EECS122 – Lecture 2 Department of Electrical Engineering and Computer Sciences University of California Berkeley TOC : Applications/Design Web Browsing Telephone Call Multiplexing Protocols IETF Applications : Web Browsing Example Locating Resource: DNS Connection End-to-end Packets
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Department of Electrical Engineering and Computer Sciences
University of California
Computer (server) selects
contents based on string
Circuit = capacity to carry one phone call (shown by thin lines)
Circuit is allocated to the call between A and B
Circuits are not shared; they are dedicated.
Voice signals use the reserved circuits
A or B goes Off-Hook
Circuits get released
how to achieve controlled sharing
rate r bps
1 link, rate nr bps
Time “slots” are reserved
bps = bits per second
1 link, any rate
Variable-sized “packets” of data are interleaved
based on the statistics of the senders
We reject kings, presidents and voting.
We believe in rough consensus and running code.
--- David Clark