1. The internet

2. Computer Server This is a computer A network is a combination of computers and servers. They are all connected to allowing them to share information. Most of the time, computers are connected to one another through a server. But sometimes computers are directly connected to each other.

3. Your home Computer LaptopPrinter Computer Phone T.V Box Router Information

4. Your ISP Internet Service Provider Home network (LAN) Home network (LAN) Home network (LAN) Home network (LAN) Home network (LAN) Home network (LAN) www.website.com Website Request Website html data

5. The Internet. ISP

6. IP Address Computer All computers have names. Computers names arent as unique as Alex, Jason, Susan, Jamie, etc. Computers like numbers. 68.29.54.176 201.205.30.60 89.99.186.7666.69.175.72 112.139.118.21 248.124.215.129 Bad! Very good!

7. Websites? 64.4.11.37 Internet Service Provider Microsoft.com http://64.4.11.37/

8. Information Sending – Packets – UDP – Sending Packets Computer 00 01 Computer 00 02 Computer 00 03 00 02 Hello How are you doing? 00 01 Hi! Im doing fine! Basic Packet Protocol Who are you sending the information to? What is the information you want to send?

9. Information Sending – Packets – UDP – Out of Order! Computer 00 01 Computer 00 02 Computer 00 03 00 02 Hello Basic Packet Protocol Who are you sending the information to? What is the information you want to send? 00 02 How 00 02 Are you 00 02 Doing? Oh no! The packets didnt all arrive at the same time, so theyre all out of order!

10. Information Sending – Packets – UDP – Reorder those packets. Computer 00 01 Computer 00 02 Computer 00 03 00 02 0 Hello Basic Packet Protocol Who are you sending the information to? What is the information you want to send? 00 02 1 How 00 02 2 Are you 00 02 3 Doing?

11. Information Sending – Packets – UDP – Broken Connections Computer 00 01 Computer 00 02 Computer 00 03 00 02 0 Hello Basic Packet Protocol Who are you sending the information to? What is the information you want to send? 00 02 1 How 00 02 2 Are you 00 02 3 Doing?

12. Information Sending – Streams – TCP – Sending Packets 00 0100 02 00 03 Stream protocol Form connection with end computer Send information. Form Stream connection Hello how are you doing?

13. Information Sending – Streams – TCP – Stream of Information 00 0100 02 00 03 Stream protocol Form connection with end computer Send information. 01001000011001010110110001101100011011110010000100100000010010000110111101110111001000000110000101110010011001010010000001111001011011110111010100100000011001000110111101101001011011100110011100111111

14. Information Sending – Streams – TCP – There is no end. 00 0100 02 00 03 Stream protocol Form connection with end computer Send information. Do the Laundry Take out the Trash Sweep the Floor Mow the Lawn 00 00 00

15. Student Activity: Creating Protocols 00 0100 02

16. Imagine two computers are connected by either a literal connection or through a stream. 00 0100 02 The first computer sends some information to the second computer. You dont exactly know how the packets are structured however. 00 02 Hello Friend

17. 00 0100 02 Packets have a chance of getting very complex! They can contain things like : Where theyre going Who sent it. What kind of information. Commands. Send to: 00 02 Piece: 0 Message: Hello Friend! Command: Delete after reading. End: 00 00 00 Imagine two computers are connected by either a literal connection or through a stream.

18. 00 0100 02 If 00 01 sends a packet of random information to 00 02, can you decode it and find out what information is being sent? What order is the information in? (00 02) (00) (He ll o_) (00 00 00) (00 02) (01) (fr _i e_) (00 00 00) (00 02) (02) (nd !_ __) (00 00 00) (00 02) (03) (00 00 00) Imagine two computers are connected by either a literal connection or through a stream.