marks are missing or is wrong you are required to let me know before the next practical marking session. Also if you are not on the classlist it is important that you email me about it as soon as possible.2010-03-05 09:27:05http://www.cs.up.ac.za/courses/COS332Practical 1 Upload slot2010-02-05 08:45:48http://www.cs.up.ac.za/courses/COS332The course information has been published on http://netw.co.za; it is also available as a tiny zip file, cos332.zip, in the study guide section below.2010-02-02 11:31:32http://www.cs.up.ac.za/modules/courses/download.php?id=25065Contents of netw.co.za2010-02-02 11:30:37http://www.cs.up.ac.za/modules/courses/download.php?id=25050Study Guide2010-02-01 13:50:01http://www.cs.up.ac.za/modules/courses/download.php?id=25044Study guide2010-02-01 11:10:51http://www.cs.up.ac.za/courses/COS332The study guide has been posted in the files section below.2010-02-01 11:04:06http://www.cs.up.ac.za/modules/courses/download.php?id=241642009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24163Prac 92009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24162Prac 82009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24161Prac 72009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24160Prac 62009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24159Prac 52009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24158Prac 42009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24157Prac 32009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24156Prac 22009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24155Prac 12009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24154List of practicals2009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=237042009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24858Semester marks (Version 1)2009-11-10 13:24:08http://www.cs.up.ac.za/modules/courses/download.php?id=24052Marks on 30-09-20092009-11-10 13:24:08http://www.cs.up.ac.za/courses/COS332 This feed will provide you updates regarding Anouncements, Assignments, Bookings and Files for COS33210 Nov 2009, 13:24