Describe the similarity and differences in tunnel configuration when a mobile device is resident in its home network, versus when it is roaming in a visited network.

Answer:

When a mobile device is in the home network, the tunnel can be encrypted with VPN and can be used on public wifi as well. This is beneficial when there is a need to use outside the country services.

When a mobile device is outside the network, tunnel configuration is made to work for unsupported protocols as well across a number of networks.

The main similarity is in the way tunneling protocol helps in communicating and moving data between networks. For both the networks, a layered protocol is used with TCP/IP suite.