Routing versus forwarding.
Packet switching versus circuit switching (1).
Packet switching versus circuit switching (2).
How many calls can be carried?
What is the maximum number of connections that can be ongoing in the network at any one time?
[Note: you can find more questions like this one here.
Trying out traceroute.
Note: Routing may change, so the answer here may not be correct anymore. Also, if you are a Verizon user, there are known problems using traceroute with Verizon - if traceroute shows you two hops only to gaia.cs.umass.edu or any destination, skip this question.