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CS 1150 – Lab # 15 – Networking

CS 1150 – Lab # 15 – Networking. TA – Sanjaya Wijeratne E-mail – wijeratne.2@wright.edu Web Page - http://knoesis.org/researchers/sanjaya/. TA Labs, Office Hours Laboratory Polices. Lab Hours 2:30 PM - 4:20 PM, Monday and Friday at Room 320 - Oelman Hall TA Office Hours

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CS 1150 – Lab # 15 – Networking

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  1. CS 1150 – Lab #15 – Networking TA – Sanjaya Wijeratne E-mail – wijeratne.2@wright.edu Web Page - http://knoesis.org/researchers/sanjaya/

  2. TA Labs, Office Hours Laboratory Polices • Lab Hours • 2:30 PM - 4:20 PM, Monday and Friday at Room 320 - OelmanHall • TA Office Hours • 4:40 PM - 5:40 PM, Monday and Friday at Room 316 - Russ Engineer Center • By appointment – Please email to wijeratne.2@wright.edu • Refer to CS 1150 Course Syllabus for Class and Laboratory Policies • Zero tolerance policy for Academic Misconduct – All parties will get 0% marks CS 1150 – Lab 15 – Networking

  3. Lab # 15 Overview • Study how networks route packets to various destinations • Learn how networks ensure reliable delivery • Read all lab activities before attempting exercises • Answer all questions in Exercises 1, 2, 4 and 5 • Lab #15 Due Date - Nov 22, 2013 12:30 PM CS 1150 – Lab 15 – Networking

  4. How to Submit Lab # 15 • Hard copy (Preferred) • When you complete, hand it over to me • Pilot • Go to Pilot Course Page and Use Dropbox Submission Link to upload your files • My Mailbox at CS Department • Go to CS Department Front Desk and ask them to put your assignment into my mailbox – Please write my name on your assignment (TA – CS 1150 – Sanjaya Wijeratne) CS 1150 – Lab 15 – Networking

  5. What is a Computer Network? • Group of computers (2 or more) that are connected together to share data • Eg – Internet • Connections between computers in a network can be physical using cables/wires or wireless via radio waves CS 1150 – Lab 15 – Networking

  6. Network Protocols • Protocol is a set of rules that governs a particular task. A network protocol governs how computers communicate in a network. • TCP/IP • Transmission Control Protocol – Reliable Communication • IP – Addressing CS 1150 – Lab 15 – Networking

  7. Network Topology • Network Topology is the arrangement of different elements in a computer network. • Bus • Star • Ring Source – http://en.wikipedia.org/wiki/Network_topology CS 1150 – Lab 15 – Networking

  8. Routing in a Network • Each node in the network has a routing table • Routing table keeps track of • What are the other nodes directly connected to a given node • What routes to take if a node is not directly connected to the given node Source – http://en.wikipedia.org/wiki/Hop_(networking)#Next_hop_forwarding CS 1150 – Lab 15 – Networking

  9. TCP/IP Applet • TCP/IP applet simulates a reliable communication between two nodes (computers) in a network • DAT – Data packet • ACK – Acknowledgement that data was received without errors • NAK – Negative Acknowledgement which says there was an error in data receiving. CS 1150 – Lab 15 – Networking

  10. TCP/IP Applet Cont. • DAT10221 • 1 – Destination Address • 0 – Sequence Number • 221 – Checksum Data Packet CS 1150 – Lab 15 – Networking

  11. TCP/IP Applet Cont. • ACK010 • 0 – Destination Address • 1 – Sequence Number • 0 – Checksum ACK Packet CS 1150 – Lab 15 – Networking

  12. TCP/IP Applet Cont. • NAK010 • 0 – Destination Address • 1 – Sequence Number • 0 – Checksum NAK Packet CS 1150 – Lab 15 – Networking

  13. Exercise 1 – Q4 Help • DAT 0 x xxx / ACK 1 x xxx – Consider all DAT and ACK messages (headers) have 9 Characters • All DAK messages can carry up to 10 characters of data (payload) • Your answer to this question should be 160. Show me the steps to get marks. CS 1150 – Lab 15 – Networking

  14. Exercise 1 – Q5 Help • Use the following formula to calculate overhead • Total No. of Characters Exchanged – Total No. Characters in Message • x 100 • Total No. of Characters Exchanged CS 1150 – Lab 15 – Networking

  15. Exercise 1 – Q6 Help • How many DAT packets are needed to transfer 1,000,000 messages? (One DAT packet can carry 10 characters) • Each DAT packet will contain overhead of 9 characters per each message in addition to actual message content • Each ACK packet will contain overhead of 9 character and no message content CS 1150 – Lab 15 – Networking

  16. Exercise 2 Help CS 1150 – Lab 15 – Networking

  17. Additional Help • Networks (Chapter 15) Slides by Ms. Karen Meyer discussed in Class • Chapter 15 of Course Text Book – Communications Layer CS 1150 – Lab 15 – Networking

  18. Questions ? If you have questions, please raise your hand, Colin or myself will come to help you CS 1150 – Lab 15 – Networking

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