CNT 4713

General

• Syllabus
  • Section 01A
  • Section 02A
• Exam Information will be posted here prior to exams.
  • Check the Moodle calendar for exam dates.
  • Quiz 2 will be on Friday, May 12. It will cover python and questions from the end of chapter 1.
    • Topics from Week 1.
    • Python: expressions, lists, tuples, dictionaries, if statements, while loops, for loops, method declaration, import statements.
  • Quiz 3 will be on Wednesday, May 17. It will cover definitions from the topics for Week 2.
  • Quiz 4 will be on Friday, May 19. It will cover coding, problems and definitions from the topics for Week 2.
  • Quiz 5 will be on Wednesday, May 24. It will cover definitions from the topics for Week 3.
  • Quiz 6 will be on Friday, May 26. It will cover coding, problems and definitions from the topics for Week 3.
  • Quiz 7 will be on Wednesday, May 31. It will cover definitions from the topics for Week 4.
  • Quiz 8 will be on Friday, June 2. It will cover coding, problems and definitions from the topics for Week 4.
  • Quiz 9 will be on Wednesday, June 7. It will cover definitions from the topics for Week 5.
  • Quiz 10 will be on Friday, June 9. It will cover coding, problems and definitions from the topics for Week 5.
  • Quiz 11 will be on Wednesday, June 14. It will cover definitions from the topics for Week 6.
  • Quiz 12 will be on Friday, June 16. It will cover coding, problems and definitions from the topics for Week 6.
  • Quiz 13 will be on Wednesday, June 16. It will cover definitions from the topics for Weeks 1-5.
  • Quiz 14 will be on Friday, June 16. It will cover coding, problems and definitions from the topics for Weeks 1-5.
  • Exam 1 will be on Wednesday, September 28. It will cover chapters 1 and 2, along with CGI programming and web basics.
    • All topics and links on this page that look like this
    • All topics from Chapter 1 of the book
    • All topics from Chapter 2 of the book
    • All topics from the first 15 pages of the web basics reference
    • All topics from Homework 1
    • All topics from Quiz 1
    • Additional Chapter 2 Review Questions: R21 - R27, except R25.
    • Additional Chapter 2 Problems: P22 - P25, P27, P28, P31, P32, P35
    • Additional Python: UDP Client and Server, TCP Client and server. Applications that use TCP or UDP: Web server, UDP pinger, Web proxy, SMTP client.
  • Quiz 2 will be on Wednesday, 10/26. It will cover questions from the ends of chapters 3 and 9, which are listed in Homework 2.
    • Chapter 3 Review Questions: except R5 and R19.
    • Chapter 3 Problems: P1-P5, P8-P12, P14, P22-P27, P29, P31, P34-P37, P40, P43, P44, P46, P55
      • More information about cwnd.
      • Clarification about P43. P43 states that the Host A is capable of sending data into the TCP socket at a rate of S bps, where S = 10 * R. R is the transmission rate of the link. The book aslo mentions that Host A has a buffer. A better description is that Host A is capable of sending data into the buffer at a rate of S bps and the buffer can send data into the link at R bps.
  • Quiz 3 will be on Wednesday, Nov 30. It will cover questions from the ends of chapters 4, 5 and 8, which are listed in Homework 3.
    • Chapter 4 Review Questions: Several of the questions refer to virtual circuits; we did not cover them. You may omit the parts of any questions that refer to virtual circuits (VC). R1, R3, R8-R12, R15-R19, R21-23, R32, R33.
    • Chapter 4 Problems: P7, P9, P24-P28, P30-P32, P34, P42-P44, P46-P48
    • Chapter 5 Review Questions: R1-R3, R5-R12.
    • Chapter 5 Problems: P1-P6 P7, P11, P14-P17 -P19, P21, P22, P26, P31
    • Chapter 8: R1, R3, R5-R10, R13, R15, R16, R19, R20. Correction: R5 should read 8-bit block cipher.
    • Chapter 8 Problems: P1, P3, P5, P8, P12

    • Chapter 4 Sections

      • 4.1
        • 4.1.1
      • 4.3
        • 4.3.1
        • 4.3.2
        • 4.3.3
        • 4.3.4
      • 4.4
        • 4.4.1 - Skip fragmentaion
        • 4.4.2 - Only Network Address Translation (NAT)
        • 4.4.3
        • 4.4.4
      • 4.5
      • 4.6
        • 4.6.1
        • 4.6.2
        • 4.6.3 - Through BGP Basics
        • 4.6.4
      • 4.7
        • 4.7.1

