BGP Task Interpretation - would they be this anal?

From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Sun Dec 16 2007 - 10:31:14 ART

Lets say you have two AS's connected via non-BGP speaking routers like this:

   R1 <--AS1
  / \
R2 R3 <-- Non-BGP
 | |
R4--R5 <--AS2

Task states to configure AS2 to influence AS1 to prefer the BGP path to R4
for certain networks and R5 for other networks.
I know there are many ways to do this i.e MED, AS path prepend, summary,
filter, etc..

My question is it enough for AS1 to see the correct path in the BGP table or
do you need to take steps to ensure the non-bgp speakers are taking that
preferred path as well? I already have BGP redistributing into IGP so R2 and
R3 have the routes in their routing table, I'm just not sure if I should
waste time tweaking metrics to force them to route via that same preferred
path?

Would the graders be so anal to make sure each router in the path was
following the preferred path or would they simply check the BGP table on AS1
to make sure the path was preferred there?

Thanks in advance,
Nick

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