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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 31 July 2018 CS2911 Week 1, Class 1 Today Introductions Syllabus Safety Review Lab 2 starts at our next meeting! 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 31 July 2018 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 31 July 2018 Syllabus and Class Layout See Instructional Vocabulary for ESL students SE-2811 Dr.Yoder Dr. Josiah Yoder

4 Safety Review Take notes CS2911 31 July 2018 Dr. Josiah Yoder SE-2811
Dr.Yoder Dr. Josiah Yoder

5 Binary Encodings You can store anything as 1's and 0's
CS2911 31 July 2018 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

6 How do we send these things over the internet?
CS2911 31 July 2018 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

7 CS2911 31 July 2018 SE-2811 Dr.Yoder Dr. Josiah Yoder

8 CS2911 31 July 2018 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

9 Representing characters with bytes
CS2911 31 July 2018 Representing characters with bytes ‘A’ ASCII characters: ‘A’ ‘B’ ‘a’ ‘0’ ‘1’ ‘\r’ CR (Carriage return) ‘\n’ LF (Line feed, New line) ‘ ’ (Space) Byte nibble Dr. Josiah Yoder

10 Required ASCII characters
CS2910 7/31/2018 Required ASCII characters Hex code Char 0d '\r' CR 30 '0' 41 'A' 61 'a' 31 '1' 42 'B' 62 'b' 0a '\n' LF … 43 'C' 63 'c' 38 '8' 44 'D' 64 'd' 20 ' ' SP 39 '9' 45 'E' 65 'e' 17q1 added after class, "Hex code" added day of Lab 3 SE-2811 Dr.Yoder Dr. Josiah Yoder

11 CS2911 31 July 2018 Exercise: How to represent ASCII ‘A’, CR, and LF in hexadecimal shorthand? Exercise: How do you write the ASCII string "Cab" in hexadecimal shorthand? SE-2811 Dr.Yoder Dr. Josiah Yoder

12 CS2911 31 July 2018 UDP Header Byte 1 2 3 Bit  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Source port Destination port 4 32 Length Checksum Wikipedia: User Datagram Protocol SE-2811 Dr.Yoder Dr. Josiah Yoder

13 You are now ready to finish Lab 2!
CS2911 31 July 2018 You are now ready to finish Lab 2! Overview Lab 2 – see website SE-2811 Dr.Yoder Dr. Josiah Yoder

14 Questions about Lab 2? What we've discussed today
CS2911 31 July 2018 Questions about Lab 2? What we've discussed today Python code in lab assignment Role of UDP in network stack … SE-2811 Dr.Yoder Dr. Josiah Yoder

15 CS2911 31 July 2018 Symbols SE-2811 Dr.Yoder Dr. Josiah Yoder

16 Exercise: Complete the hexadecimal column
CS2911 31 July 2018 Exercise: Complete the hexadecimal column Binary Hexadecimal 0000 0001 1 0010 2 0011 0100 0101 0110 0111 Binary Hexadecimal 1000 1001 1010 1011 1100 1101 1110 1111 f Dr. Josiah Yoder

17 CS2911 31 July 2018 Binary Octal 000 001 1 010 2 011 3 100 4 101 5 110 6 111 7 Binary Octal Decimal 1000 10 8 1001 11 9 1010 12 1011 13 1100 14 1101 15 1110 16 1111 17 SE-2811 Dr.Yoder Dr. Josiah Yoder

18 CS2911 31 July 2018 What's a byte? A byte is 8 bits. Exercise: Consider the hexadecimal byte-dump e8 02 1a ff Circle the first byte in this dump Write this byte in binary SE-2811 Dr.Yoder Dr. Josiah Yoder

19 CS2911 31 July 2018 Exercise Exercise: What does the byte 0x62 mean if interpreted as an ASCII character? Exercise: What does the byte 0x62 mean if interpreted as a binary number? SE-2811 Dr.Yoder Dr. Josiah Yoder

20 CS2911 31 July 2018 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

21 Big endian / little endian
CS2911 31 July 2018 Big endian / little endian can be written with the bytes big endian: most significant byte first (03 e8) little endian: least significant byte first (e8 03) Network order is BIG ENDIAN (whew!) Intel machines are LITTLE ENDIAN SE-2811 Dr.Yoder Dr. Josiah Yoder

22 Exercise Convert the number 700 to binary
CS2911 31 July 2018 Exercise Convert the number 700 to binary Write 700 in big-endian format (in binary) Convert the binary to hexadecimal shorthand Write 700 in little-endian (hexadecimal shorthand) Repeat for 443, 587 (these are ports we will use later in the quarter) SE-2811 Dr.Yoder Dr. Josiah Yoder

23 CS2911 31 July 2018 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

24 CS2911 31 July 2018 SE-2811 Dr. Josiah Yoder Dr. Josiah Yoder

25 CS2911 31 July 2018 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

26 CS2911 31 July 2018 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

27 Big endian / little endian
CS2911 31 July 2018 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

28 CS2911 31 July 2018 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

29 Wireshark Demo See Wireshark CS2911 31 July 2018 Dr. Josiah Yoder
Dr.Yoder Dr. Josiah Yoder

30 CS2911 31 July 2018 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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