      Chapter 5 Sections

      • 5.1
      • 5.3
      • 5.4
      • 5.7

  • Exam 3 will be during finals week. Check the Moodle calendar and your Panther Soft schedule for the time for your section. It will cover chapters 4, 5, 8, 6, and 7.
    • All topics from Quiz 3
    • Homework 3
    • Extra Credit 5
    • Additional Review Problems Since Quiz 3.
      1. Chapter 6: R3, R4, R6, R7, R11 (spoofed destination MAC address).
      2. Chapter 7: R1-R4, R6, R8, R9, R12-R14.
    • Additional Problems Since Quiz 3.
      1. Chapter 6: P1-P4.
    • List of notes from the in-class lectures:
      • Section 01: ch4_4-1_4-4_01, ch4_intro_01, ch4_4-5_01, ch4_4-7_01, ch5_5-1_01, ch5_intro_01, ch4_4-5_01_dup, ch5_5-2_01, ch4_4-6_01, ch5_5-3_01, ch5_5-4_01, ch8-01, ch8_intro_01, ch8_ssl_01, ch6_01, quiz3_review_01
      • Section 02: ch4_4-1_4-4_02, ch4_intro, ch4_4-5_02, ch4_4-7_02, ch5_5-1_02, ch5_intro_02, ch4_4-5_02_dup, ch5_5-2_02, ch5_5-3_02_real, ch4_4-6_02, ch5_5-4_02, ch5_5-4_02_redo, ch6_intro_02, ch8_intro_02, ch8_02, ch8_ssl_02, ch6_02, quiz3_review_02,
    • List of notes from the video lectures: ch7-7_1-7_3.
• Github Etiquette
  • You may look at the code of other group members.
  • If you use some code that another member wrote, then please add a comment to the code that sites the other member as the author or inspiration of that section of your code.

On-line resources

• Moodle
  • Moodle site, section 01
  • Moodle site, section 02
• Class Notes
  • Information
  • The password for the slides is netcentric.
  • List of lectures for section 01
  • List of lectures for section 02
  • List of video lecture notes for all sections.
  • List of video lecture notes for all sections, from previous semester.
• Textbook Site

  PowerPoint Slides

  The powerpoint slides are very good. You can read them faster than I can read them to you. I expect you to read the power point after you have read a chapter.

  Student Resources

  The student resources are excellent. They include applets, practice exercises, lab outlines. I expect you to take advantage of all of these resources.

• Guide to Web Development with Java. Access the Look Inside feature from the Amazon page for this book. Read pages 1-18, which is all that is available in the Look Inside.
  • Video on HTML basics
  • Video on hypertext links and query string
• Python Resources
  • Python Tutorial at sthurlow.com
  • Python Docs
  • Python Tutorial at Brandeis
• View some of the scripts from class.

