1. 1 Course Summary What have we learned: a huge amount! m principles m practice ….. using Internet to motivate examples

2. 2 Chapter 1: Introduction Our goal: r get “feel” and terminology r more depth, detail later in course r approach: m use Internet as example Overview: r what’s the Internet r what’s a protocol? r network edge r network core r access net, physical media r Internet/ISP structure r performance: loss, delay r protocol layers, service models r network modeling

3. 3 Chapter 2: Application Layer r conceptual, implementation aspects of network application protocols m transport-layer service models m client-server paradigm m peer-to-peer paradigm r learn about protocols by examining popular application-level protocols m HTTP m FTP m SMTP / POP3 / IMAP m DNS r web security r programming network applications m socket API

4. 4 Chapter 3: Transport Layer r understand principles behind transport layer services: m multiplexing/demultipl exing m reliable data transfer m flow control m congestion control r reliable multicast r learn about transport layer protocols in the Internet: m UDP: connectionless transport m TCP: connection-oriented transport m TCP congestion control

5. 5 Chapter 4: Network Layer r understand principles behind network layer services: m forwarding m routing (path selection) m dealing with scale m how a router works m advanced topics: IPv6 r instantiation in the Internet r broadcast, multicast routing

6. 6 Chapter 5: The Data Link Layer r understand principles behind data link layer services: m error detection, correction m sharing a broadcast channel: multiple access ALOHA (slotted and unslotted) Ethernet m link layer addressing r Ethernet hubs and switches r link virtualization, brief introduction to ATM, virtual circuits r did not cover – PPP (5.7), MPLS (5.8.2), DHCP (5.4.3), Manchester Encoding (Figure 5.25) r do not expect you to remember CRC details

7. 7 Chapter 6: Wireless & Mobile Networks Wireless r Wireless links, characteristics m CDMA r IEEE 802.11 wireless LANs (“wi-fi”) r Cellular Internet Access m architecture m standards (e.g., GSM) Mobility r Principles: addressing and routing to mobile users r Mobile IP r Handling mobility in cellular networks r Mobility and higher- layer protocols

8. 8 Chapter 8: Network Security r understand principles of network security: m cryptography and its many uses beyond “confidentiality” m authentication m message integrity m key distribution r security in practice: m firewalls m security in application, transport, network, link layers (WEP)

9. 9 Chapter 7:Multimedia Networking Principles r making the best of best effort service m dealing with delay jitter and loss r mechanisms for providing QoS m e.g., leaky bucket, weighted fair queuing Protocols and Architectures r specific protocols for best-effort m e.g., RTP/RTCP, SIP r architectures for QoS (IntServ, Diffserv) r did not cover 7.1.4, 7.2.1 – 7.2.3, 7.4.4, 7.5 (covered before mid-term), details of IntServ/Diffserv, Per-hop behavior, RSVP

10. 10 Networked Systems Wireless LAN Mobile Adhoc Network Public Switched Telephone Network Internet Gateway Sensor Network Home Network Cellular Access Network voice data

11. 11 Networking Applications r financial – stock trading, portfolio management r social – voice communication, email, chat, telecommuting r entertainment - games, music, video, surfing r medical – telemedicine r…r… r networked systems indispensable part of not just global communication infrastructure but our daily lives

12. 12 Q: Whither goest networking? A: nobody knows! General tends: r ubiquity of communications m IP dialtone, IP: like electricity: it’s everywhere! m network-capable appliances (e.g., IP toaster) m issues of scale important: 100's of millions of network- connected devices r mobility important: m people move, need to communicate r multimedia important: m it is how people communicate

13. 13 Q: Whither goest networking? r increasing link rates, but bandwidth not free in near future m increased # "users" m increased bandwidth requirements of enabled apps r high bandwidth to home (DSL, cable modems) a major driver for future m games, VR, education, information, entertainment m merger of networking and telephony m broadcast entertainment (TV) and WWW r security, reliability, management: critical concerns

14. 14 Our Very Last Note Page! r this course: m specific architectures, protocols m fundamental issues: APIs, reliable data transfer, flow/congestion control, routing, multiple access, addressing, security r remember: you learned it HERE!

15. 15 Final Exam on 12/13/06 8:00 AM to 9:30 AM r Four parts m Part 0 – Name and course number – 1 point m Part 1 - Multiple choice questions (A – D) [No None of the above choice] ~ 32 points m Part 2 – Short Answer Questions ~ 5 points m Part 3 – (extra credit for cs5480) ~ 3 points r Closed book closed notes r Post midterm material (however, expected to know important pre-midterm concepts)