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NYC College of Technology

CS 607: LAN Connectivity (Spring 2010)

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Announcements

Required for all Assignments

Required Text

Reference Texts

Assignments

In Class

• The Class Web page is located at CVibes.net. (No www. prefix!)
  • All assignments, reading and written, will be posted only at CVibes.net
  • Assignments will never be posted in Blackboard
• Blackboard via the CUNY Portal
  • Exams and quizzes will be administered via Blackboard
  • Make sure that you know your CUNY Portal user name and password. If you don't already have a CUNY Portal ID, then Register Now
  • Log into Blackboard to verify that you have access as soon as possible
• News:
  • Flaw in versions 6, 7, and 8, of Internet Explorer. Google, Adobe, and many other companies were hacked because this flaw.
  • 16-bit VM flaw in all versions of Windows
• Why You Should Not Run as an Administrator or Root User
  • Principle of Least Privilege
• How and Why you should Disable AutoPlay / AutoRun in Windows
• Backing Up: 3-2-1 Rule
  • 3: Have three copies of your files. The original, plus 2 copies
  • 2: On different storage mediums. e.g. separate hard drive, optical (CD/DVD), tape
  • 1: Have a current backup offsite / online :
    • Carbonite.com, JungleDisk with Amazon S3, Gmail Syn
• Windows Home Server
  • Windows Home Server Review by Paul Thurrott
• Malware (short for malicious software)
• The key to solving the malware problem is avoidance, not detection and removal.
• Rootkits : You can never be sure you've gotten rid of one...
• Protocol Review:
  • DNS (Domain Name System) (or Service or Server)
  • DHCP (Dynamic Host Configuration Protocol)
  • NAT (Network Address Translation)
• Review: Troubleshooting Client Network Connectivity
  • Automatic Private IP Addressing (APIPA)
    • IPv4 Link-Local address assignment (IPV4LL)
    • The Internet Assigned Numbers Authority (IANA) has reserved 169.254.0.0-169.254.255.255 (169.254.0.0/16) for Automatic Private IP Addressing. As a result, APIPA provides an address that is guaranteed not to conflict with routable addresses.
    • How to use automatic TCP/IP addressing without a DHCP server
  • IPConfig /all
  • Ping

Read

• Chapter 19 of Data Communications and Networking, 4th Ed.
• Microsoft warns of flaw in 32-bit Windows kernel
• Microsoft fixes 8 IE holes, including one used in attacks
  • Microsoft Security Advisory (979352): Vulnerability in Internet Explorer Could Allow Remote Code Execution
• Classless Inter-Domain Routing (CIDR)
• Automatic Private IP Addressing (APIPA)

Do

• Assignment #1, Due Tues. 2/2/2010
  • Review Questions 1 - 10 at the end of Chapter 19, pg. 574
  • Submit a typed hardcopy (with the questions) at the beginning of class.
    • Make sure to have an extra hardcopy for yourself to use during class. We will go over the review questions and exercises in class without the use of the computers.
  • Remember: No late assignments will be accepted

• Send me an e-mail, before 9AM tomorrow, from the e-mail address I will use to contact you for the rest of the semester.
  • You must include your first and last names and your daytime or mobile phone number.

February

In Class

• Assignment #1 Debriefing
• Protocol Review:
  • OSI Reference Model (pdf
• Classfull IP Addressing
• The destinction between "Mask" and "Default Mask" (p. 553)
• Wireless Network Security
  • WEP (Wired Equivalent Privacy) : Due to known security issues with WEP encryption, it is recommended that you use only WPA2-Personal-PSK (preferred) or WPA PSK. WEP can easily be cracked in under a minute.
  • Wi-Fi Protected Access (WPA and WPA2)
  • Wi-Fi Protected Access 2 (WPA2) update for Windows XP SP2
  • When using WPA2, use AES encryption only, instead of TKIP+AES
    • SecurityNow! Episode 170 discusses the TKIP (Temporal Key Integrity Protocol) hack
• GRC's Ultra High Security Password Generator

Read

• Chapter 19 of Data Communications and Networking, 4th Ed.
• Read Appendix B: Numbering Systems.
  • Pay special attention to section B.4 Base 256: IP Addresses
• Principle of Least Privilege
• Why You Should Not Run as an Administrator or Root User

Do

• Memorize the OSI Reference Model
• Send me an e-mail from the e-mail address I will use to contact you for the rest of the semester.
  • You must include your first and last names and your daytime or mobile phone number.