Assignments

• Week 1
  • Definitions
    • hosts, internal nodes, access links, internal links, global ISP, regional ISP, home network, enterprise network, TCP, IP, RFC, network protocols, servers, clients, router, switch, modem, base station, distributed application, API, protocol, data center, DSL, cable access, FTTH, Dial-up, geostationary, LEO, UTP, Coaxial, Fiber Optics, Terrestrial radio, Satellite radio, messages, packets, routers, transmission rate, store-and-forward, queuing delay, packet loss, forwarding table, routing table, circuit switching, Tier-1, PoP, IXP, multi-home, peer, FDM, TDM, silent periods, content provider network, transmission delay, propagation delay, average throughput, bottleneck, instantaneous throughput, bandwidth, encapsulation, payload, application-layer message, transport-layer segment, network-layer datagram, link-layer frame
  • Coding.
    • Send me your GitHub username and I will invite you to a repository.
    • Create a branch with your username in the repository.
    • Post examples that you ran to help you learn Python.
    • Create a web presence on ocelot.
  • Problems
    • Chapter 1 Review Questions: R1, R4, R5, R11, R12, R13, R16, R18, R19, R23, R24, R25
    • Chapter 1 Problems: P4, P8, P10, P13, P20, P24, P31.
• Week 2
  • Definitions from 2.1, 2.2, 2.3, 2.4, 2.7
    • application architecture, client-server, data center, P2P, self-scalability, ISP friendly, P2P security, P2P incentives, messages, API, IP address, port number, reliable data transfer, loss-tolerant applications, bandwidth-sensitive apps, elastic applications, TCP connection, UDP, application-layer protocol, HTTP, web page, HTML file, web browser, web server, stateless protocol, non-persistent connection, persistent connection, RTT, request message, request line, header lines, response message, status line, header line, entity body, cookies, set-cookie, web cache, proxy server, conditional GET, if-modified-since, control connection, data connection, out-of-band, in-band, state, USER, PASS, LIST, RETR, STOR, user agents, mail servers, SMTP, mailbox, message queue, SMTP handshake, HELO, MAIL FROM, RCPT TO, DATA, QUIT, mail message formats, From, To, Subject, POP3, user, pass, list, retr, dele, quit, IMAP, port number, socket, UDP, socket(), sendto(), recvfrom(), close(), bind(), TCP, connect(), send(), recv(), listen(), accept()
  • Coding.
    • Continue to post examples from class in GitHub.
    • Assignment 1 from Chapter 2.
      • Start with the TCP Server code from class. You may want to implement the TCP Client to test that the server works. A web server will process HTTP messages.
      • To avoid conflict, request a port for your server from my port site: Request Port
      • After your server is running, add a link from your index page to a file that your server can handle. Replace your port number and filename in this link:
        <a href="http://ocelot.aul.fiu.edu:9999/filename.ext">Existent File</a>
      • Next, add a link from index page to a file that your server does not handle, to see your 404 error page. Replace your port number and non-existent filename in this link:
        <a href="http://ocelot.aul.fiu.edu:9999/nofilename.ext">Non-Existent File</a>
    • Assignment 2 from Chapter 2.
      • Start with the UDP Server and UDP Client code from class.
      • Allow the client to give up if no response has been reveived within 1 second.
      • Include information about how long each response took. This will be the RTT.
  • Labs
    • Wireshark Lab: HTTP
  • Problems
    • Chapter 2 Review Questions: R1 through R16
    • Chapter 2 Problems: P1, P4, P5, P10, P11, P14, P15, P17.
• Week 3
  • Definitions from 2.5, 2.6, 3.1, 3.2, 3.3, 3.4
    • hostname, IP address, domain name system, DNS, host aliasing, mail server aliasing, load distribution, single point of failure, traffic volume, distant centralized database, maintanence, distributed, heirarchical database, root DNS server, TLD servers, authoritative servers, local DNS server, recursive queries, iterative queries, DNS caching, RR, name, value , type, TTL, type: A, NS, CNAME, MX, DNS message format, header section, question section, answer section, authority section, additional section, nslookup, scalability, distribution time, BitTorrent, unchoked, optimistically unchoked, DHT, circular DHT, peer churn, logical communication to process, logical communication to host, segments, network layer - IP, best-effort-delivery service, unreliable service, UDP, TCP, multiplexing and demultiplexing, congestion control, sockets, demultiplexing, multiplexing, source port, destination port, well-known port number, UDP, connectionless multiplexing, connectionless demultiplexing, assigned port, bind to a port, return address, TCP, connection-oriented multiplex, connection-oriented demulti, welcome socket, port scanning, same port on different hosts, http well-known port is 80, minimal transport service, multi/demultiplex, light error checking, connectionless, DNS over UDP, app controls data, no connection establishment, no connection state, small packet overhead, checksum, 1s complement sum, link-by-link reliability, in-memory error detection, end-end principle, error detection, error recovery, isNAK(), isACK(), corrupt(), stop-and-wait, error recovery, duplicate packets, sequence number, duplicate ACKs, lossy channel, bit errors, duplicate data packet, countdown timer, alternating-bit protocol, pipelining, Go-Back_n, window size, sliding-window protocol, cumulative acknowledgement, Selective Repeat, reliable data transfer, unidirectional data tranfer, rdt_send(), udt_send(), deliver_data(), rdt_recv(), bidirectional, FSM, perfectly reliable channel, make_pkt(), extract(), channel with bit errors, positive acknowledge, negative acknowledge, ARQ protocols, error detection, ACK, NAK, retransmission
