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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

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

Syllabus and Class Layout CS2911 16 April 2019 Syllabus and Class Layout See http://faculty-web.msoe.edu/yoder/cs2911 SE-2811 Dr.Yoder Dr. Josiah Yoder

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

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

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

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

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

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

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

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

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

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

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

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

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

CS2911 16 April 2019 What's a byte? A byte is 8 bits. So 100010 can be written with two bytes: 0000 0011 1110 1000 How do you write this in hexadecimal? SE-2811 Dr.Yoder Dr. Josiah Yoder

Representing characters with bytes CS2911 16 April 2019 Representing characters with bytes ‘A’ ASCII characters: 0100 0001 ‘A’ 0100 0010 ‘B’ 0110 0001 ‘a’ 0011 0000 ‘0’ 0011 0001 ‘1’ 0000 1101 ‘\r’ CR (Carriage return) 0000 1010 ‘\n’ LF (Line feed, New line) 0010 0000 ‘ ’ (Space) code 0100 0001 Byte nibble character (17q1: edited after class) Dr. Josiah Yoder

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

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

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

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

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

Big endian / little endian CS2911 16 April 2019 Big endian / little endian 100010 can be written with the bytes big endian: most significant byte first 0000 0011 1110 1000 little endian: least significant byte first 1110 1000 0000 0011 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

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

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