[jdev] ask a question

[Tomasz Sterna]

2005/8/7, zhangwm <zhangwm at netarchlab.tsinghua.edu.cn>:
> my question is that why did the writer say 'no multi-hop'. how did email
> deal with domain-based routing. would you please
> give me a example? thanks a lot !

Route of the e-mail message could be as simple as:
sender-host -> recipient-host
or there can be multiple relay servers on the route:
sender-host -> sender-isp -> relay1 -> relay2 -> ... -> recipient-isp
-> recipient-host
etc.

With Jabber/XMPP there is only one way the message travels:
sender-client -> sender-server -> recipient-server -> recipient-client
Of course sender-server and recipient-server could be the same, so
there is no server-to-server transmission involved.
But the point is, that there can be no relay servers in beetwen
sender-server and recipient-server - no 'multi-hop' (hop is a
transmission between two stops).

-- 
smk