  • Coding.
    • Continue to post examples from class in GitHub.
    • Assignment 1 from Chapter 2.
      • Complete any missing features to the web server assignment from last week.
      • Implement the conditional GET. The server should be able to accept requests from existing HTTP clients, like Firefox and Chrome.
    • Assignment 3 from Chapter 2.
      • Start with the Mail Client script.
      • Modify the script so it can accept input from an HTTP browser. You may think of this script as a web server, whose purpose is to send email, instead of serving files.
      • Create a user-interface for the script with an HTML page that contains a form.
        • The form should accept the From and To addresses, along with the Subject and Message.
        • When the button is clicked, the data should go to the port on ocelot that is associated with the mail script.
        • You do not need error processing for this script. That feature will be added in the future.
  • Labs
    • Chapter 2 - Wireshark Lab: Exploring DNS
    • Chapter 3 - Wireshark Lab: Exploring TCP
    • Chapter 3 - Wireshark Lab: Exploring UDP
  • Problems
    • Chapter 2 Review Questions: R21 through R24
    • Chapter 2 Problems: P19, P22, P25, P27, P28
    • Chapter 3 Review Questions: R1, R3 through R16 R13
    • Chapter 3 Problems: P1 through P5, P8, P11, P12, P22, P23, P24
• Week 4
  • Definitions from 3.5, 3.6, 3.7, 4.1, 4.2, 4.3, 4.4
    • connection-oriented, full-duplex, point-to-point, three-way handshake, send buffer, max segment size (MSS), max transmission unig (MTU), TCP segments, source and destination, checksum, sequence number, acknowledgement number, receive window, header length field, options field, ACK, RST, SYN, FIN, PSH, URG flags, urgent data pointer field, cumulative acknowledgement, piggybacked acknowledge, RTT, double timeout interval, fast retransmit, selective acknowledgement, flow control, congestion control, receive window, SYNACK segment, SYN flood attack, SYN cookies, per-connection throughput, offered load, end-to-end control, network-assisted control, choke packet, ATM ABR congestion control, resource-management cells, EFCI bit, CI and NI bits, ER field, self-clocking, lost segment, acknowledged segment, bandwidth probing, congestion-conrol algorithm, slow start, TCP splitting, congestion avoidance, fast recovery, TCP Tahoe, TCP Reno, additive increase, multiplicative decrease, TCP throughput, TCP over high bandwidth, fairness, Routing, Forwarding, Routing algorithms, Forwarding table, Routers, Link-layer switches, Datagram network, Forwarding table, Longest prefix matching, Prefix match, Link interface, Forwarding function, Input ports, Switching fabric, Output ports, Switching via memory, Switching via bus, Switching via interconnection network, HOL, IPv4 datagram format - all fields, DHCP, Temporary IP address, Plug-and-play protocol, DHCP discover message, DHCP offer message, DHCP request message, DHCP ACK, NAT, ICMP, IPv6 datagram format - all fields, Dual-stack, Tunneling
  • Coding.
    • Continue to post examples from class in GitHub.
    • Assignment 1 from Chapter 2.
      • Complete any missing features to the web server assignment from last week.
      • Implement the accept-language header.
        • The header will be in a format like en, es, de.
        • Create multple versions of a file named hello.html, but with an additional extension of the language abbreviation, like hello.html.en, hello.html.es, hello.html.de. Each file will have 'hello' in it in the appropriate language.
        • If the user requests hello.html, look at the accept-language header and check if one of the languages has a file for it. Choose the first on in the list that is also a language that your site supports. Return the language file.
    • Implement an FTP server.
      • Use the FTP server from the lectures. Use your email for the anonymous log in.
      • Display a page that contains the listing of the root index of the server.
      • Have a text box for the user to enter the name of the file or directory from the current directory. Use POST to pass the data to the server.
      • If the name is for a file, then download it. If the name is for a directory, then redisplay the page with the new directory listing.
  • Problems
    • Chapter 3 Review Questions: R14 through R18
    • Chapter 3 Problems: P25, P26, P27, P31, P37, P40, P44
    • Chapter 4 Review Questions: R3, R8 through R12, R15, R17, R18
    • Chapter 4 Problems: P7, P9, P10, P11, P20, P21
• Week 5
  • Definitions from 4.5, 4.6, 5.1, 5.2, 5.3, 5.4.1
