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Slide design: Dr. Mark L. Hornick

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Presentation on theme: "Slide design: Dr. Mark L. Hornick"— Presentation transcript:

1 Slide design: Dr. Mark L. Hornick
CS2911 16 April 2019 CS2911 Week 1, Class 1 Today Introductions Syllabus and Class/Lab Layout Safety Review - Note about Lab Safety Review Networking a Game Network Layers and Packet Headers Lab 2 starts today! Binary encodings Muddiest Point print 1,12,13,16-19,22-26 SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick Errors: Dr. Yoder Dr. Josiah Yoder

2 Introductions Find someone you don’t know and learn
CS2911 16 April 2019 Introductions Find someone you don’t know and learn Their name One interesting thing they did this summer Be prepared to tell this to the rest of the class Just 2 minutes… make sure you all get a turn! SE-2811 Dr.Yoder Dr. Josiah Yoder

3 Syllabus and Class Layout
CS2911 16 April 2019 Syllabus and Class Layout See SE-2811 Dr.Yoder Dr. Josiah Yoder

4 Safety Review Take notes CS2911 16 April 2019 Dr. Josiah Yoder SE-2811
Dr.Yoder Dr. Josiah Yoder

5 Networking Sand Blaster
CS2911 16 April 2019 Networking Sand Blaster See handout SE-2811 Dr.Yoder Dr. Josiah Yoder

6 Network Layers Application Transport Network Link Physical
CS2911 16 April 2019 Network Layers Internet protocol stack Application Transport Network Link Physical SE-2811 Dr.Yoder Dr. Josiah Yoder

7 Nested Packets Ethernet Packet CS2911 16 April 2019 Dr. Josiah Yoder
Dr.Yoder Dr. Josiah Yoder

8 Nested Packets Ethernet Header Ethernet Payload CS2911 16 April 2019
Dr.Yoder Dr. Josiah Yoder

9 Nested Packets Ethernet Header IP Header IP Payload CS2911
16 April 2019 Nested Packets Ethernet Header IP Header IP Payload SE-2811 Dr.Yoder Dr. Josiah Yoder

10 Nested Packets Ethernet Header IP Header TCP Header TCP Payload CS2911
16 April 2019 Nested Packets Ethernet Header IP Header TCP Header TCP Payload SE-2811 Dr.Yoder Dr. Josiah Yoder

11 Nested Packets Ethernet Header IP Header TCP Header HTTP Header HTTP
CS2911 16 April 2019 Nested Packets Ethernet Header IP Header TCP Header HTTP Header HTTP Payload SE-2811 Dr.Yoder Dr. Josiah Yoder

12 Nested Packets Ethernet Header Ethernet Payload Ethernet Header IP
CS2911 16 April 2019 Nested Packets Ethernet Header Ethernet Payload Ethernet Header IP Header IP Payload Ethernet Header IP Header TCP Header TCP Payload Ethernet Header IP Header TCP Header HTTP Header HTTP Payload SE-2811 Dr.Yoder Dr. Josiah Yoder

13 Binary Encodings You can store anything as 1's and 0's
CS2911 16 April 2019 Binary Encodings You can store anything as 1's and 0's Exercise: Brainstorm the types of things that you might want to send over the internet SE-2811 Dr.Yoder Dr. Josiah Yoder

14 How do we send these things over the internet?
CS2911 16 April 2019 How do we send these things over the internet? You may need a few sheets of paper to hold your notes on this First page may be best in landscape SE-2811 Dr.Yoder Dr. Josiah Yoder

15 CS2911 16 April 2019 SE-2811 Dr.Yoder Dr. Josiah Yoder

16 CS2911 16 April 2019 Binary Hexadecimal 0000 0001 1 0010 2 0011 3 0100 4 0101 5 0110 6 0111 7 Binary Hexadecimal 1000 8 1001 9 1010 A 1011 B 1100 C 1101 D 1110 E 1111 F SE-2811 Dr.Yoder Dr. Josiah Yoder

17 CS2911 16 April 2019 What's a byte? A byte is 8 bits. So can be written with two bytes: How do you write this in hexadecimal? SE-2811 Dr.Yoder Dr. Josiah Yoder

18 Representing characters with bytes
CS2911 16 April 2019 Representing characters with bytes ‘A’ ASCII characters: ‘A’ ‘B’ ‘a’ ‘0’ ‘1’ ‘\r’ CR (Carriage return) ‘\n’ LF (Line feed, New line) ‘ ’ (Space) code Byte nibble character (17q1: edited after class) Dr. Josiah Yoder

19 CS2911 16 April 2019 Exercise: How to represent ASCII ‘A’, CR, and LF in hexadecimal? Exercise: How do you write the ASCII string "Cab" in hexadecimal bytes? SE-2811 Dr.Yoder Dr. Josiah Yoder

20 You are now ready to finish Lab 2!
CS2911 16 April 2019 You are now ready to finish Lab 2! Overview Lab 2 – see website SE-2811 Dr.Yoder Dr. Josiah Yoder

21 https://www.polleverywhere.com/free_text_polls/zIp2tH2IVWjXv4H CS2911
16 April 2019 What was the muddiest point? SE-2811 Dr. Josiah Yoder Dr. Josiah Yoder

22 CS2911 16 April 2019 Exercise Exercise: What does the byte 0x44 mean if interpreted as an ASCII character? Exercise: What does the byte 0x44 mean if interpreted as a binary number? SE-2811 Dr.Yoder Dr. Josiah Yoder

23 CS2911 16 April 2019 Binary Octal 000 001 1 010 2 011 3 100 4 101 5 110 6 111 7 Binary Octal unused 8 9 Dr. Josiah Yoder

24 Big endian / little endian
CS2911 16 April 2019 Big endian / little endian can be written with the bytes big endian: most significant byte first little endian: least significant byte first Ex: What do these look like in hexadecimal? Network order is BIG ENDIAN (whew!) Intel machines are LITTLE ENDIAN SE-2811 Dr.Yoder Dr. Josiah Yoder

25 CS2911 16 April 2019 Exercise 1: How many values can you represent with 1 bit? 2? 3? 4? 5? 6? 7? 8? 9? 10? n bits? Exercise 2: How many bits can you represent with a single decimal digit (0-9)? SE-2811 Dr.Yoder Dr. Josiah Yoder

26 CS2911 16 April 2019 Acknowledgement This course is based on the text Computer Networking: A Top Down Approach 7th edition Jim Kurose, Keith Ross Addison-Wesley Book image added later SE-2811 Dr. Josiah Yoder Dr. Josiah Yoder

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