Lecture 01
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This document outlines the syllabus for the 15-744 Computer Networking course. It introduces the professor, TAs, and course objectives. The course will cover networking from the network layer to application layer, focusing on protocol rules, algorithms, and tradeoffs. Topics will include routing, transport, naming systems, and recent areas like multicast, mobility, and security. Assignments include problem sets, reading responses, a class project, and exams. The next lecture will discuss design considerations for splitting functionality across layers and nodes.
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Lecture 01
- 1. 15-744: Computer Networking L-1 Intro to Computer Networks
- 13. Types of Links Point-to-Point Multiple Access …
- 16. Back in the Old Days…
- 18. TDM Logical Network View
- 19. Packet Switching (Internet) Packets
- 25. Third Step: How To Find Nodes? Internet Computer 1 Computer 2
- 27. Domain Name System What’s the IP address for www.cmu.edu ? It is 128.2.11.43 DNS server address manually configured into OS Local DNS Server Computer 1
- 29. Network:Address Resolution Protocol Ethernet Broadcast: who knows the Ethernet address for 128.2.11.43 ? Ethernet Unicast: Yes, it is 08-00-2c-19-dc-45
- 30. Internetwork: Datagram Routing R R R R R H H H H R R H R Routers send packet to next closest point H: Hosts R: Routers
- 33. What if the Data gets Corrupted? Internet GET windex.html GET index.html Solution: Add a checksum Problem: Data Corruption 0,9 9 6,7,8 21 4,5 7 1,2,3 6 X
- 35. What if the Data gets Lost? Internet GET index.html Problem: Lost Data Internet GET index.html Solution: Timeout and Retransmit GET index.html GET index.html
- 37. What if the Data is Out of Order? Solution: Add Sequence Numbers Problem: Out of Order GET x.ht inde ml GET x.htindeml GET index.html ml 4 inde 2 x.ht 3 GET 1
- 42. Layering Host Host Application Transport Network Link User A User B Layering: technique to simplify complex systems
- 43. Layer Encapsulation Get index.html Connection ID Source/Destination Link Address User A User B
- 46. OSI Layers and Locations Switch Router Host Host Application Transport Network Data Link Presentation Session Physical
Notas do Editor
- Some example applications: video, audio, telnet, ftp, http, rpc – what are their needs
- For example: Ethernet
- 1-SUM[from n=0..9 of (35 chose n) * (.1^n) * (1-.1)^(40-n)
- What if want to communicate between hosts on different Ethernets? Internet as interoperability layer
- Human analogy – social customs