    • First-hop router,Source router,Default router,Destination router,Graph,Nodes,Edges,Path,Least-cost path,Shortest path,Global routing algorithm,Link-state algorithm,Decentralized routing algorithm,Distance-vector algorithm,Static and dynamic routing algorithms,Load-sensitive in insensitive algorithms,Bellman-Ford equation,Routing tables,Routing loop,Count-to-infinity,Poisoned reverse,Message complexity,Speed of convergence,Robustness,Routing scale,Routing administrative autonomy,AS,Intra-AS routing,Gateway routers,Inter-AS routing,Hot-potato routing,Interior gateway protocols,RIP,OSPF,RIP response message,RIP advertisements,OSPF security,Multiple same-cost paths,OSPF support for hierarchy,Area border routers,Backbone,BGP,BGP peers,eBGP,iBGP,Node,Link,Link-layer frame,Framing,Link access,Reliable delivery,Network adapter,NIC,Bit-level error detection,Bit-level error correction,EDC,Undetected bit errors,Parity bit,Two-dimensional parity,FEC,Internet checksum,CRC,Polynomial codes,generator,Point-to-point link,Broadcast link,Multiple access problem,MAC protocol,collide,Channel partitioning protocols,Random access protocols,Taking-turns protocols,MAC desirable characteristics ,TDM,Time frames,Time slots,FDM,Slotted ALOHA,Successful slot,ALOHA,CSMA,CSMA/CD,Channel propagation delay,Binary exponential backoff,Polling protocols,Polls,Token-passing protocol,Token,DOCSIS,Protocols used in DOCSIS,Link-layer addressing,ARP,MAC address,ARP packet
  • Coding.
    • Continue to post examples from class in GitHub.
    • Write a proxy server that does not allow access to youtube and bing.
      • The proxy will receive requests for URLs.
      • For each URL that is requested, create a folder. Create subfolders for each path in the URL. Store the cached copy of the file in that folder.
      • Send a request to the URL. If a 304 is returned, then send the cached copy of the file to the original client. If 200 is returned, cache the new copy and then send it to the client.
      • Do not allow access to youtube and bing.
    • Write an HTML file that uses Ajax.
      • In the page, list several buttons with the name of a state, like FL, GA, AL. Choose the states you want. Include at least three.
      • Name a div element that will contain cities.
      • When a button for a state is clicked, initiate an Ajax request that populates the box with several cities from that state. Choose at least three cities for each state.
  • Problems
    • Post answers to weekly questions in GitHub.
    • Chapter 4 Review Questions: R21-R27, R30
    • Chapter 4 Problems: P27, P28, P30, P34, P37, P38
    • Chapter 5 Review Questions: R2, R3, R5, R7-R12
    • Chapter 5 Problems: P1, P2, P5, P6, P11, P14-P18
• Week 6
  • Definitions from 5.4, 5.7, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6
    • Link-layer addressing,ARP,MAC address,ARP packet,Ethernet,Ethernet frame structure,Switch is transparent,Filtering and forwarding,Switch table,Self-learning,Plug-and-play devices,Elimination of collisions,Heterogeneous links,Self-Management,Server Communication,Confidentiality,Message integrity,End-point,authentication, Operational security,Hacker Eavesdropping,Hacker,Modification,Hacker Insertion,Hacker Deletion,Plaintext,,ciphertext,Encryption algorithm, Decryption algorithm,Symmetric key,system,Public key system,Block Cipher, Stream Cipher,Cipher-block Chaining,Initialization Vector,Public/private keys,RSA,Extended Euclidean Algorithm for finding d*e = 1 mod n (not in book),Encrypt and decrypt with RSA,Message integrity,Cryptographic hash,MAC code,Authentication key,Digital signature,Public key certification,Certification authority,End-point authentication, Authentication protocol,Playback attack,Nonce,PGP,Confidentiality,Sender authentication,Message integrity,Secure Sockets Layer,Transport Layer Security,SSL Handshake,Key derivation,SSL Record,Pre-master secret,Connection closure
  • Coding.
    • Continue to post examples from class in GitHub.
    • Write a stand-alone web server that handles cookies.
      • The web server only has to display one, dynamic page. The page will display all the cookies that the browser sends to the server.
      • The web server should write two cookies on each response. You get to determine the names and values of the cookies that your server sends.
      • Add a link on your ocelot welcome page to your server, if you do not have such a link already.
    • Modify your mail client so that it can contact a mail server that requires authenitcation.
      • Implement the client as a CGI script.
      • The client should display a page with To, From, Subject and Message fields, like the earlier assignment.
      • When a request is made, log into the authenticated server and send the message.
      • Redisplay the original page, with a dynamic message indicating that the mail was sent.
      • Add a link on your ocelot welcome page to your server, if you do not have such a link already.
  • Problems
    • Post answers to weekly questions in GitHub.
    • Chapter 5 Review Questions: R9-R12, R14
    • Chapter 5 Problems: P14-P18, P21, P22, P26, P31
    • Chapter 8 Review Questions: R1, R5, R6, R9, R10, R13, R15, R16, R19, R23
    • Chapter 8 Problems: P1, P3-P8, P12, P17, P18
• Homework 1: I will review questions from the homework on Monday, 9/19
