You are planning to connect your three branch offices to the corporate site via Frame
Relay. The first branch office has been assigned the network 10.1.0.0/16, the second
10.2.0.0/16, the third 10.3.0.0/16, and the corporate headquarters uses 10.0.0.0/16. You
would like to summarize all branch and corporate networks into a single route at the
corporate site.
Which network address and subnet mask should you choose?