Security Basics: inter-site WAN security question

[<nobledark () hushmail com>]

Hi,

1st post - I had a hypothetical question poised to me that I could 
not answer so I thought that I would ask the list. Here's the 
scenario:

 - Two sites, s1 and s2
 - s1 and s2 have the need for a bi-directional WAN link
 - The WAN link would be secured via a VPN and all traffic would be 
tunneled through the VPN
 - Both sites are connected via broadband links; s1 is on a cable 
modem and s2 utilizes a factional T-1.
 - There are 5 hops between s1 and s2.

Given this scenario, the question was, how anonymous can the 
connection be between these sites? Put a different way, assuming 
that s1 and s2 are secure and not under hacker control, how much of 
a threat is there of a 3rd party monitoring the traffic stream over 
the route between the sites and discovering that they are talking 
to each other?

Thanks....

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