  • I have created a forum on Moodle for posting and answering questions about HW1.
  • Chapter 1 Review Questions: R1, R4, R5, R11, R12, R13, R16, R18, R19, R23, R24, R25
  • Chapter 1 Problems: P4, P8, P10, P13, P20, P24, P31.
  • Chapter 2 Review Questions: R1 - R19, except R18.
  • Chapter 2 Problems: P1, P4, P5, P10, P11, P14, P15, P17.
  • Python: Write a program in Python that makes change. It accepts a number of cents and displays the number of dollars, quarters, dimes, nickels, and pennies that it is equivalent to. The program should loop until a negative number of cents has been entered. Use methods and exception handling.
  • The notes from the homework review are in the ch2 lecture on the Ubiquitous Presenter site.
• Extra Credit
  • Submitting Homework Online. When you are asked for a username and password, use your webmail username with the password that I sent to you.
  • Submitting Homework from Unix
  • Extra Credit 1 - cgi-bin
    Web pages
    • Creating a web folder on ocelot.
    • Python CGI Scripts
  • Extra Credit 2 - SMTP
  • Extra Credit 3 - FTP
  • Extra Credit 4 - Conditional GET
  • Extra Credit - Parse Input
    Videos
    • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
    • URL decoding
    • Parsing form data
    • CGI script to process form data
• Scripts for Exam 1
  • Write a web server that implements a conditional GET, using the If-modified-since header. The web server only has to be able to return one file, but it must be an actual file. If the browser already has the file, only send the appropriate HTTP response to indicate that the browser already has the file. Request a port for your web server, so we can minimize the chance of students using the same port.
  • Modify the FTP script so that it downloads a file. First, try downloading the README.txt from the root folder. Second, list the contents of a subdirectory that has files. Third, download a file from a subdirectory.
  • Run the SMTP script and send a message to bytesizebook@gmail.com. Modify the script so that it includes a header named X-MC-Tags with the value of your FIU email username.
  • Write some pseudo code that implements a web proxy.
  • Create a web folder on ocelot named public_html in your root folder. Change the permissions to 705.
    • Change the permissions on your root folder to 701 with chmod 701 ~
    • Create a subfolder of public_html named cgi-bin. Change the permission to 705.
    • Write a CGI script on ocelot. Save it in the cgi-bin folder. Change its permission to 705. Be sure the file has a .cgi extension, not .py. Parse all the data that is sent to the form from a browser. Display each name value pair in a sentence like "The input element with name team has the value Heat". Display the request method that was used to submit the data.
    • Create a file named form.html that has two forms in it. One form uses GET, the other uses POST. The GET form should have three text elements, the POST form should have four. Both forms have an action set to your script. Place the file in public_html. Set its permissions to 604. Add a submit button in each form to submit it.
    • Open the form.html file in a browser, using the URL ocelot.aul.fiu.edu/~your-user-name/form.html. Click each button and see that the appropriate response appears for each.
• Homework 2: I will review questions from the homework on Monday, 10/24
  • Chapter 3 Review Questions: except R5 and R19.
  • Chapter 3 Problems: P1-P5, P8-P12, P14, P22-P27, P29, P31, P34-P37, P40, P43, P44, P46, P55
    • More information about cwnd.
    • Clarification about P43. P43 states that the Host A is capable of sending data into the TCP socket at a rate of S bps, where S = 10 * R. R is the transmission rate of the link. The book aslo mentions that Host A has a buffer. A better description is that Host A is capable of sending data into the buffer at a rate of S bps and the buffer can send data into the link at R bps.
  • Chapter 9: R1, R2, R4, R6, R12.
  • Chapter 9: P6, P7.
• Homework 3: I will review questions from the homework on Monday, 11/30
  • Chapter 4 Review Questions: Several of the questions refer to virtual circuits; we did not cover them. You may omit the parts of any questions that refer to virtual circuits (VC). R1, R3, R8-R12, R15-R19, R21-23, R32, R33.
  • Chapter 4 Problems: P7, P9, P24-P28, P30-P32, P34, P42-P44, P46-P48
  • Chapter 5 Review Questions: R1-R3, R5-R12.
  • Chapter 5 Problems: P1-P6 P7, P11, P14-P17 -P19, P21, P22, P26, P31
  • Chapter 8 Review Questions: R1, R3, R5-R10, R13, R15, R16, R19, R20. Correction: R5 should read 8-bit block cipher.
  • Chapter 8 Problems: P1, P3, P5, P8, P12
• Extra Credit 5
  • Submitting Homework Online. When you are asked for a username and password, use your webmail username with the password that I sent to you.
  • Submitting Homework from Unix
  • Extra Credit 5. Refer to the section on this page entitled CGI scripts that parse data and process web forms for videos that will help with the assignment.
• New: Extra Credit 6
  • Extra Credit 6
  • Submitting Homework Online. When you are asked for a username and password, use your webmail username with the password that I sent to you.
  • Submitting Homework from Unix

