WAN Design Diagrams/Design tools?

Hi,

Pls assist me. I’m a final year degree student and
I have to complete an assignment which is to Design a WAN to interconnect major cities in France (11 Cities) . I have to design a WAN basicaly the design and costing only.I have to give three different solutions and reports. Pls tell me a free designing tool to get the diagrams and costing. I dont know where to start. pls assist me. Thanks a mil.

shahid07@gmail.com