What is a Perimeter Router? It is a standard router that provides a serials connection to the internet. It is also a LAN connection to the internal network. To be able to implement basic security for the Demilitarised Zone (DMZ) and implement preliminary filtering for the internal network, the perimeter router should provide filtering of the outside traffic. As an additional security option, the router could run the firewall feature.
Diagram 1
Internal Router
What is a Internal Router? It is a router that has Open Shortest Path First (OSPF) neighbor relationships with interfaces within the same area. In a single area, it has all its interfaces.
Firewall
What is a firewall? It is a set of related programs that protects the resources of a private network from users from other networks. It is located at a network gateway servers. A firewall examines each network packet, determining whether it can be forwarded towards its destination or not. Firewalls works with a proxy server that can make network requests on behalf of workstation users. In a specially designed computer separate from the rest of the network, a firewall is often installed so no incoming requests will be able to get directly at the private network resources.
Diagram 2
Reference:
http://etutorials.org/Networking/Cisco+Certified+Security+Professional+Certification/Part+II+Securing+the+Network+Perimeter/Chapter+5+Securing+Cisco+Perimeter+Routers/Perimeter+Router+Terms+and+Concepts/http://searchsecurity.techtarget.com/definition/firewall
Diagram 1:
http://etutorials.org/shared/images/tutorials/tutorial_56/15fig01.gif
Diagram 2:
http://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Firewall.png/300px-Firewall.png
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