A network has an area where it is connected to the outside world, the Internet. Devices such as routers that have the capability of joining these two areas together and provide a connection, typically between the Internet and an organization or a connection between an ISP and the Internet.
A perimeter router would be apt for a small branch office or in a telecommuter's home, i.e. SOHO. This router would be the only 'line of defence' as there it would also be doing the filtering of outside traffic through the firewall feature so as the implement basic security on the network.
Internal routers; these are routers that provide direct connections to networks in the same area as them. These routers are usually present in network topologies of medium to large businesses in which greater routing options can be developed as the network is able to fully utilize the abilities of that router, as there would be an external router connecting to the Internet.
Firewall - A firewall is a device that segregates or joins an internal network and a DMZ. This device would be configured to prevent access from external users trying to 'intrude' on the internal network by blocking unsolicited access thereby providing a form of security for the users and the network itself.
source - 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/
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