Question : Problem: What types of routing protocols would be the best in a situation where there are over 50 routers connecting multiple sites

This is a homework assignment so I an aware that I can only obtain a limited amount of information from anyone.  My objective is to determine what routing protocol I can suggest for an enterprise network of 50 routers connecting multiple sites.  Given this information, I will then have to provide the advantages and disadvantages along with the routing protocols which I have to offer several different types.  Once I have provided this information, I will need to provide a detailed solution so the administrator is more knowledgeable on the solution.

Answer : Problem: What types of routing protocols would be the best in a situation where there are over 50 routers connecting multiple sites

Assuming these are Cisco routers, check out ODR that does not have a limit on neighbors
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfodr.htm
Check out OSPF and its neighbor limitations:
http://www.cisco.com/warp/public/104/2.html
http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2003.htm
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