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echo: bbs_internet
to: Bo Simonsen
from: Andy Ball
date: 2004-10-18 08:54:46
subject: Packet Vs Circuit Switch

Hello Bo,

  AB> Out-of-order packet reception springs to mind.

  BS> Hm. Please explain, not familear with that expression.

On a circuit-switched link (such as a dial-up call between my modem and
yours) all the data sent from my end to your end take the same route and
arrive in the same order that they were sent.  On a packet-switched network
(such as the Internet), it is possible for packets to take different routes
to reach you, and for a packet to arrive ahead of one that was sent before
it was (arriving out of order).

Thinking about it though, Telnet works over TCP which almost certainly
re-orders packets that it receives in the wrong order before passing them
up to Telnet, so although it's a valid difference between circuit-switched
and packet- switched networks, it's sort of irrelevent from Telnet's point
of view.  :-)

- Andy Ball

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