Video Demos

• Demo GitHub in Visual Studio
• Demo Telnet
• Demo Cookie
• Demo CGI
• Demo UDP Mod, SMTP, Dig
• Demo UDP Client and Server
• Demo TCP Client and Server
• Demo Web Server
• Demo UDP Pinger Client and Server
• Demo FTP Client
• Demo SMTP Client
• Demo Wireshark HTTP
• Demo HTTP Accept-Language
• Demo FTP Proxy Server

Video Lectures

• Web
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    HTML basics	web-basics
    Hypertext links and query string	web-basics (slide 13)
    Ajax and jQuery	web_ajax

• Chapter 1
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    Chapter 1 - Network Description	ch1 notes
    Chapter 1 - Packet and Circuit Switching	ch1 notes
    Chapter 1 - Delay, Loss and Throughput	ch1 notes
    Chapter 1 - Layers, Hacking and History	ch1 notes

• Chapter 2
  • Notes for some these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    5/10: Chapter 2 - Overview	ch2-intro
    5/10: Chapter 2 - Architectures, Applications and Transport Layer Features	ch2_2-1
    5/10: Chapter 2 - Web, HTTP, Persistence	ch2_2-2_to_2-2-2
    5/10: Chapter 2 - HTTP	ch2 (slide 20)
    5/10: Chapter 2 - HTTP Example	No notes
    Chapter 2 - Cookies
    5/12: Chapter 2 - Cookies Example	No notes
    5/12: Chapter 2 - Caching	ch2 (slide 43)
    5/12: Chapter 2 - Caching Example	No notes
    5/12: Chapter 2 - FTP	ch2_2-3
    5/12: Chapter 2 - Mail	ch2_2-4
    5/12: Chapter 2 - Mail Example	No notes
    5/15: Chapter 2 - DNS	ch2_2-5
    5/15: Chapter 2 - P2P Introduction	ch2_2-6-intro-p2p
    5/15: Chapter 2 - P2P	ch2_2-3-2-6 (slide 37)

• Chapter 3
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    5/17: Overview	ch3_intro
    5/17: Transport Layer Services	ch3_3-1_to_3-3
    5/17: Connectionless Transport	ch3_3-1_to_3-3 (slide 10)
    5/17: Wireshark HTTP Demo	No notes
    5/19: rdt 2	ch3_3-4_rdt2
    5/19: rdt 3	ch3 (slide 27)
    5/19: Go-Back-N	ch3 (slide 30)
    5/19: Selective Repeat	ch3 (slide 36)
    5/22: TCP Flow Control	ch3 (slide 4)
    5/22: TCP Handshake, Congestion Control	ch3 (slide 56)
    5/22: TCP Congestion Control	ch3 (slide 67)

• Chapter 4
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    5/24: Inside a router	ch4_4-3
    5/24: IPv4	ch4_4-4
    5/24: DHCP, NAT, ICMP	ch4_4-4 (slide 9)
    5/26: Link State Algorithm	ch4_4-5
    5/26: Distance Vector Algorithm	ch4_4-5 (slide 7)
    5/26: Count-to-infinity	ch4_4-5 (slide 12)

• Chapter 5
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    5/31: Routing Protocols	ch4_4-6
    5/31: Routing Summary	ch4_4-6 (slide 15)
    5/31: Intro to Link Layer	ch5_5-1
    5/31: Error Checking	ch5-5_2
    6/1: Multple Access Protocols	ch5-5_3
    6/1: CSMA, CSMA/CD, Taking Turns, DOCSIS	ch5-5_3 (slide 13)
    6/1: MAC addresses and ARP	ch5-5_4

