📄 http:^^www.cs.washington.edu^education^courses^461^sp96^cse461-bboard.shtml
字号:
Date: Wed, 08 Jan 1997 20:57:32 GMTServer: NCSA/1.4.2Content-type: text/html<html> <head><title>CSE/EE 461 Bboard/Mail Log</title></head><body><h1>CSE/EE 461 Computer Networks<br> Bboard/Mail Log<br> Spring 1996</h1>This page contains a log of all email sent to the CSE/EE 461 classmailing list <a href="mailto:cse461@cs.washington.edu"><tt>cse461@cs</tt></a>. We will use this list forannouncements of general interest to the class. Students shouldalso feel free to use it to ask questions, post information, orinitiate discussions of general interest to the class. Of course,questions or comments that don't seem of general interest can bedirected to the TA (<a href="mailto:wchan@cs.washington.edu"><tt>wchan@cs</tt></a>) or instructor(<a href="mailto:ladner@cs.washington.edu"><tt>ladner@cs</tt></a>), instead. <p> Following usual Internet conventions, administrative requestsconcerning the mailing list itself, such as add/delete/addresschange requests, should be addressed to <a href="mailto:cse461-request@cs.washington.edu"><tt>cse461-request@cs</tt></a>.<h2>Index of Messages</h2>(Latest message Friday, 07-Jun-96 12:11:06 PDT.)<p><ul><li><a href=#827955547001><tt>27 Mar 96 wchan@lupine __ CSE/EE 461</tt></a><li><a href=#828061382001><tt>28 Mar 96 ladner@cs _____ Problem 1 part (b), Homework 1.</tt></a><li><a href=#828061640001><tt>28 Mar 96 ladner@cs _____ Text Books</tt></a><li><a href=#828383729001><tt> 1 Apr 96 wchan@lupine __ 461 TA office hours</tt></a><li><a href=#828553876001><tt> 3 Apr 96 ladner@cs _____ Keys and Accounts</tt></a><li><a href=#828559522001><tt> 3 Apr 96 ladner@cs _____ Text Book</tt></a><li><a href=#828721007001><tt> 5 Apr 96 ladner@cs _____ Internet Phone</tt></a><li><a href=#828913956001><tt> 7 Apr 96 ladner@cs _____ What to read in Chapter 2</tt></a><li><a href=#829072590001><tt> 9 Apr 96 ladner@cs _____ Homework 3</tt></a><li><a href=#829073342001><tt> 9 Apr 96 ladner@cs _____ Homework 3.</tt></a><li><a href=#829641093001><tt>16 Apr 96 wchan@lupine __ if you're uncomfortable with C</tt></a><li><a href=#829758950001><tt>17 Apr 96 ladner@cs _____ Lecture clarification</tt></a><li><a href=#829949965001><tt>19 Apr 96 wchan@lupine __ project 1</tt></a><li><a href=#830192071001><tt>22 Apr 96 ladner@cs _____ Midterm Exam</tt></a><li><a href=#830192927001><tt>22 Apr 96 ladner@cs _____ Question and Answer on Wednesday</tt></a><li><a href=#830217589001><tt>22 Apr 96 ladner@cs _____ Question and Answer Session</tt></a><li><a href=#830304832001><tt>23 Apr 96 wchan@cs ______ Re: Project question</tt></a><li><a href=#830363837001><tt>24 Apr 96 ladner@cs _____ Last years midterm</tt></a><li><a href=#830974038001><tt> 1 May 96 ladner@cs _____ Midterm</tt></a><li><a href=#831141718001><tt> 3 May 96 ladner@cs _____ Warning</tt></a><li><a href=#831148662001><tt> 3 May 96 ladner@cs _____ Bad Calculation</tt></a><li><a href=#831335453001><tt> 5 May 96 wchan@calvin __ project stuff</tt></a><li><a href=#831482675001><tt> 7 May 96 barak@cs ______ Sim and Linux</tt></a><li><a href=#831510895001><tt> 7 May 96 ladner@cs _____ What to read in Chapters 4 and 5</tt></a><li><a href=#831630498001><tt> 9 May 96 wchan@calvin __ part 1 solution</tt></a><li><a href=#831686249001><tt> 9 May 96 wchan@cs ______ ack timer in protocol 8</tt></a><li><a href=#832006302001><tt>13 May 96 ladner@cs _____ Queuing Theory</tt></a><li><a href=#832025025001><tt>13 May 96 wchan@lupine __ project 1</tt></a><li><a href=#832231750001><tt>16 May 96 wchan@lupine __ project 3 ready</tt></a><li><a href=#832282209001><tt>16 May 96 wchan@cs ______ IRC</tt></a><li><a href=#832630531001><tt>20 May 96 ladner@cs _____ May</tt></a><li><a href=#832821583001><tt>22 May 96 dgodon@u ______ reading</tt></a><li><a href=#833240877001><tt>27 May 96 wchan@cs ______ project 2 graded</tt></a><li><a href=#833382017001><tt>29 May 96 ladner@cs _____ Office Hours</tt></a><li><a href=#833416024001><tt>29 May 96 ladner@cs _____ What to read for the Final</tt></a><li><a href=#833560786001><tt>31 May 96 ladner@cs _____ Final Exam</tt></a><li><a href=#833715502001><tt> 2 Jun 96 wchan@calvin __ 461</tt></a></ul><pre></pre><hr><h2>Messages</h2><pre><hr size=4><a name="827955547001">Date: Wed, 27 Mar 1996 11:38:52 -0800From: <b>wchan@lupine</b>To: cse461@csSubject: <b>CSE/EE 461</b></a>This is a test for the CSE/EE 461 mailing list.Let me know if you're not taking the class.The web page has been set up. The URL is: http://www.cs.washington.edu/education/courses/461/Homework 1 is there if you didn't get a copy this morning.-- william<hr size=4><a name="828061382001">To: cse461@csSubject: <b>Problem 1 part (b), Homework 1.