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Skills: none Concepts: data and program files, IP packet, packet header, packet body, IP address, host name This work is licensed under a Creative Commons.

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Presentation on theme: "Skills: none Concepts: data and program files, IP packet, packet header, packet body, IP address, host name This work is licensed under a Creative Commons."— Presentation transcript:

1 Skills: none Concepts: data and program files, IP packet, packet header, packet body, IP address, host name This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. IP packets and addresses

2 Where does this topic fit? Internet concepts – Applications – Technology (communication) – Implications Internet skills – Application development – Content creation – User skills

3 Internet protocol (IP) packets 10011 11101 10101 00110 121.115.14.3155.135.1.1

4 A portion of a Web page, video stream, image, etc. To: From: (and more) Header Body Two parts of an Internet protocol (IP) data packet

5 What do you write on the front of an envelope? Is the packet header like the envelope or its contents? Comparing an envelope with a packet

6 0101010111001010100111001010101010101001 0101010101010101011001010100101010101001 Header1 | 01010101110010101001 Header2 | 11001010101010101001 Header3 | 01010101010101010110 Header4 | 01010100101010101001 Break the file into packets ↓ ↓

7 Internet protocol (IP) packets H1 | Body H2 | Body H3 | Body H4 | Body 121.115.14.3155.135.1.1

8 0101010111001010100111001010101010101001 0101010101010101011001010100101010101001 Re-assemble the image Header1 | 01010101110010101001 Header2 | 11001010101010101001 Header3 | 01010101010101010110 Header4 | 01010100101010101001 ↓ ↓

9 IP addresses and domain names http://155.135.55.165/ http://www.csudh.edu 155.135.55.165 = www.csufh.com What happens if you enter the URLs shown above? Why does it display a page when you only specified the domain name of the Web server and no file name like larry.html?

10 100110 101010 011101 100101 Summary

11 Self-study questions 1.An IP packet consists of two parts, what are they? 2.An IP header has several fields, three of them are __, __, and __. 3.What is the difference between an IP address and a host name? 4.What is the difference between an IP address and a URL? Why do we need both? 5.Is there any difference between an image and a copy made on a computer that retrieves it? Explain. 6.Why do you think the overall packet length limit of 65,535 bytes is such an odd number? 7.Is a receiving computer able to display any image it receives? Explain your answer.

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