User:Chotchki/BusDataComm

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Thursday 12 January 2006

• Why study data communications?

• 802.16 - WiMax

• IS and Business: Wal-Mart vs. Macy's

• Went over a brief history of communications
  • Batch Processing
  • ARPANET
  • AOL

• Datacomm Basics
  • Components
    • Protocol
    • Sender
    • Medium - the link between sender and receiver
    • Receiver
    • Message

• router and routing

• GET requests

• Network Types
  • LAN
  • MAN - Metropolitan Area Networks
  • WAN

• Intranets and Extranets

• multi-layer network models

Tuesday 17 January 2006

Had a sub today

Layers of programming

He mentioned the OSI in his discussion of the network layer model.

• Application Layer
• Presentation
• Session
• Transport
• Network
• Data Link
• Physical

Utterly useless, TCP/IP is really used

• Application Layer
• Transport
• Network
• Hardware

Tuesday 07 February 2006

TCP knowledge

• datagrams
• ports
  • went over common port assignments
• error correction
• window

Network Layer

• Internet Protocol

Thursday 09 February

Went over ICANN

binary -> decimal conversion

whois usage

Class A,B,C Networks

Class D is for multicast and Class E is reserved for future use.

Also the current classless scheme ie. 192.168.0.0/16

ipv4/6 NAT

routing

Tuesday 14 February 2006

talked about routing concerns

interior/exterior routing protocol

subnetting

netmasking User:Chotchki/BusDataComm/Assignment1

Test Review

OSI Model

4 Different kinds of applications

• web server

IETF - IEEE

application architecture

socket/port

Test/Quiz Results

99 for the Test

16.5 for the Quiz

Tuesday 28 February 2006

LAN Hardware Layers(Ethernet)

• The wire link from the computer to the router

Ethernet is used by 95% of today's LAN

Thursday 09 March 2006

Router and Switches

Medium Access Control and Carrier Sense Multiple Access w/ Collision Detect

Cyclic Redundancy Check - error checking and correcting

1. Take your data
2. Setup a division problem with the number 7
3. add 3 zeros to the end of the data
4. divide and the remander is the crc

To check the crc

1. take your data
2. Setup a division problem with the number 7
3. add the 3 digit crc to the end of the data
4. divide and if the answer is 0.... the data is most probably error free

Typical computer uses CRC32

Tuesday 21 March 2006

Thursday 04 April 2006

FIOS, DSL

Wireless 802.11 convience at the cost of security

• a
• b
• g

unregulated spectrum - 900mhz, 2.4ghz, 5.3ghz, 24ghz

collision detection vs. collision avoidance