</b>Date: Thu, 28 Mar 1996 17:02:54 PSTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>For part (b) you can assume that a 747 is takes offevery 12 hours delivering tapes. I sort of madethat assumption but was not explicit enough.Richard<hr size=4><a name="828061640001">To: cse461@csSubject: <b>Text Books</b>Date: Thu, 28 Mar 1996 17:07:10 PSTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>I have heard that the bookstore is out of books. Ihave been told that new books will arrive early nextweek. I ordered enough for those actually registered forthe class. Clearly, some books were bought by folksnot in the class.I don't have any extra copies, so for the time beingI hope that some of you will be willing to share withyour fellow students.Richard Ladner<hr size=4><a name="828383729001">Date: Mon, 1 Apr 1996 10:35:20 -0800From: <b>wchan@lupine</b>To: cse461@csSubject: <b>461 TA office hours</b></a>I'll have an office hour every Tuesday (starting tomorrow)11:30 to 12:20 in Sieg 225. And I'll make my Thursday officehour (2:30 - 3:20, Sieg 326) permanent.-- william<hr size=4><a name="828553876001">To: cse461@csSubject: <b>Keys and Accounts</b>Date: Wed, 03 Apr 1996 09:51:03 PSTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>To pick up your key and account go to the main CSEoffice in Sieg 114 and state your request. Be sureto mention you are in my class.<hr size=4><a name="828559522001">To: cse461@csSubject: <b>Text Book</b>Date: Wed, 03 Apr 1996 11:25:01 PSTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>I have been informed that the book has arrivedat the bookstore.Richard<hr size=4><a name="828721007001">To: cse461@csSubject: <b>Internet Phone</b>Date: Fri, 05 Apr 1996 08:16:40 PSTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>Student Sean Vaughan has discovered that a particularflavor of the internet phone uses both TCP and UDP.Please read below.Richard -------------------------------From Sean Vaughan:In some of the the documentation that I was reading through on the"internet phone" (http://www.vocaltec.com) I found the following: ... the two channels it works with: 1. TCP Port 6667 (decimal) to remote system: The port used to connect toIRC (note that some IRC servers use different port assignments, such as6665 or 6666, but none of them appear on the default list of IRC serversin the Internet Phone. You need to open these ports only if you areactually using servers on them). 2. UDP port 22555 (decimal). All audio is passed through this port on bothlocal and remote machine. EOMBasically TCP port 6667 is used for setting up the call while UDP port 22555 is used for the audio transmission.<hr size=4><a name="828913956001">To: cse461@csSubject: <b>What to read in Chapter 2</b>Date: Sun, 07 Apr 1996 14:52:19 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>I certainly recommend that you read the entire chapter, butbe sure to read.2.1.32.3.12.4.42.4.52.6.12.8.32.9<hr size=4><a name="829072590001">To: cse461@csSubject: <b>Homework 3</b>Date: Tue, 09 Apr 1996 10:56:19 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>In problem 2 the transmission bandwidth in partb should be .5 Gbps not GHz.In problem 3, explain what the computer must doto avoid transmitting to quickly to the network.<hr size=4><a name="829073342001">To: cse461@csSubject: <b>Homework 3.</b>Date: Tue, 09 Apr 1996 11:08:47 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>In problem 1 change 4 dB to 40 dB. My error.Richard<hr size=4><a name="829641093001">Date: Tue, 16 Apr 1996 00:51:27 -0700From: <b>wchan@lupine</b>To: cse461@csSubject: <b>if you're uncomfortable with C</b></a>We are going to hand out the first project on Wednesday. You'll beasked to modify some of the data link protocols in the book. If youfeel uncomfortable with C, you can come to my office hour today(11:30am Sieg 225) and we can go through the protocols in the book.-- william<hr size=4><a name="829758950001">To: cse461@csSubject: <b>Lecture clarification</b>Date: Wed, 17 Apr 1996 09:35:37 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>For all the sliding window policies the receivermust send a request with sequence no i whenever itreceives a frame and i the number of the firstempty slot in its window after the frame arrives.In this way the sender will eventually be notifiedto send this frame again.Thus line on transparency 9 is really correctexcept it should read -If window is at i and a frame j arriveswith j different from i then ignor the frame, butsend ack (request) with seq_no i.My apologies for the confusion in class. Richard<hr size=4><a name="829949965001">Date: Fri, 19 Apr 1996 14:39:16 -0700From: <b>wchan@lupine</b>To: cse461@csSubject: <b>project 1</b></a>1 There are two fields for sequence numbers in the frame struct, namely seq and ack. seq is for the sequence number of the data, while ack is for the sequence number of the ack. The receiver should not put sequence number in the seq field; it would be wiped out by the simulator. Use the ack field instead.2 If you use printf() to print debug information in sender() or receiver(), the output might be mixed up and hard to read. To partially fix this, copy the new protocol.h to your directory, and instead of printf("mumble"), use fprintf(tty[id],"mumble").3 Because of the size of the class, I won't have time to read your code in any detail. So I'll mostly grade your code based on correctness. If your program doesn't work, make sure you explain what the problem is, and what you think might cause the problem, etc, so that I can give you partial credit.