In Class

• TCP/IP Tutorials and TCP/IP Links
• SecurityNow! Netcast by Steve Gibson and Leo Laporte
• Classless IP Addressing
• Converting from decimal to binary
• Determine the network address by ANDing the binary subnet mask with a binary IP address
  • ANDing 2 bits: If both bits are 1, then the result is 1. Otherwise, the result is 0.
  • ORing 2 bits: If both bits are 0, then the result is 1. Otherwise, the result is 0.
• How to: Convert a Decimal Number to an IP Address (Base 256)
• TCP/IP Ports
  • The port number identifies the protocol or process used for communication
  • The state of TCP/IP ports are: Open or Closed or Stealth
    • Stealth means that a port is closed "and" does not return a response to a query.
• SecurityNow! Netcast by Steve Gibson and Leo Laporte

Read

• View: OSI Model Training Tutorial (1 of 3)
• View: OSI Model Training Tutorial (2 of 3)
• View: OSI Model Training Tutorial (2 of 3)
• View: Understanding the OSI Reference Model by Cisco Systems & presented by Eric Jefferson

Do

• Assignment #2, Due Tues. 2/9/2010
  • Do Exercise Questions 12 - 38 (even numbered only) at the end of Chapter 19, pgs. 575 - 577
  • Submit a typed hardcopy (with the questions) at the beginning of class.
    • Make sure to have an extra hardcopy for yourself to use during class. We will go over the exercises in class, and the computers will be turned off
  • Remember: No late assignments will be accepted.
• Use ShieldsUp to test your firewall and router to see if you have any open or closed ports.
  • Give me a status report on the state of your ports at the beginning of our next class.

In Class

• News
  • Comcast starts IPv6 trials: Comcast will begin in April a series of public trials of three different mechanisms that are aimed at helping the Philadelphia-based ISP transition its network to IPv6, the next-generation Internet Protocol.
• ShieldsUp Results
  • How many of your computers had open ports?
  • Which ports were open?
• Determining the number of bits to use for netid or hostid

Memorize these Bit Patterns and Common Mask Values

10000000 = 128
11000000 = 192
11100000 = 224
11110000 = 240
11111000 = 248
11111100 = 252
11111110 = 254
11111111 = 255

Subnets / Bits / Subnet Mask Cross-reference

• Logarithm (2 to the how many bits would give us the value of x?)
• Three Levels of Hierarchy: Subnetting (p. 559)

Read

• IPv6: The essential guide : 10 must-read stories about the next-generation Internet Protocol
• IPv4 subnetting reference
• Subnetwork

Do

• Read: Chapter 20 of Data Communications and Networking, 4th Ed.

In Class

• Assignment #2 Debriefing
  • Determining the last address of a subnet
  • Determining the first address and the last address of the 1,024th subnet

Read

• IPv4 subnetting reference
• Subnetwork

Do

• Study for Quiz 1 on Tuesday

In Class

• Unicast, Broadcast, Multicast
• localhost / 127.0.0.1 / Loopback Address
• Network Address Translation (NAT) [Ch. 19, p. 563]
• Media Access Control (MAC) address
  • Decoding
• Quiz #1: Covering, but not limited to the following:
  • Chapter 19: Network Layer: Logical Addressing
    • All key words from chapter 19
  • Subnetting and IP block allocation
    • Determine how many bits are needed for the netid. (Bits to borrow)
    • Determine how many bits are needed for the hostid.
    • Determine the subnet mask
    • ANDing the subnet mask with an IP address to determine the network address.
    • Converting a decimal to Base-256
    • Converting from decimal to binary
    • Converting from binary to decimal
  • OSI Reference Model (See Chapter 2: pgs. 29 - 50)
    • All 7 layers of the OSI Reference Model (Layer number, Layer name, Layer function)
      • Layer numbers
      • Layer names
      • The responsibilities/functions of each layer
      • Which layers major protocols function on. e.g. TCP, UDP, IP, Telnet, FTP, etc.
    • Which devices operate at which layers. e.g. Switches, Routers, Hubs, NIC's, etc.
  • Status/Troubleshooting Commands for hosts/Windows PC's
    • ipconfig, ping

Read

• Chapter 20 of Data Communications and Networking, 4th Ed.

