CSE 123a Computer Networking
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1 CSE 123a Computer Networking Fall 2005 Final Review Stefan Savage
2 When/when/who? Tuesday 3:00-6:00 in this room I need to be giving a talk in Toronto so the final will be proctored by the TAs Fall, 2005 CSE 123a Final Review 2
3 Final Mechanics Will cover entire year of material (but with some bias to the material post-midterm) Based on lecture material, homeworks, textbook reading and project work Closed book, closed note, closed PDA, cell phone, etc You get one 8.5x11 sheet of notes (both sides is fine) Will be similar in style to midterm Fall, 2005 CSE 123a Final Review 3
4 Protocol Layering & Internetworking Why do we layer protocols? Pros/Cons? What are the layers and what functions do they serve? What layer do the protocols we ve studied fall into? What is Internetworking? What is it good for? What features does the IP protocol provide and why (and why not others?) What is the end-to-end principle and how you might use it when designing a set of protocols? Fall, 2005 CSE 123a Final Review 4
5 Physical layer Signaling Shannon s law (limits from noise) Nyquist limit (limits from sampling) Clock Recovery Asynchronous coding (e.g. start bit) Synchronous coding (e.g. NRZI, Manchester, 4B5B) Fall, 2005 CSE 123a Final Review 5
6 Data-link layer Framing Sentinel schemes Length based Clock-based Error detection codes Parity schemes, CRC Media Access Control Channel Partitioning (FDMA, TDMA, etc) Random access» Contention based (Aloha, CSMA, CSMA/CD)» Contention-free (RTS/CTS, Token Ring, Polling) Special issues for wireless Fall, 2005 CSE 123a Final Review 6
7 Bridges & switching Repeaters/Hubs Learning bridges Spanning tree protocol Fall, 2005 CSE 123a Final Review 7
8 Reliable communications What is the difference between ARQ and FEC? How does ARQ work? How to detect delayed or duplicated packets? How to detect lost packets? What are Stop and wait and sliding window? How does the window size impact throughput? How to implement each? How does flow control work in sliding window protocols? Fall, 2005 CSE 123a Final Review 8
9 Connections How to differentiate packets belonging to different sessions? (distinct conversations between pairs of processes) Connection-oriented vs connection-less protocols Usefulness of each? How to establish a reliable connection? How to tear down a reliable connection? How do you use state machines to implement this? How do TCP and UDP work wrt these issues? Fall, 2005 CSE 123a Final Review 9
10 Congestion Control How does queuing work? How is congestion caused? What techniques can be used to reduce/manage congestion? How to detect congestion? How to respond to it? How does TCP congestion control work? Slow start? Congestion Avoidance? Fast retransmission and fast recovery? What assumptions are being made in these protcols? Fall, 2005 CSE 123a Final Review 10
11 Packet Forwarding IP addressing & use DHCP Destination lookup Router design issues Fall, 2005 CSE 123a Final Review 11
12 Intra-domain Routing What purpose does routing serve? What are the pros/cons of destination-based routing? What is the difference between routing and forwarding? How does Distance Vector Routing work? Poison reverse and split horizon? How does Link State Routing work? What is in a link-state packet? Reliable Flooding? Shortest-Path algorithm? Fall, 2005 CSE 123a Final Review 12
13 Inter-domain routing Why are inter and intra-domain routing different? What is a path vector protocol? Why is it appropriate for inter-domain routing? How is BGP used to enforce routing policies? Routing policies? What is peering vs transit? Why do they exist? Fall, 2005 CSE 123a Final Review 13
14 Multicast What is it? How does it work in a local-area network (IGMP)? Shared tree vs source-based tree (pros/cons) How does RPM work? How does tunneling work? Fall, 2005 CSE 123a Final Review 14
15 QoS Integrated Services Why? Kinds of services offered RSVP design Token bucket mechanism Scaling issues Differentiated services Advantages vs IntServ Difference in service guarantees Fall, 2005 CSE 123a Final Review 15
16 Questions? Fall, 2005 CSE 123a Final Review 16
17 Quick admin stuff Project 1 Max = 100, Mean 86, Std Dev=20, Median = 96 HW 2 Max = 20, Mean = 17.59, Std Dev=2.1, Median = 18 Fall, 2005 CSE 123a Final Review 17
18 Thanks and good luck You are now ready to cause problems on the Internet Fall, 2005 CSE 123a Final Review 18
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