-- william<hr size=4><a name="830192071001">To: cse461@csSubject: <b>Midterm Exam</b>Date: Mon, 22 Apr 1996 09:54:09 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>The midterm is Friday, April 26.Bring one 8 1/2 X 11 inch blue book.You may use the first four pages for your personalhandwritten notes. Use the notes to help youorganize the material. The exam will not be a testof memory, but a test of your thinking ability andyour ability to solve problems.What you should read and understand.Chapter 1Sections1.11.21.31.4Chapter 2Sections2.1.32.3.12.4.42.4.52.6.12.8.32.9Chapter 3Sections3.13.23.33.43.5.13.6<hr size=4><a name="830192927001">To: cse461@csSubject: <b>Question and Answer on Wednesday</b>Date: Mon, 22 Apr 1996 10:08:30 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>After finishing Chapter 3 in the lecture Wednesday,there will be a question and answer session.Please be prepared with your questions and I canhopefully help with answers.As encouragement for you to ask questions, it isoften the case that students think their questionsare too simple or stupid. This is almost never thecase. If you don't understand something, evensomething very basic, you can bet other studentsdon't either. Your questions are most oftenappreciated by other students.Please come in with your questions on Wednesday.Richard<hr size=4><a name="830217589001">To: cse461@csSubject: <b>Question and Answer Session</b>Date: Mon, 22 Apr 1996 16:59:39 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>Several students have e-mailed me questions forWednesday's session. This is wonderful. It givesme a chance to think about the questions so I canmake thoughtful answers.If you have any questions you can tell me ahead oftime just e-mail and I can hopefully answer onWednesday.Here are the questions so far:1. What, exactly, *is* bandwidth?I thought bandwidth was the range of frequencies (in Hz) that a given filter would pass. In this case, a communication channel wire, or fiber, or radio, etc.However, in the homeowrks, bandwidth is used to refer to data rate, and is given in bps.I've seen this problem from outside sources before, as well, so is "bandwidth" just a well-defined, but sometimes sloppily applied term?2. I have some doubts, reg PAR and ABP.You said we can fix PAR by putting seq_no intoacks, isn't that what the ABP does, or is thereany other difference ?3. What is the difference between ABP andprotocol no. 4?All good questions, let's have more.Richard<hr size=4><a name="830304832001">Date: Tue, 23 Apr 1996 17:13:40 -0700From: <b>wchan (William Chan)</b>To: cse461@csSubject: <b>Re: Project question</b></a>>On problem 4 you ask what could go wrong if (1) the data frames do not carry>sequence numbers and (2) if the request frames do not carry sequence numbers.>Are you asking what would happen if the data frames do not carry sequence >numbers and the request frames do carry sequence numbers? And then separately>if the request frames do not carry sequence numbers and the data frames do? Yes.-- william<hr size=4><a name="830363837001">To: cse461@csSubject: <b>Last years midterm</b>Date: Wed, 24 Apr 1996 09:37:10 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>I put extra copies of the midterm in the bottom slotof my hanger outside my door, 311 Sieg.I don't have a solution set for the midterm but Iwould be happy to explain any solutions duringmy office hour today or tomorrow from 11-12.Richard<hr size=4><a name="830974038001">To: cse461@csSubject: <b>Midterm</b>Date: Wed, 01 May 1996 11:07:04 PDTFrom: <b>Richard Ladner <ladner@whalespout.cs.washington.edu></b></a>As I mentioned in class today on the solution to problem 2a on the midterm I transposed selectiverepeat and go-back-N. Also, the mean on the midterm was 64 with a highof 90 and a low near 30.As you can see from the midterm, I am emphasizingproblem solving over memory work. In preparation forthe final I will pass out my old final so that youcan prepare by solving those old problems.To study for the final you will want to practice thekind of work that will be expected on it.⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -