DEFAULTIPSITELINK

Since our IT guy left a year ago I have been handling our IT department.  My knowledge is limited.  

Our setup consists of 5 locations each with 1 DC in each location.
They all run Server 2008 R2 exept 1 runs 2008.
Everything presently is working as should but 2 of our locations are in small towns with a max speed of 640k up/down.  They regularly complain that internet access will be slow (crawling) for 10-15 minutes then good for about an hour then slow again for 10-15 minutes. The worst site is actually a server 2008 R2 machine configured (hopefully correctly) as an RODC.

My question is that we have all our sites listed in one DEFAULTIPSITELINK.  And the old IT guy deleted the automatically generated sites under NTDS Settings for each site and manually created new connections to the faster DC's. Do the NTDS setting say which sites replicate with which or do the Site Link settings.

Would we not benefit from having multiple site links set up as follows:

A = Head Office / 10mb/10mb Connection
B and C = Secondary Offices / 1.5mb/1.5mb connection
D and E = Small Offices / 640kb/640kb connections

A - B
A - C
B - D
C - E

And in case 1 DC goes down also create the below with a higher cost
B - C
B - E
C - D

If I do create the new site links and delete the default is their anything else I have to do?
BHeshkaAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
you have different sites on different networks; create the sites as you had planned with the respective associated network and replication connections.  that should be fine

otherwise, keeping all domain controllers and networks in the same AD site will cause latency issues.  a client in site E might need a DC which it might find physically in site B since the AD site are the same and would be slow over the wan.  especially if you had exchange; you want a DC/GC that is close.  latency over the wan is not a good thing
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Seth SimmonsSr. Systems AdministratorCommented:
the replication partners seem fine; secondary ones at higher cost also
if it isn't already, would recommend site A hold the fsmo roles
make sure the subnets are assigned appropriately to each site
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BHeshkaAuthor Commented:
Thanks for your help Seth.
By saying replication partners seem fine, do you mean that I should change it to the above (instead of just one site link will all DC's in it)

Site A holds FSMO roles

Subnets are set up with each site having a 10.10.x.0/24
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BHeshkaAuthor Commented:
Thanks for you help
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