Do

• Quiz 2: Due Friday 2/19/2010 no later than 8PM in Blackboard.

Read

• Chapter 20 of Data Communications and Networking, 4th Ed.
• Understanding IP Addressing: Everything You Ever Wanted To Know by Chuck Semeria
  
• TCP/IP Tutorials and TCP/IP Links
• Converting from Decimal to Base-256 (Revised)
  

In Class

• Quiz 1 Debriefing
• Assignment #2 Debriefing, continued

Read

• Chapter 20 of Data Communications and Networking, 4th Ed.

Do

• Complete Q. 26 from Chapter 19

In Class

• Assignment #2 Debriefing, continued. (Chapter 19 Q. 26)

Read

• Chapter 20 of Data Communications and Networking, 4th Ed.

Do

• Do Questions 26 and 27 from Chapter 19 again to make sure that you fully understand how to subnet and convert a decimals to Base-256.

March

In Class

• Another Subnetting Method
• localhost / 127.0.0.1 / Loopback Address

Read

• Chapter 20 of Data Communications and Networking, 4th Ed.

Do

• Assignment #3, Due Tues. 3/9/2010
  • Do Exercise Questions 2 - 24 (even numbered only) in Chapter 20, pgs. 607 - 609
  • Submit a typed hardcopy (with the questions) at the beginning of class.
    • Make sure to have an extra hardcopy for yourself to use during class. We will go over the exercises in class, and the computers will be turned off
  • Remember: No late assignments will be accepted

In Class

• Banking Trojan steals money from under your nose
• School shows off its laptop surveillance tactics

Read

• How a Broadcsast Address Works

Do

• Assignment 4, Due Tues. 3/9/2010
  • Subnet 193.200.7.0 /24 in to subnets of at least 13 hosts per subnet. (update: 3/6/2010 8:50PM)
  • Submit a typed hardcopy (with the questions) at the beginning of class.
    • Make sure to have an extra hardcopy for yourself to use during class when we go over this assignment.
  • Remember: No late assignments will be accepted

In Class

• Assignment 3, Debriefing
• Assignment 4, Debriefing
• IPv4 Header structure
• TCP/IP Packet

Read

• Microsoft Security Intelligence Report volume 7 (January - June 2009) Summary: http://sans.org/info/55704
• Microsoft: Don't press F1 key in Windows XP
• Build Your Skills: Subnetting and supernetting IP networks

Do

In Class

• Underhanded C Contest
• IPv6 Addresses
• Transition from IPv4 to IPv6 (3 strategies)
  • Dual Stack (p. 604)
  • Tunneling
  • Header Translation
• FOLDOC (Free On-line Dictionary of Computing)

Read

• Chapters 19, and 20

Do

• Study for Exam #1 on Tues.

In Class

• Exam #1: Covering, but not limited to the following:
  • Chapter 19 & 20: Network Layer: Logical Addressing & Internet Protocol
    • All key words from chapter 19 & 20
  • Subnetting and IP block allocation
    • Determine how many bits are needed for the netid. (Bits to borrow)
    • Determine how many bits are needed for the hostid.
    • Determine the subnet mask or prefix
    • ANDing the subnet mask with an IP address to determine the network address.
    • Converting a decimal to Base-256
    • Converting from decimal to binary
    • Converting from binary to decimal
  • OSI Reference Model (See Chapter 2: pgs. 29 - 50)
    • All 7 layers of the OSI Reference Model (Layer number, Layer name, Layer function)
      • Layer numbers
      • Layer names
      • The responsibilities/functions of each layer
      • Which layers major protocols function on. e.g. TCP, UDP, IP, Telnet, FTP, etc.
    • Which devices operate at which layers. e.g. Switches, Routers, Hubs, NIC's, etc.
    • Encapsulation (p. 33)
  • Status/Troubleshooting Commands for hosts/Windows PC's
    • ipconfig, arp, ping, tracert, etc.
  • Transition from IPv4 to IPv6
    • The three strategies for the transition from IPv4 to IPv6, and their definitions
    • Advantages of IPv6 over IPv4

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April

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May

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Final Exam

The final exam will be comprehensive.

Recommended Web Sites and Books