• Chapter 8
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    6/5: Symmetric Key Cryptography	ch8
    6/5: Public Key Cryptography	ch8 (slide 19)
    6/5: RSA Example	ch8 (whiteboard 2 - near slide 25)
    6/5: RSA Example	ch8 (whiteboard 2 - near slide 25)
    6/7: Securing Email	ch8_8-5
    6/7: Toy SSL	ch8_8-6_toy
    6/7: Real SSL	ch8_8-6_real

• Chapter 6
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    6/9: CDMA	ch6
    6/9: WiFi Access	ch6 (slide 8)
    6/9: Mobility	ch6_6_4_to_6_5 (slide 15)

• Chapter 7
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    6/12: VoIP	ch7-7_1-7_3 (slide 28)/a>

• Chapter 9
  • Notes for some of these videos are in the classroom for videos and from the previous summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.

    Video	Notes
    6/12: Netwrok Management	ch9
    6/12: ASN.1	ch9 (slide 13)

• Chapter 2
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 2 - P2P
  • Chapter 2 - Sockets
  • Chapter 2 - Sockets Examples
  • Chapter 2 - Application - Web Server
• New: Chapter 2
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 2 - Ping Client and Server
  • Chapter 2 - Ping Client and Server Examples
  • Chapter 2 - SMTP and FTP Clients
  • Chapter 2 - SMTP and FTP Client Examples
  • Chapter 2 - Web Proxy Application
• Chapters 2 and 3
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 2 - URL decoding
  • Chapter 2 - Parsing form data
  • Chapter 2 - CGI script to process form data
  • Chapter 3 - Multiplexing and demultiplexing
• Chapter 3
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 3 - Multiplexing and demultiplexing
  • Chapter 3 - Reliable Transport Samples
  • Chapter 3 - Go-Back-N
  • Chapter 3 - Selective Repeat
• Chapter 3
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 3 - TCP Introduction
  • Chapter 3 - TCP Flow Control
  • Chapter 3 - ATM Congestion Control
  • Chapter 3 - TCP Congestion Control
• Chapter 4
  • Notes for these videos are in a new classroom named videos_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 4, Section 4.4 - DHCP, NAT, ICMP
  • Chapter 4, Section 4.5 - Link State
  • Chapter 4, Section 4.5 - Distance Vector
  • Chapter 4, Section 4.5 - Routing loop and Heirarchical routing
• Chapter 5
  • Notes for these videos are in a new classroom named videos_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 5, Section 5.2 - ECD
  • Chapter 5, Section 5.3 - MAC, SLotted ALOHA, ALOHA
  • Chapter 5, Section 5.3 - CSMA and Taking Turns
  • Chapter 5, Section 5.4 - ARP
• Chapter 8
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 8, Symmetric keys
  • Chapter 8, Public keys
  • Chapter 8, RSA
  • Chapter 8, Authentication
• Chapters 8 and 6
  • Notes for these videos are in a new classroom named videos_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 8, Toy SSL
  • Chapter 8, Real SSL
  • Chapter 6, Introduction
  • Chapter 6, Wireless Networks and CDMA
  • Chapter 6, Cellular Networks
• Chapter 7
  • Notes for these videos are in a new classroom named videos_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • Chapter 7, Audio
  • Chapter 7, Video
  • Chapter 7, Streaming
  • Optional: Chapter 7, VoIP

Miscellaneous

• Download the following python scripts that were covered in a lecture. Run them on your machine. You can access the source through the links below, or access the ~downeyt/public_html/cnt4713/scripts folder from your ocelot account.
  • array.py
  • if.py
  • import.py, also needs numbers.py
  • import_from.py, also needs numbers.py
  • except.py
    1. Run it as it is.
    2. Create an empty file named myfile.text, then run the script.
    3. Add an integer to the file, then run the script.
• A page for accessing some python scripts: script.html.
  • Experiment with GET and POST
  • Change a cookie each time it is sent to the browser.
• Guided and Unguided Media
• Running CGI scripts on ocelot.
  • Creating a web folder on ocelot.
  • Python CGI Scripts
• CGI scripts that parse data and process web forms
  • Notes for these videos are in the classroom from the summer, named 1605_cnt4713. You will have to find the classroom and register in it. The password is netcentric. Click on the Enroll/unenroll link on the UP site and look for the class.
  • You may also want to view the videos from earlier in the course on HTML basics and hypertext links and query string.
  • URL decoding
  • Parsing form data
  • CGI script to process form data
• Active versus Passive FTP
• FTP Session Interactions
• Go-Back-N/Selective Repeat
• A different BGP NEXT-HOP explanation
• Ajax Example

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