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Address Resolution Protocol (ARP). ▫ Question: how do packets actually get to their destination? ▫ IP routing tables: based on network addresses.
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ß What is the Internet, protocol?
ß network edge, core, access nets
ß physical media
ß delay, loss
ß layers, service models
ß Internet backbones, NAPs, ISPs
ß history
ß application-layer protocols ß the WWW: HTTP ß FTP ß email: SMTP, POP3, IMAP ß DNS ß Socket programming
ß introduction ß cryptography ß authentication ß integrity ß key distribution, certificates
ß secure email ß secure sockets ß IP sec ß 802.11 WEP
ß application requirements ß making the best of best-effort service ß scheduling, policing ß Integrated Services ß RSVP ß Differentiated Services
Q: Whither goest networking?
ß increasing link rates, but bandwidth not free in
near future
ß high bandwidth to home (ADSL, cable modems)
a major driver for future
ß security, management: critical concerns
ß agents: processing “in” or “on” the network in
support of end users
computing
